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#DonLucElectronics #DonLuc #Sensors #AlcoholGasSensor #MinIMU9 #Pololu #Adafruit #SparkFun #Arduino #Project #Fritzing #Programming #Electronics #Microcontrollers #Consultant
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Pololu Carrier for MQ Gas Sensors
This carrier board is designed to work with any of the MQ-series gas sensors, simplifying the interface from 6 to 3 pins—ground, power and analog voltage output—that are broken out with a 0.1″ spacing, making the board compatible with 0.1″ headers and standard breadboards and perfboards. This board has two mounting holes and provides convenient pads for mounting the gas sensor’s required sensitivity-setting resistor.
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.
How does this relate to the breath? It turns out that there is a standard conversion from breath alcohol content to BAC that is employed by commercial breathalyzers. Our formula for calculating BAC from the alcohol measured in the breath is:
% BAC = Breath mg/L * 0.21
DL2308Mk06
1 x Adafruit METRO M0 Express
1 x DS3231 Precision RTC FeatherWing
1 x Pololu MinIMU-9 v5 Gyro, Accelerometer, and Compass
1 x Pololu Carrier for MQ Gas Sensors
1 x Alcohol Gas Sensor – MQ-3
1 x ProtoScrewShield
1 x Rocker Switch – SPST
2 x Resistor 10K Ohm
1 x CR1220 3V Lithium Coin Cell Battery
1 x SparkFun Cerberus USB Cable
Adafruit METRO M0 Express
LED – LED_BUILTIN
SDA – Digital 20
SCL – Digital 21
SW1 – Digital 2
MQ3 – Analog 0
VIN – +3.3V
VIN – +5V
GND – GND
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DL2308Mk06p.ino
/****** Don Luc Electronics © ******
Software Version Information
Project #28 - Sensors - Alcohol Gas Sensor MQ-3 - Mk05
28-05
DL2308Mk06p.ino
1 x Adafruit METRO M0 Express
1 x DS3231 Precision RTC FeatherWing
1 x Pololu MinIMU-9 v5 Gyro, Accelerometer, and Compass
1 x Pololu Carrier for MQ Gas Sensors
1 x Alcohol Gas Sensor - MQ-3
1 x ProtoScrewShield
1 x Rocker Switch - SPST
2 x Resistor 10K Ohm
1 x CR1220 3V Lithium Coin Cell Battery
1 x SparkFun Cerberus USB Cable
*/
// Include the Library Code
// DS3231 Precision RTC
#include <RTClib.h>
// Two Wire Interface (TWI/I2C)
#include <Wire.h>
// Keyboard
#include <Keyboard.h>
// Includes and variables for IMU integration
// STMicroelectronics LSM6DS33 Gyroscope and Accelerometer
#include <LSM6.h>
// STMicroelectronics LIS3MDL Magnetometer
#include <LIS3MDL.h>
// Keyboard
String sKeyboard = "";
// DS3231 Precision RTC
RTC_DS3231 rtc;
String dateRTC = "";
String timeRTC = "";
// Pololu 9DoF IMU
// STMicroelectronics LSM6DS33 Gyroscope and Accelerometer
LSM6 imu;
// Accelerometer and Gyroscopes
// Accelerometer
int imuAX;
int imuAY;
int imuAZ;
// Gyroscopes
int imuGX;
int imuGY;
int imuGZ;
// STMicroelectronics LIS3MDL Magnetometer
LIS3MDL mag;
// Magnetometer
int magX;
int magY;
int magZ;
// Gas Sensors MQ
// Alcohol Gas Sensor - MQ-3
int iMQ3 = A0;
int iMQ3Raw = 0;
int iMQ3ppm = 0;
// The number of the button pin
int iButton = 2;
// Variable for reading the button status
int buttonState = 0;
// Software Version Information
String sver = "28-05";
void loop() {
// Date and Time RTC
isRTC ();
// Pololu Accelerometer and Gyroscopes
isIMU();
// Pololu Magnetometer
isMag();
// Gas Sensors MQ
isGasSensor();
// Read the state of the button value:
buttonState = digitalRead(iButton);
// Check if the button is pressed. If it is, the buttonState is HIGH:
if (buttonState == HIGH) {
Keyboard.println(sKeyboard);
}
// Delay 1 Second
delay(1000);
}
getAccelGyro.ino
// Accelerometer and Gyroscopes
// Setup IMU
void setupIMU() {
// Setup IMU
imu.init();
// Default
imu.enableDefault();
}
// Accelerometer and Gyroscopes
void isIMU() {
// Accelerometer and Gyroscopes
imu.read();
// Accelerometer x, y, z
imuAX = imu.a.x;
imuAY = imu.a.y;
imuAZ = imu.a.z;
// Gyroscopes x, y, z
imuGX = imu.g.x;
imuGY = imu.g.y;
imuGZ = imu.g.z;
sKeyboard = sKeyboard + String(imuAX) + "|" + String(imuAY) + "|" + String(imuAZ) + "|";
sKeyboard = sKeyboard + String(imuGX) + "|" + String(imuGY) + "|" + String(imuGZ) + "|";
}
getGasSensorMQ.ino
// Gas Sensors MQ
// Gas Sensor
void isGasSensor() {
// Read in analog value from each gas sensors
// Alcohol Gas Sensor - MQ-3
iMQ3ppm = isMQ3( iMQ3Raw );
sKeyboard = sKeyboard + String(iMQ3ppm) + "|*";
}
// Alcohol Gas Sensor - MQ-3
int isMQ3(double rawValue) {
double RvRo = rawValue;
// % BAC = breath mg/L * 0.21
double bac = RvRo * 0.21;
return bac;
}
getIMUMagnetometer.ino
// IMU Magnetometer
// Setup Magnetometer
void setupMag() {
// Setup Magnetometer
mag.init();
// Default
mag.enableDefault();
}
// Magnetometer
void isMag() {
// Magnetometer
mag.read();
// Magnetometer x, y, z
magX = mag.m.x;
magY = mag.m.y;
magZ = mag.m.z;
sKeyboard = sKeyboard + String(magX) + "|" + String(magY) + "|"
+ String(magZ) + "|";
}
getRTC.ino
// Date & Time
// DS3231 Precision RTC
void setupRTC() {
// DS3231 Precision RTC
if (! rtc.begin()) {
//Serial.println("Couldn't find RTC");
//Serial.flush();
while (1) delay(10);
}
if (rtc.lostPower()) {
//Serial.println("RTC lost power, let's set the time!");
// When time needs to be set on a new device, or after a power loss, the
// following line sets the RTC to the date & time this sketch was compiled
rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
// This line sets the RTC with an explicit date & time, for example to set
// January 21, 2014 at 3am you would call:
//rtc.adjust(DateTime(2023, 8, 10, 11, 0, 0));
}
}
// Date and Time RTC
void isRTC () {
// Date and Time
dateRTC = "";
timeRTC = "";
DateTime now = rtc.now();
// Date
dateRTC = now.year(), DEC;
dateRTC = dateRTC + "/";
dateRTC = dateRTC + now.month(), DEC;
dateRTC = dateRTC + "/";
dateRTC = dateRTC + now.day(), DEC;
// Time
timeRTC = now.hour(), DEC;
timeRTC = timeRTC + ":";
timeRTC = timeRTC + now.minute(), DEC;
timeRTC = timeRTC + ":";
timeRTC = timeRTC + now.second(), DEC;
sKeyboard = "SEN|" + sver + "|" + String(dateRTC) + "|" +
String(timeRTC) + "|";
}
setup.ino
// Setup
void setup()
{
// Give display time to power on
delay(100);
// Wire - Inialize I2C Hardware
Wire.begin();
// Give display time to power on
delay(100);
// Date & Time RTC
// DS3231 Precision RTC
setupRTC();
// Initialize control over the keyboard:
Keyboard.begin();
// Pololu Setup IMU
setupIMU();
// Pololu Setup Magnetometer
setupMag();
// Initialize the button pin as an input
pinMode(iButton, INPUT);
// Initialize digital pin LED_BUILTIN as an output
pinMode(LED_BUILTIN, OUTPUT);
// Turn the LED on HIGH
digitalWrite(LED_BUILTIN, HIGH);
// Delay 5 Second
delay( 5000 );
}
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