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#DonLucElectronics #DonLuc #DFRobot #SoilMoistureSensor #FireBeetle2ESP32E #ESP32 #IoT #Arduino #Project #Fritzing #Programming #Electronics #Microcontrollers #Consultant

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Gravity: Analog Soil Moisture Sensor

A soil moisture sensor can read the amount of moisture present in the soil surrounding it. It’s an ideal for monitoring an urban garden, or your pet plant’s water level. This is a must have component for a IOT Garden / Agriculture. The new soil moisture sensor uses Immersion Gold which protects the nickel from oxidation. Electroless nickel immersion gold has several advantages over more conventional surface platings such as HASL, including excellent surface planarity, good oxidation resistance, and usability for untreated contact surfaces such as membrane switches and contact points.

This Soil Moisture Sensor uses the two probes to pass current through the soil, and then it reads that resistance to get the moisture level. More water makes the soil conduct electricity more easily, while dry soil conducts electricity poorly. This sensor will be helpful to remind you to water your indoor plants or to monitor the soil moisture in your garden.

DL2402Mk04

1 x DFRobot FireBeetle 2 ESP32-E
1 x Gravity: Analog Soil Moisture Sensor
1 x 1 x Lithium Ion Battery – 1000mAh
1 x Rocker Switch – SPST
1 x Resistor 10K Ohm
1 x USB 3.1 Cable A to C

DFRobot FireBeetle 2 ESP32-E

LED – 2
RSW – 17
SMS – A0
VIN – +3.3V
GND – GND

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DL2402Mk04p.ino

/****** Don Luc Electronics © ******
Software Version Information
Project #29 - DFRobot - Gravity Soil Moisture Sensor - Mk04
29-04
DL2402Mk04p.ino
1 x DFRobot FireBeetle 2 ESP32-E
1 x Gravity: Analog Soil Moisture Sensor
1 x Rocker Switch - SPST
1 x Resistor 10K Ohm
1 x 1 x Lithium Ion Battery - 1000mAh
1 x USB 3.1 Cable A to C
*/

// Include the Library Code
// Bluetooth LE keyboard
#include <BleKeyboard.h>

// Bluetooth LE Keyboard
BleKeyboard bleKeyboard;
String sKeyboard = "";
// Send Size
byte sendSize = 0;

// Gravity: Analog Soil Moisture Sensor
int iSoilMoisture = A0;
int iSoilMoistureVal = 0;

// The number of the Rocker Switch pin
int iSwitch = 17;
// Variable for reading the button status
int SwitchState = 0;

// Define LED
int iLED = 2;

// Software Version Information
String sver = "29-04";

void loop() {

  // Gravity: Analog Soil Moisture Sensor
  isSoilMoisture();

  // Read the state of the Switch value:
  SwitchState = digitalRead(iSwitch);

  // Check if the button is pressed. If it is, the SwitchState is HIGH:
  if (SwitchState == HIGH) {

    // Bluetooth LE Keyboard
    isBluetooth();

  }
  
  // Delay 1 Second
  delay(1000);

}

getBleKeyboard.ino

// Ble Keyboard
// Bluetooth
// isBluetooth
void isBluetooth() {

  // ESP32 BLE Keyboard
  if(bleKeyboard.isConnected()) {

    // Send Size Length
    sendSize = sKeyboard.length();

    // Send Size, charAt
    for(byte i = 0; i < sendSize+1; i++){

       // Write
       bleKeyboard.write(sKeyboard.charAt(i));
       delay(50);
    
    }
    bleKeyboard.write(KEY_RETURN);

  }

}

getSoilMoisture.ino

// Gravity: Analog Soil Moisture Sensor
// Soil Moisture
void isSoilMoisture(){

  // Connect Soil Moisture Sensor to Analog 0
  iSoilMoistureVal = analogRead( iSoilMoisture );

  // SData => 0~900 Soil Moisture
  float SData = map( iSoilMoistureVal, 1, 3000, 0, 900);

  // bleKeyboard
  // DFR|Version|Soil Moisture|*
  sKeyboard = "DFR|" + sver + "|" + String(SData) + "|*";

}

setup.ino

// Setup
void setup()
{
  
  // Give display time to power on
  delay(100);

  // Bluetooth LE keyboard
  bleKeyboard.begin();

  // Give display time to power on
  delay(100);
  
  // Initialize the Switch pin as an input
  pinMode(iSwitch, INPUT);
  
  // Initialize digital pin iLED as an output
  pinMode(iLED, OUTPUT);
  // Outputting high, the LED turns on
  digitalWrite(iLED, HIGH);

  // Delay 5 Second
  delay( 5000 );

}

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