Soil Moisture Sensor YL-69 or HL-69 with Arduino

 

- A guide for the Soil Moisture Sensor YL-69 or HL-69 with Arduino provides step-by-step instructions on incorporating these sensors into electronic projects. These sensors are specifically designed to measure soil moisture levels, making them essential for applications like smart irrigation systems, plant monitoring, or agriculture automation. The guide typically includes details on wiring the sensor to an Arduino board, sample code for Arduino programming, and explanations on interpreting the moisture sensor readings. By following this guide, users can effectively integrate soil moisture sensors with Arduino, enabling their projects to optimize water usage and enhance plant care based on real-time soil conditions.

- The YL-69 or HL-69 soil moisture sensor is commonly used to measure the moisture content in soil. Here's a basic guide on how to connect and use a soil moisture sensor with an Arduino:

Components Needed:

1x YL-69 moisture sensor 

Arduino UNO – read Best Arduino Starter Kits

1x Breadboard

2x 220 Ohm Resistors

1x Red LED

1x Green LED

Jumper wires

Wiring:

Connect the soil moisture sensor as follows:

Connect the VCC pin to 5V on Arduino.

Connect the GND pin to GND on Arduino.

Connect the A0 pin to an analog pin on Arduino.

Arduino Code:

Here's a simple example to read the analog output from the soil moisture sensor:

int rainPin = A0;

int greenLED = 6;

int redLED = 7;

// you can adjust the threshold value

int thresholdValue = 800;

void setup(){

  pinMode(rainPin, INPUT);

  pinMode(greenLED, OUTPUT);

  pinMode(redLED, OUTPUT);

  digitalWrite(greenLED, LOW);

  digitalWrite(redLED, LOW);

  Serial.begin(9600);

}

void loop() {

  // read the input on analog pin 0:

  int sensorValue = analogRead(rainPin);

  Serial.print(sensorValue);

  if(sensorValue < thresholdValue){

    Serial.println(" - Doesn't need watering");

    digitalWrite(redLED, LOW);

    digitalWrite(greenLED, HIGH);

  }

  else {

    Serial.println(" - Time to water your plant");

    digitalWrite(redLED, HIGH);

    digitalWrite(greenLED, LOW);

  }

  delay(500);

}

Interpretation:

The analog value represents the resistance between the sensor probes, which varies with the soil moisture content. Lower values typically indicate higher moisture levels.

Calibration:

Calibrate the sensor by measuring analog values in dry and wet soil conditions. Adjust the code or create a threshold based on your calibration.

Note:

Soil moisture sensors provide a relative measurement and may require calibration for accurate readings.

Ensure proper placement of the sensor probes in the soil to get accurate readings.

Adjust the pin numbers in the code to match your actual wiring configuration. Depending on your project requirements, you may want to implement a more sophisticated algorithm for moisture interpretation or integrate the sensor readings into a larger project.

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