The Alpha Geek – Geeking Out

Digital Electronics

Digital Electronics

Project #9: Stepper – Mk01

Stepper Motor

A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor’s position can then be commanded to move and hold at one of these steps without any position sensor for feedback (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed.

Switched reluctance motors are very large stepping motors with a reduced pole count, and generally are closed-loop commutated.

Fundamentals of Operation

Brushed DC motors rotate continuously when DC voltage is applied to their terminals. The stepper motor is known by its property to convert a train of input pulses (typically square wave pulses) into a precisely defined increment in the shaft position. Each pulse moves the shaft through a fixed angle.

Stepper motors effectively have multiple “toothed” electromagnets arranged around a central gear-shaped piece of iron. The electromagnets are energized by an external driver circuit or a micro controller. To make the motor shaft turn, first, one electromagnet is given power, which magnetically attracts the gear’s teeth. When the gear’s teeth are aligned to the first electromagnet, they are slightly offset from the next electromagnet. This means that when the next electromagnet is turned on and the first is turned off, the gear rotates slightly to align with the next one. From there the process is repeated. Each of those rotations is called a “step”, with an integer number of steps making a full rotation. In that way, the motor can be turned by a precise angle.

Unipolar Motors

A unipolar stepper motor has one winding with center tap per phase. Each section of windings is switched on for each direction of magnetic field. Since in this arrangement a magnetic pole can be reversed without switching the direction of current, the commutation circuit can be made very simple (e.g., a single transistor) for each winding. Typically, given a phase, the center tap of each winding is made common: giving three leads per phase and six leads for a typical two phase motor. Often, these two phase commons are internally joined, so the motor has only five leads.

Bipolar Motors

Bipolar motors have a single winding per phase. The current in a winding needs to be reversed in order to reverse a magnetic pole, so the driving circuit must be more complicated, typically with an H-bridge arrangement (however there are several off-the-shelf driver chips available to make this a simple affair). There are two leads per phase, none are common.

Small Stepper Motor

Description

These small steppers are a great way to get things moving, especially when positioning and repeatability is a concern.

When using a current limiting driver such as the Easydriver or Big Easydriver, a 12 volt power supply can be used as long as you adjust the current level to 400mA or less. If using a non current limited driver (like a L293D or an H-bridge) you will need to lower your input voltage to keep the motor current below 400mA.

This is a bipolar motor.

Features

* Stride Angle (degrees): 7.5
* 2-Phase
* Rated Voltage: 12V
* Rated Current: 400mA
* 3mm Diameter Drive Shaft
* 4-Wire Cable Attached
* In-traction Torque: 100 g/cm

Don Luc

Project #8: Servo – Potentiometer Servo – Mk01

Servo Motor

A servo motor is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servo motors.

Servo motors have been around for a long time and are utilized in many applications. They are small in size but pack a big punch and are very energy-efficient. These features allow them to be used to operate remote-controlled or radio-controlled toy cars, robots and airplanes. Servo motors are also used in industrial applications, robotics, in-line manufacturing, pharmaceutics and food services.

Circuit

Servo motors have three wires: power, ground, and signal. The power wire is red, and should be connected to the 5V pin on the Arduino board. The ground wire is black and should be connected to a ground pin on the board. The signal pin is orange and should be connected to pin 9 on the board.

The potentiometer should be wired so that its two outer pins are connected to power (+5V) and ground, and its middle pin is connected to analog input 0 on the board.

DonLuc1805Mk07

1 x RGB LCD Shield 16×2 Character Display
1 x Arduino UNO – R3
1 x ProtoScrewShield
1 x Servo Motor
1 x 100k Ohm Potentiometer
1 x Potentiometer Knob
4 x Jumper Wires 3″ M/M
4 x Jumper Wires 6″ M/M
1 x Half-Size Breadboard

Arduino UNO

Ser – Digital 9
Pot – Analog A0
VIN – +5V
GND – GND

DonLuc1807Mk03.ino

// ***** Don Luc *****
// Software Version Information
// Project #8: Servo Motor - Potentiometer - Mk01
// 7-3
// DonLuc1807Mk03 7-3
// Servo Motor
// Potentiometer Servo

// include the library code:
#include <Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>
#include <Servo.h>

Adafruit_RGBLCDShield RGBLCDShield = Adafruit_RGBLCDShield();
#define GREEN 0x2

// Potentiometer Servo Motor
Servo isServo;                            // Create servo object to control a servo
int iPot1 = A0;                           // Analog Potentiometer 1
int iVal;                                 // Variable - Analog Potentiometer 1

void loop() {

  // Potentiometer Servo Motor
  iVal = analogRead(iPot1);               // Reads the value of the iPot1 (Value between 0 and 1023)
  iVal = map(iVal, 0, 1023, 0, 180);      // Scale it to use it with the isServo (Value between 0 and 180)
  isServo.write(iVal);                    // isServo sets the servo position according to the scaled value
  delay(15);    

  // Display
  // Set the cursor to column 0, line 0  
  RGBLCDShield.setCursor(0,0);
  RGBLCDShield.print("Potentiometer");     // Potentiometer
  // Set the cursor to column 0, line 1
  RGBLCDShield.setCursor(0, 1);
  RGBLCDShield.print(iVal);                // Reads the value iVal
  
  delay(500);
  
  // Clear
  RGBLCDShield.clear();
  
}

setup.ino

// Setup
void setup() {

  // set up the LCD's number of columns and rows: 
  RGBLCDShield.begin(16, 2);
  RGBLCDShield.setBacklight(GREEN);
  
  // Display
  // Set the cursor to column 0, line 0  
  RGBLCDShield.setCursor(0,0);  
  RGBLCDShield.print("Don Luc");         // Don luc
  // Set the cursor to column 0, line 1
  RGBLCDShield.setCursor(0, 1);
  RGBLCDShield.print("Potentiometer");   // Potentiometer Servo Motor

  delay(5000);

  // Clear
  RGBLCDShield.clear();

  // Potentiometer Servo Motor
  isServo.attach(9);                     // Attaches the Servo on pin 9 to the Servo Object

}

Don Luc

555 LED Flasher

Don Luc

In my early teens I was into photography and processing and printing my own B&W photos in a darkroom I had built with the help of my Mom in our basement in Canada. I got into electronics when I could not afford to buy a proper darkroom timer and I saw some article, probably in some electronics magazine, that explained how to build a simple timer that blinks a LED at one second intervals. After a trip, probably to Radio Shack, to buy a 555 timer IC, a LED, some resistors, wires and a small perforated circuit board. After that I was hooked on electronics projects from that day.

555 Timer IC

The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications. The 555 can be used to provide time delays, as an oscillator, and as a flip-flop element.

Introduced in 1972 by Signetics, the 555 is still in widespread use due to its low price, ease of use, and stability. It is now made by many companies in the original bipolar and in low-power CMOS technologies. As of 2003, it was estimated that 1 billion units were manufactured every year. The 555 is the most popular integrated circuit ever manufactured. This is a small size led flasher built with the 555 timer IC that is powered from DC Power Supply. The circuit can be used as a flashing metronome, dark room timer, memo-reminder or other similar applications.

Specifications

These specifications apply to the NE555. Other 555 timers can have different specifications depending on the grade (military, medical, etc.). These values should be considered “ball park” values, instead the current official datasheet from the exact manufacturer of each chip should be consulted for parameter limitation recommendations.

Supply voltage (VCC): 4.5 to 15 V
Supply current (VCC = +5 V): 3 to 6 mA
Supply current (VCC = +15 V): 10 to 15 mA
Output current (maximum): 200 mA
Maximum Power dissipation: 600 mW
Power consumption (minimum operating): 30 mW@5V, 225 mW@15V
Operating temperature: 0 to 75 °C

555 Flasher Circuit

Modes: Astable (free-running) mode – the 555 can operate as an electronic oscillator. Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse position modulation and so on. The 555 can be used as a simple ADC, converting an analog value to a pulse length. The use of a microprocessor-based circuit can then convert the pulse period to temperature, linearize it and even provide calibration means.

The LED will be ON for a short period of time and OFF for a longer period. The duty cycle can be reversed if the LED is connected as shown will also increase due to the fact that the LED will stay ON for a longer period of time. An LED flasher circuit is a circuit which flashes the LED meaning turns it ON-OFF, ON-OFF, ON-OFF, Etc.

555 LED Flasher

1 x 555 Timer IC
1 x DC Power Supply
1 x Red LED
2 x 1K Ohm Resistors
1 x 10K Ohm Resistor
1 x 10µF Electrolytic Capacitor
1 x 0.01µF Ceramic Capacitor
9 x Jumper Wires 3″ M/M
1 x Breadboard

Don Luc

Project #6: MicroView – Alcohol Gas Sensor – Mk09

Alcohol Gas Sensor – MQ-3

This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC.

Features

* 5V DC or AC circuit
* Requires heater voltage
* Operation Temperature: -10 to 70 degrees C
* Heater consumption: less than 750mW* 16.8mm diameter
* 9.3 mm height without the pins

Note: Again, the MQ-3 is heater-driven so be aware that the sensor will become warm and may even emit a smell at first. This is completely normal.

Calibration: If you take your time, you can find out what values equate to specific percentages or even blood alcohol concentration in the case of a breathalyzer. You will of course need to calibrate your MQ-3 based on your specific Arduino code since sensor readings will vary. Do not get the sensor wet with alcohol! Simply squeeze to breathe the vapors of the alcohol into the sensor and take your readings.

Alcohol Gas Sensor – MQ-3

1 x MicroView
1 x MicroView – USB Programmer
1 x Alcohol Gas Sensor – MQ-3
1 x NeoPixel Stick – 8 x 5050 RGB LED
1 x LED Green
1 x 10k Ohm
1 x 100k Ohm Potentiometer
1 x Potentiometer Knob
1 x 4 Header
2 x 2 Header
14 x Jumper Wires 3″ M/M
1 x Half-Size Breadboard
1 x Battery Holder 3xAAA with Cover and Switch
3 x Battery AAA

MicroView

Pot – PIN 05 – Analog A2
MQ-3 – PIN 07 – Analog A0
GND – PIN 08 – GND
VIN – PIN 15 – +5V
NEO – PIN 12 – Digital 3
LEDG – PIN 11 – Digital 2

DonLuc1807Mk01

DonLuc1807Mk01.ino

// ***** Don Luc *****
// Software Version Information
// Project #6: MicroView - Alcohol Gas Sensor - MQ-3 - Mk09
// 7.1
// DonLuc1807Mk01 7-1
// MicroView
// Alcohol Gas Sensor - MQ-3

// include the library code:
#include <MicroView.h>
#include <Adafruit_NeoPixel.h>

// Alcohol Gas Sensor - MQ-3
int mq3Pin0 = A0;                         // Connected to the output pin of MQ3 
int mq3Value = 0;

// NeoPixels
#define PIN 3                             // On digital pin 3
#define NUMPIXELS 8                       // NeoPixels NUMPIXELS = 8
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
int red = 0;                              // Red
int green = 0;                            // Green
int blue = 0;                             // Blue
int iNeo = 0;                             // Neopix
const int iBriPin = A2;                   // Panel Mount 1K potentiometer Brightneed
int iBri = 0;                             // Neopix Brightness
int iBriMin = 1023;                       // Brightneed minimum sensor value
int iBriMax = 0;                          // Brightneed maximum sensor value

// LED
int ledG = 1;                             // LED Green

void loop() {
  
  // Alcohol Gas Sensor - MQ-3
  // Give ample warmup time for readings to stabilize
  isMQ3();

  delay(100);
  
  uView.clear(PAGE);  // Erase the memory buffer, the OLED will be cleared
  
}

getMQ3.ino

// Alcohol Gas Sensor - MQ-3
void isMQ3(){

  // LEDs - Low
  for(int z=0; z<NUMPIXELS; z++){ 
     // Black
     red = 0;                                 // Red
     green = 0;                               // Green
     blue = 0;                                // Blue
     iNeo = z;                                // Neopix       
     neopix(); 
  }
    
  // Probe
  mq3Value = analogRead(mq3Pin0);              // Take a reading from the probe
  
  if( mq3Value >= 1 ){                         // If the reading isn't zero, proceed
    
    if (mq3Value > 1){                         // If the average is over 50 ...
      // Green
      red = 0;                                 // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 0;                                // Neopix       
      neopix();      
    }
    else{                                      // and if it's not ...
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 0;                                // Neopix        
      neopix();      
    }

    if (mq3Value > 250){                        // and so on ...
      // Green
      red = 0;                                 // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 1;                                // Neopix       
      neopix();
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 1;                                // Neopix        
      neopix(); 
    }

    if (mq3Value > 350){
      // Green
      red = 0;                                 // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 2;                                // Neopix       
      neopix();
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 1;                                // Neopix        
      neopix(); 
    }


    if (mq3Value > 500){
      // Yellow
      red = 255;                               // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 3;                                // Neopix
      neopix();
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 3;                                // Neopix       
      neopix(); 
    }

    if (mq3Value > 650){
      // Yellow
      red = 255;                               // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 4;                                // Neopix      
      neopix();
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 4;                                // Neopix        
      neopix(); 
    }

    if (mq3Value > 750){
      // Yellow
      red = 255;                               // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 5;                                // Neopix  
      neopix();
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 5;                                // Neopix        
      neopix(); 
    }

    if (mq3Value > 850){
      // Red
      red = 255;                               // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 6;                                // Neopix       
      neopix();
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 6;                                // Neopix       
      neopix();
    }

    if (mq3Value > 950){
      // Red
      red = 255;                               // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 7;                                // Neopix      
      neopix();
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 7;                                // Neopix        
      neopix();
    }

  }
  
  uView.setFontType(0);  // Set font type 0: Numbers and letters. 10 characters per line (6 lines)

  uView.setCursor(0,10); // Alcohol Gas Sensor
  uView.print( "Alcohol" );
  uView.setCursor(0,30); // Alcohol Gas Sensor
  uView.print( mq3Value ); 
        
  uView.display();       // Display
   
}

neopix.ino

// Neopix
void neopix() { 

    // Brightness
    iBri = analogRead(iBriPin);

    // iBri apply the calibration to the sensor reading
    iBri = map(iBri, iBriMin, iBriMax, 0, 255);

    // iBri in case the sensor value is outside the range seen during calibration
    iBri = constrain(iBri, 0, 255);  
    
    pixels.setBrightness( iBri );
    // Pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor( iNeo, pixels.Color(red,green,blue) ); 
    // This sends the updated pixel color to the hardware
    pixels.show(); 
    // Delay for a period of time (in milliseconds)
    delay(50);     
  
}

setup.ino

// Setup
void setup() {

  uView.begin();           // Begin of MicroView
  uView.clear(ALL);        // Erase hardware memory inside the OLED controller
  uView.display();         // Display the content in the buffer memory, by default it is the MicroView logo
  
  delay(1000);
  
  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared.
   
  uView.setFontType(1);    // Set font type 1: Numbers and letters. 7 characters per line (3 lines)
  uView.setCursor(0,20);
  uView.print("Don Luc");  // Don Luc
  uView.display();         // Display
  
  delay(5000);

  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared.

  uView.setFontType(1);    // Set font type 1: Numbers and letters. 7 characters per line (3 lines)
  uView.setCursor(0,20);
  uView.print("MQ-3");     // Alcohol Gas Sensor - MQ-3
  uView.display();         // Display 
  
  delay(5000);
  
  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared

  // NeoPixels
  pixels.begin();          // This initializes the NeoPixel library

  // LED
  pinMode( ledG, OUTPUT ); // LED Green 
  // LED Green - High 
  digitalWrite( ledG, HIGH);
       
}

Don Luc

LED – Infrared 950nm

Infrared LEDs are used for remote controls and ‘night-vision’ cameras, and these little blue guys are high powered ones. They are 950nm wavelength, which is what nearly all devices listen to.

The IR LED (or infrared light-emitting diode) Bit sends out light with longer wavelengths than visible light, similar to the light in your remote control. It’s invisible to the eye, but many digital cameras can see it. Try using it to activate the light sensor or remote trigger.

In short, LEDs are like tiny lightbulbs. However, LEDs require a lot less power to light up by comparison. They’re also more energy efficient, so they don’t tend to get hot like conventional lightbulbs do (unless you’re really pumping power into them). This makes them ideal for mobile devices and other low-power applications.

Technical Details

* 5mm LED
* 950nm wavelength (most common)
* 20 degree beam width

LED – Infrared 950nm

5 x Powerful IR LEDs GP54
5 x 30 Ohm
1 x Battery Holder 2xAAA with Cover and Switch
2 x Battery AAA
1 x Half-Size Breadboard
5 x Jumper Wires 3″ M/M

Don Luc

Raspberry Pi NoIR Camera V2.1

The infrared Camera Module v2 (Pi NoIR) has a Sony IMX219 8-megapixel sensor custom designed add-on board for Raspberry Pi, featuring a fixed focus lens. It’s capable of 3280 x 2464 pixel static images, and also support 1080p30, 720p60, and 640x480p60/90 video. The Pi NoIR gives you everything the regular Camera Module offers, with one difference: it does not employ an infrared filter. This means that pictures you take by daylight will look decidedly curious, but it gives you the ability to see in the dark with infrared lighting.

We bundle a little square of blue gel with the Pi NoIR “night vision”, which you can use with the camera to monitor the health of green plants. The Pi NoIR is very popular among wildlife hobbyists: with a few infrared LEDs, you can monitor what nocturnal animals are doing in your garden without disturbing them. It attaches to the Pi by way of one of the small sockets on the board’s upper surface and uses the dedicated CSi interface, designed especially for interfacing to cameras. The NoIR Camera has No InfraRed (NoIR) filter on the lens which makes it perfect for doing Infrared photography and taking pictures in low light (twilight) environments.

Features

Improved Resolution

* 8 megapixel native resolution high quality Sony IMX219 image sensor
* Cameras are capable of 3280 x 2464 pixel static images

Remaining High Quality

* Capture video at 1080p30, 720p60 and 640x480p90 resolutions
* All software is supported within the latest version of Raspbian Operating System
* No Infrared filter making it perfect for taking Infrared photographs or photographing objects in low light (twilight) conditions
* 1.4 µm X 1.4 µm pixel with OmniBSI technology for high performance (high sensitivity, low crosstalk, low noise)
* Optical size of 1/4″

Technical Details

Dimensions: 25mm x 23mm x 9mm / 0.98″ x 0.90″ x 0.35″
Weight (camera board + attached cable): 3.4g

1 x Raspberry Pi NoIR Camera V2.1
1 x Filter
1 x Camera Cable
1 x Raspberry Pi 3 – Model B
1 x MicroSD 16 GB
1 x 5V 2A Switching Power Supply

Don Luc

Project #6: MicroView – EMF Meter (Single Axis) – Mk08

Electromagnetic Field

An electromagnetic field (also EMF or EM field) is a physical field produced by electrically charged objects. It affects the behavior of charged objects in the vicinity of the field. The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. It is one of the four fundamental forces of nature (the others are gravitation, weak interaction and strong interaction).

The field can be viewed as the combination of an electric field and a magnetic field. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. The way in which charges and currents interact with the electromagnetic field is described by Maxwell’s equations and the Lorentz force law. The force created by the electric field is much stronger than the force created by the magnetic field.

From a classical perspective in the history of electromagnetism, the electromagnetic field can be regarded as a smooth, continuous field, propagated in a wavelike manner; whereas from the perspective of quantum field theory, the field is seen as quantized, being composed of individual particles.

EMF Measurement

EMF measurements are measurements of ambient (surrounding) electromagnetic fields that are performed using particular sensors or probes, such as EMF meters. These probes can be generally considered as antennas although with different characteristics. In fact probes should not perturb the electromagnetic field and must prevent coupling and reflection as much as possible in order to obtain precise results. There are two main types of EMF measurements:

* Broadband measurements performed using a broadband probe, that is a device which senses any signal across a wide range of frequencies and is usually made with three independent diode detectors;
* Frequency selective measurements in which the measurement system consists of a field antenna and a frequency selective receiver or spectrum analyzer allowing to monitor the frequency range of interest.

EMF probes may respond to fields only on one axis, or may be tri-axial, showing components of the field in three directions at once. Amplified, active, probes can improve measurement precision and sensitivity but their active components may limit their speed of response.

EMF Meters

An EMF meter is a scientific instrument for measuring electromagnetic fields (abbreviated as EMF). Most meters measure the electromagnetic radiation flux density (DC fields) or the change in an electromagnetic field over time (AC fields), essentially the same as a radio antenna, but with quite different detection characteristics.

The two largest categories are single axis and tri-axis. Single axis meters are cheaper than tri-axis meters, but take longer to complete a survey because the meter only measures one dimension of the field. Single axis instruments have to be tilted and turned on all three axes to obtain a full measurement. A tri-axis meter measures all three axes simultaneously, but these models tend to be more expensive.

Electromagnetic fields can be generated by AC or DC currents. An EMF meter can measure AC electromagnetic fields, which are usually emitted from man-made sources such as electrical wiring, while gaussmeters or magnetometers measure DC fields, which occur naturally in Earth’s geomagnetic field and are emitted from other sources where direct current is present.

EMF Meter (Single Axis)

1 x MicroView
1 x MicroView – USB Programmer
1 x DS18S20
1 x NeoPixel Stick – 8 x 5050 RGB LED
1 x Speaker
1 x LED Red
1 x LED Green
1 x LED Yellow
1 x 330 Ohm
1 x 1.5k Ohm
1 x 3.3M Ohm
1 x 3″ Wire Solid Core, 22 AWG
1 x 4 Header
20 x Jumper Wires 3″ M/M
1 x Half-Size Breadboard
1 x Battery Holder 3xAAA with Cover and Switch
3 x Battery AAA

MicroView

WIRE – PIN 02 – Analog A5
GND – PIN 08 – GND
VIN – PIN 15 – +5V
TEM – PIN 14 – Digital 5
SPE – PIN 13 – Digital 4
NEO – PIN 12 – Digital 3
LEDG – PIN 11 – Digital 2
LEDY – PIN 10 – Digital 1
LEDR – PIN 09 – Digital 0

DonLuc1806Mk01

DonLuc1806Mk01a.ino

// ***** Don Luc *****
// Software Version Information
// Project #6: MicroView - EMF Meter (Single Axis) - Mk08
// 6.1
// DonLuc1806Mk01 6-1
// MicroView
// EMF Meter (Single Axis)

// include the library code:
#include <MicroView.h>
#include <Adafruit_NeoPixel.h>
// Pitches
#include "pitches.h"
#include <OneWire.h>

// EMF Meter (Single Axis)
#define NUMREADINGS 15                    // Raise this number to increase data smoothing
int senseLimit = 15;                      // Raise this number to decrease sensitivity (up to 1023 max)
int val = 0;                              // Val
int iEMF = A5;                            // EMF Meter
int readings[ NUMREADINGS ];              // Readings from the analog input
int index = 0;                            // Index of the current reading
int total = 0;                            // Running total
int average = 0;                          // Final average of the probe reading
// NeoPixels
#define PIN 3                             // On digital pin 3
#define NUMPIXELS 8                       // NeoPixels NUMPIXELS = 8
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
int red = 0;                              // Red
int green = 0;                            // Green
int blue = 0;                             // Blue
int iNeo = 0;                             // Neopix
int iBri = 0;                             // Neopix Brightness
// LED
int ledR = 0;                             // LED Red
int ledG = 1;                             // LED Green
int ledY = 2;                             // LED Yellow
// 8-ohm speaker
#define tonePIN 5                         // On digital pin 5
// Temperature chip i/o
int DS18S20_Pin = 6;                      // DS18S20 Signal pin on digital 6
OneWire ds(DS18S20_Pin);                  // On digital pin 6
float temperature = 0;                    // Temperature

void loop() {
  
  // EMF Meter (Single Axis)
  isEMF();

  delay(250);
  
  uView.clear(PAGE);  // Erase the memory buffer, the OLED will be cleared
  
}

getEMF.ino

// EMF Meter (Single Axis)
void isEMF(){

  // LEDs - Low
  for(int z=0; z<NUMPIXELS; z++){ 
     // Black
     red = 0;                                 // Red
     green = 0;                               // Green
     blue = 0;                                // Blue
     iNeo = z;                                // Neopix
     iBri = 0;                                // Neopix Brightness        
     neopix(); 
  }
  digitalWrite(ledG, LOW);                    // Turn that LED off
  digitalWrite(ledY, LOW);                    // Turn that LED off  
  noTone(tonePIN);                            // noTone
    
  // Probe
  val = analogRead( iEMF );                    // Take a reading from the probe
  
  if( val >= 1 ){                              // If the reading isn't zero, proceed

    val = constrain( val, 1, senseLimit );     // Turn any reading higher than the senseLimit value into the senseLimit value
    val = map( val, 1, senseLimit, 1, 1023 );  // Remap the constrained value within a 1 to 1023 range

    total -= readings[ index ];                // Subtract the last reading
    readings[ index ] = val;                   // Read from the sensor
    total += readings[ index ];                // Add the reading to the total
    index = ( index + 1 );                     // Advance to the next index

    if ( index >= NUMREADINGS ) {              // If we're at the end of the array...
      index = 0;                               // ...wrap around to the beginning
    }  

    average = total / NUMREADINGS;             // Calculate the average

    if (average < 50) {                        // If the average is less 50 ...
      digitalWrite(ledG, HIGH);                // turn that LED On  
      tone(tonePIN, NOTE_C3);                  // Tone         
    }
    else{                                      // and if it's not ...
      digitalWrite(ledG, LOW);                 // turn that LED off
      noTone(tonePIN);                         // noTone
    }
    
    if (average > 50){                         // If the average is over 50 ...
      // Green
      red = 0;                                 // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 0;                                // Neopix
      iBri = 100;                              // Neopix Brightness        
      neopix();      
      tone(tonePIN, NOTE_C4);                  // Tone
    }
    else{                                      // and if it's not ...
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 0;                                // Neopix
      iBri = 0;                                // Neopix Brightness        
      neopix();      
      noTone(tonePIN);                         // noTone
    }

    if (average > 250){                        // and so on ...
      // Green
      red = 0;                                 // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 1;                                // Neopix
      iBri = 100;                              // Neopix Brightness        
      neopix();
      tone(tonePIN, NOTE_D4);                  // Tone
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 1;                                // Neopix
      iBri = 0;                                // Neopix Brightness        
      neopix(); 
      noTone(tonePIN);                         // noTone
    }

    if (average > 350){
      // Green
      red = 0;                                 // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 2;                                // Neopix
      iBri = 100;                              // Neopix Brightness        
      neopix();
      tone(tonePIN, NOTE_E4);                  // Tone
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 1;                                // Neopix
      iBri = 0;                                // Neopix Brightness        
      neopix(); 
      noTone(tonePIN);                         // noTone
    }


    if (average > 500){
      // Yellow
      red = 255;                               // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 3;                                // Neopix
      iBri = 100;                              // Neopix Brightness        
      neopix();
      tone(tonePIN, NOTE_F4);                  // Tone
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 3;                                // Neopix
      iBri = 0;                                // Neopix Brightness        
      neopix(); 
      noTone(tonePIN);                         // noTone
    }

    if (average > 650){
      // Yellow
      red = 255;                               // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 4;                                // Neopix
      iBri = 100;                              // Neopix Brightness        
      neopix();
      tone(tonePIN, NOTE_G4);                  // Tone
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 4;                                // Neopix
      iBri = 0;                                // Neopix Brightness        
      neopix(); 
      noTone(tonePIN);                         // noTone
    }

    if (average > 750){
      // Yellow
      red = 255;                               // Red
      green = 255;                             // Green
      blue = 0;                                // Blue
      iNeo = 5;                                // Neopix
      iBri = 100;                              // Neopix Brightness        
      neopix();
      tone(tonePIN, NOTE_A4);                  // Tone
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 5;                                // Neopix
      iBri = 0;                                // Neopix Brightness        
      neopix();
      noTone(tonePIN);                         // noTone 
    }

    if (average > 850){
      // Red
      red = 255;                               // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 6;                                // Neopix
      iBri = 100;                              // Neopix Brightness        
      neopix();
      tone(tonePIN, NOTE_B4);                  // Tone
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 6;                                // Neopix
      iBri = 0;                                // Neopix Brightness        
      neopix();
      noTone(tonePIN);                         // noTone 
    }

    if (average > 950){
      // Red
      red = 255;                               // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 7;                                // Neopix
      iBri = 100;                              // Neopix Brightness        
      neopix();
      tone(tonePIN, NOTE_C5);                  // Tone
    }
    else{
      // Black
      red = 0;                                 // Red
      green = 0;                               // Green
      blue = 0;                                // Blue
      iNeo = 7;                                // Neopix
      iBri = 0;                                // Neopix Brightness        
      neopix();
      noTone(tonePIN);                         // noTone 
    }

  }
  else
  {

    digitalWrite(ledY, HIGH);                  // turn that LED On     
    noTone(tonePIN);                           // noTone
    
  }
  
  uView.setFontType(0);  // Set font type 0: Numbers and letters. 10 characters per line (6 lines)

  uView.setCursor(0,10); // EMF Meter
  uView.print( "EMF: " );
  uView.print( average ); 

  // Temperature chip i/o
  isTe();
        
  uView.display();       // Display
   
}

getTemperature.ino

// Temperature chip i/o
void isTe() {

  // Temperature chip i/o
  temperature = getTemp();
  
  uView.setCursor(0,30);  
  uView.print(temperature);
  uView.print(" *C");

}

float getTemp() {
  
  // Returns the temperature from one DS18S20 in DEG Celsius
  byte data[12];
  byte addr[8];
 
  if ( !ds.search(addr)) {
      // No more sensors on chain, reset search
      ds.reset_search();
      return -1001;
  }
 
  if ( OneWire::crc8( addr, 7) != addr[7]) {
      return -1002;
  }
 
  if ( addr[0] != 0x10 && addr[0] != 0x28) {
      return -1003;
  }
 
  ds.reset();
  ds.select(addr);
  ds.write(0x44,1);                           // Start conversion, with parasite power on at the end
 
  byte present = ds.reset();
  ds.select(addr);    
  ds.write(0xBE);                             // Read Scratchpad
 
  
  for (int i = 0; i < 9; i++) {               // we need 9 bytes
    data[i] = ds.read();
  }
  
  ds.reset_search();
  
  byte MSB = data[1];
  byte LSB = data[0];
 
  float tempRead = ((MSB << 8) | LSB);        // Using two's compliment
  float TemperatureSum = tempRead / 16;
  
  return TemperatureSum;
 
}

neopix.ino

void neopix() { 
    
    // Brightness
    pixels.setBrightness( iBri );
    // Pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor( iNeo, pixels.Color(red,green,blue) ); 
    // This sends the updated pixel color to the hardware
    pixels.show(); 
    // Delay for a period of time (in milliseconds)
    delay(50);     
  
}

pitches.h

/*************************************************
 * Public Constants
 *************************************************/
 
// Note
#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

setup.ino

void setup() {

  uView.begin();           // Begin of MicroView
  uView.clear(ALL);        // Erase hardware memory inside the OLED controller
  uView.display();         // Display the content in the buffer memory, by default it is the MicroView logo
  
  delay(1000);
  
  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared.
   
  uView.setFontType(1);    // Set font type 1: Numbers and letters. 7 characters per line (3 lines)
  uView.setCursor(0,20);
  uView.print("Don Luc");  // Don Luc
  uView.display();         // Display
  
  delay(5000);

  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared.

  uView.setFontType(1);    // Set font type 1: Numbers and letters. 7 characters per line (3 lines)
  uView.setCursor(0,20);
  uView.print("EMF Met");  // EMF Meter (Single Axis)
  uView.display();         // Display 
  
  delay(5000);
  
  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared

  // NeoPixels
  pixels.begin();          // This initializes the NeoPixel library
  // EMF Meter (Single Axis)
  pinMode( iEMF, OUTPUT ); // EMF Meter
  for (int i = 0; i < NUMREADINGS; i++){
    readings[ i ] = 0;     // Initialize all the readings to 0
  }
  // LED
  pinMode( ledR, OUTPUT ); // LED Red
  pinMode( ledG, OUTPUT ); // LED Green
  pinMode( ledY, OUTPUT ); // LED Yellow 
  // LED Red - High 
  digitalWrite( ledR, HIGH);
       
}

Don Luc

Project #7: RGB LCD Shield – PIR Motion Sensor – Mk03

PIR Motion Sensor

This is a simple to use motion sensor. Power it up and wait 1-2 seconds for the sensor to get a snapshot of the still room. If anything moves after that period, the ‘alarm’ pin will go low.

This unit works great from 5 to 12V (datasheet shows 12V). You can also install a jumper wire past the 5V regulator on board to make this unit work at 3.3V. Sensor uses 1.6mA@3.3V.

The alarm pin is an open collector meaning you will need a pull up resistor on the alarm pin. The open drain setup allows multiple motion sensors to be connected on a single input pin. If any of the motion sensors go off, the input pin will be pulled low.

We’ve finally updated the connector! Gone is the old “odd” connector, now you will find a common 3-pin JST! This makes the PIR Sensor much more accessible for whatever your project may need. Red = Power, White = Ground, and Black = Alarm.

Buzzer

This is a small 12mm round speaker that operates around the audible 2kHz range. You can use these speakers to create simple music or user interfaces.

This is not a true piezoelectric speaker but behaves similarly. Instead of a piezoelectric crystal that vibrates with an electric current, this tiny speaker uses an electromagnet to drive a thin metal sheet. That means you need to use some form of alternating current to get sound. The good news is that this speaker is tuned to respond best with a square wave (e.g. from a microcontroller).

LED

LED Yellow
LED Green

DonLuc1805Mk07

1 x RGB LCD Shield 16×2 Character Display
1 x Arduino UNO – R3
1 x ProtoScrewShield
1 x PIR Motion Sensor
1 x Buzzer
1 x LED Yellow
1 x LED Green
2 x Jumper Wires 2″ M/F
4 x Jumper Wires 3″ M/M
5 x Jumper Wires 6″ M/M
1 x Half-Size Breadboard

Arduino UNO

JST – Digital 6
BUZ – Digital 2
LEY – Digital 1
LEG – Digital 0
VIN – +5V
GND – GND

DonLuc1805Mk07a.ino

// ***** Don Luc *****
// Software Version Information
// Project #7: RGB LCD Shield – PIR Motion Sensor - Mk03
// 5-3.01
// DonLuc1804Mk07 5-3.01
// RGB LCD Shield
// PIR Motion Sensor (JST}

// include the library code:
#include <Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>

Adafruit_RGBLCDShield RGBLCDShield = Adafruit_RGBLCDShield();
#define GREEN 0x2

// PIR Motion Sensor (JST}
const int buz = 6;          // Buzzer
const int MOTION_PIN = 2;   // Pin connected to motion detector
const int LED_Yellow = 1;   // LED Yellow
const int LED_Green = 0;    // LED Green

void loop() {

  // PIR Motion Sensor (JST}
  isJST();

  delay(1000);
  
  // Clear
  RGBLCDShield.clear();
  
}

getJST.ino

void isJST(){
  
  int proximity = digitalRead(MOTION_PIN);   // PIR Motion Sensor
  
  if (proximity == LOW) // If the sensor's output goes low, motion is detected
  {

    // Motion Detected
    digitalWrite(buz, HIGH);         // Buzzer High
    digitalWrite(LED_Yellow, HIGH);  // LED Yellow High
    digitalWrite(LED_Green, LOW);    // LED Green Low
    
    // Display
    // Set the cursor to column 0, line 0  
    RGBLCDShield.setCursor(0,0);
    RGBLCDShield.print("Motion Detected!");   // Motion Detected!
    // Set the cursor to column 0, line 1
    RGBLCDShield.setCursor(0, 1);
    RGBLCDShield.print("Buzzer On - Yel");     // Buzzer On
   
  }
  else
  {

    // Motion Off
    digitalWrite(buz, LOW);         // Buzzer Low
    digitalWrite(LED_Yellow, LOW);  // LED Yellow Low
    digitalWrite(LED_Green, HIGH);  // LED Green High
    
    // Display
    // Set the cursor to column 0, line 0  
    RGBLCDShield.setCursor(0,0);
    RGBLCDShield.print("Motion Off!");        // Motion Off!
    // Set the cursor to column 0, line 1
    RGBLCDShield.setCursor(0, 1);
    RGBLCDShield.print("Buzzer Off - Gr");    // "Buzzer Off
          
  }
  
}

setup.ino

void setup() {

  // set up the LCD's number of columns and rows: 
  RGBLCDShield.begin(16, 2);
  RGBLCDShield.setBacklight(GREEN);
  
  // Display
  // Set the cursor to column 0, line 0  
  RGBLCDShield.setCursor(0,0);  
  RGBLCDShield.print("Don Luc");         // Don luc
  // Set the cursor to column 0, line 1
  RGBLCDShield.setCursor(0, 1);
  RGBLCDShield.print("Motion Sensor");   // Motion Sensor

  delay(5000);

  // Clear
  RGBLCDShield.clear();
  
  // PIR Motion Sensor (JST}
  pinMode(buz, OUTPUT);                // Buzzer
  pinMode(MOTION_PIN, INPUT_PULLUP);   // PIR Motion Sensor
  pinMode(LED_Yellow, OUTPUT);         // LED Yellow
  pinMode(LED_Green, OUTPUT);          // LED Green  
      
}

Don Luc

Project #6: MicroView – RHT03 Sensor – Mk07

RHT03 Humidity and Temperature Sensor

The RHT03 (also known by DHT-22) is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn’t require extra components so you can get right to measuring relative humidity and temperature.

Features

* 3.3-6V Input
* 1-1.5mA measuring current
* 40-50 uA standby current
* Humidity from 0-100% RH
* -40 – 80 degrees C temperature range
* +-2% RH accuracy
* +-0.5 degrees C

Technical Specification

Model: RHT03
Power supply: 3.3-6V DC
Output signal: Digital signal via MaxDetect 1-wire bus
Sensing element: Polymer humidity capacitor
Operating range: Humidity 0-100%RH; Temperature -40~80C
Accuracy: humidity +-2%RH(Max +-5%RH); Temperature +-0.5C
Resolution or sensitivity: Humidity 0.1%RH; Temperature 0.1C
Repeatability: Humidity +-1%RH; Temperature +-0.2C – Humidity hysteresis – +-0.3%RH
Long-term Stability: +-0.5%RH/year
Interchangeability: Fully interchangeable

DonLuc1805Mk06

1 x MicroView
1 x MicroView – USB Programmer
1 x RHT03
3 x Jumper Wires 3″ M/M
1 x Half-Size Breadboard

MicroView

RHT – PIN 11 – Digital 2
VIN – PIN 15 – +5V
GND – PIN 08 – GND

DonLuc1805Mk06a.ino

// ***** Don Luc *****
// Software Version Information
// 7.01
// DonLuc1804Mk07 7.01
// MicroView
// RHT03 Humidity and Temperature Sensor

// include the library code:
#include <MicroView.h>
#include <SparkFun_RHT03.h>

// RHT Humidity and Temperature Sensor
const int RHT03_DATA_PIN = 2;           // RHT03 data pin Digital 2
RHT03 rht;                              // This creates a RTH03 object, which we'll use to interact with the sensor

void loop() {

  // RHT03 Humidity and Temperature Sensor
  isRHT03();

  delay(1000);
  
  uView.clear(PAGE);  // Erase the memory buffer, the OLED will be cleared
  
}

getRHT.ino

// RHT03 Humidity and Temperature Sensor
void isRHT03(){

  // Call rht.update() to get new humidity and temperature values from the sensor.
  int updateRet = rht.update();
  
  // The humidity(), tempC(), and tempF() functions can be called -- after 
  // a successful update() -- to get the last humidity and temperature
  // value 
  float latestHumidity = rht.humidity();
  float latestTempC = rht.tempC();
  float latestTempF = rht.tempF();

  uView.setFontType(0);  // Set font type 0: Numbers and letters. 10 characters per line (6 lines)
  
  uView.setCursor(0,10); // Humidity
  uView.print( "H : " );
  uView.print( latestHumidity );

  uView.setCursor(0,20); // Temperature *C
  uView.print( "*C: " );
  uView.print( latestTempC );

  uView.setCursor(0,30); // "Temperature *F
  uView.print( "*F: " );
  uView.print( latestTempF );
     
  uView.display();       // Display
   
}

setup.ino

void setup() {

  uView.begin();           // Begin of MicroView
  uView.clear(ALL);        // Erase hardware memory inside the OLED controller
  uView.display();         // Display the content in the buffer memory, by default it is the MicroView logo
  
  delay(1000);
  
  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared.
   
  uView.setFontType(1);    // Set font type 1: Numbers and letters. 7 characters per line (3 lines)
  uView.setCursor(0,20);
  uView.print("Don Luc");  // Don Luc
  uView.display();         // Display
  
  delay(5000);

  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared.

  uView.setFontType(1);    // Set font type 1: Numbers and letters. 7 characters per line (3 lines)
  uView.setCursor(0,20);
  uView.print("RHT03");    // RHT03
  uView.display();         // Display 
  
  delay(5000);
  
  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared
 
  // RHT03 Humidity and Temperature Sensor
  // Call rht.begin() to initialize the sensor and our data pin
  rht.begin(RHT03_DATA_PIN);
    
}

Don Luc

Project #6: MicroView – Accelerometer ADXL335 – Mk06

Accelerometer

An accelerometer is a device that measures proper acceleration. Proper acceleration, being the acceleration (or rate of change of velocity) of a body in its own instantaneous rest frame, is not the same as coordinate acceleration, being the acceleration in a fixed coordinate system. For example, an accelerometer at rest on the surface of the Earth will measure an acceleration due to Earth’s gravity, straight upwards (by definition) of g = 9.81 m/s2. By contrast, accelerometers in free fall (falling toward the center of the Earth at a rate of about 9.81 m/s2) will measure zero.

Triple Axis Accelerometer Breakout – ADXL335

Breakout board for the 3 axis ADXL335 from Analog Devices. This is the latest in a long, proven line of analog sensors – the holy grail of accelerometers. The ADXL335 is a triple axis MEMS accelerometer with extremely low noise and power consumption – only 320uA! The sensor has a full sensing range of +/-3g. There is no on-board regulation, provided power should be between 1.8 and 3.6VDC. Board comes fully assembled and tested with external components installed. The included 0.1uF capacitors set the bandwidth of each axis to 50Hz.

DonLuc1805Mk05

1 x MicroView
1 x MicroView – USB Programmer
1 x Accelerometer ADXL335
5 x Jumper Wires 3″ M/M
1 x Half-Size Breadboard

MicroView

Z-Axis – PIN 07 – Analog A0
Y-Axis – PIN 06 – Analog A1
X-Axis – PIN 05 – Analog A2
VIN – PIN 16 – 3.3V
GND – PIN 08 – GND

DonLuc1805Mk05a.ino

// ***** Don Luc *****
// Software Version Information
// 6.01
// DonLuc1804Mk06 6.01
// MicroView
// Accelerometer ADXL335

// include the library code:
#include <MicroView.h>
#include <ADXL335.h>

// Accelerometer ADXL335
const int pin_x = A0;     // X-Axis
const int pin_y = A1;     // Y-Axis
const int pin_z = A2;     // Z-Axis
const int vin = 16;       // 3.3V
const int gnd = 8;        // GND

ADXL335 accel(pin_x, pin_y, pin_z, vin);

void loop() {

  // Accelerometer ADXL335
  isADXL335();

  delay(500);
  
  uView.clear(PAGE);  // Erase the memory buffer, the OLED will be cleared
  
}

getADXL335.ino

// Accelerometer ADXL335
void isADXL335(){

  // This is required to update the values
  accel.update();

  float rho;
  float phi;
  float theta;  
  
  rho = accel.getRho();
  phi = accel.getPhi();
  theta = accel.getTheta();

  uView.setFontType(0);  // Set font type 0: Numbers and letters. 10 characters per line (6 lines)
  
  uView.setCursor(0,10); // X-Axis
  uView.print( "X: " );
  uView.print( rho );

  uView.setCursor(0,20); // Y-Axis
  uView.print( "Y: " );
  uView.print( phi );

  uView.setCursor(0,30); // Z-Axis
  uView.print( "Z: " );
  uView.print( theta );
     
  uView.display();       // Display
  
}

setup.ino

void setup() {

  uView.begin();           // Begin of MicroView
  uView.clear(ALL);        // Erase hardware memory inside the OLED controller
  uView.display();         // Display the content in the buffer memory, by default it is the MicroView logo
  
  delay(1000);
  
  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared.
   
  uView.setFontType(1);    // Set font type 1: Numbers and letters. 7 characters per line (3 lines)
  uView.setCursor(0,20);
  uView.print("Don Luc");  // Don Luc
  uView.display();         // Display
  
  delay(5000);

  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared.

  uView.setFontType(1);    // Set font type 1: Numbers and letters. 7 characters per line (3 lines)
  uView.setCursor(0,20);
  uView.print("ADXL335");  // ADXL335
  uView.display();         // Display
  
  delay(5000);
  
  uView.clear(PAGE);       // Erase the memory buffer, the OLED will be cleared
 
  // Accelerometer ADXL335
  pinMode(gnd, OUTPUT);    // GND
  pinMode(vin, OUTPUT);    // 3.3V
  digitalWrite(gnd, LOW);
  digitalWrite(vin, HIGH);
  
}

Don Luc

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