How to Use YL-83 Module LM393: Examples, Pinouts, and Specs

The YL-83 Module LM393 is a soil moisture sensor designed to measure the moisture content in soil. It utilizes the LM393 comparator to provide a digital output signal that indicates whether the moisture level has crossed a certain threshold. This sensor is commonly used in gardening projects, automated plant watering systems, and environmental monitoring.

• Automated irrigation systems
• Plant monitoring systems
• Environmental sensing
• DIY gardening projects

• Operating Voltage: 3.3V to 5V
• Output Type: Digital
• Current: 15mA
• Interface: Digital (D0), Analog (A0)
• Comparator: LM393

1. Connect the VCC pin to a 3.3V or 5V power supply.
2. Connect the GND pin to the ground of the power supply.
3. Connect the D0 pin to a digital input pin on a microcontroller if you wish to use the digital output.
4. Connect the A0 pin to an analog input pin on a microcontroller if you wish to use the analog output.

• Avoid submerging the sensor completely in water to prevent corrosion.
• Calibrate the sensor by adjusting the onboard potentiometer to set the moisture threshold for the digital output.
• Use a pull-up resistor if the digital output is unstable.
• For outdoor applications, protect the electronic components from water damage.

// Define the sensor's digital and analog pins
const int sensorDigitalPin = 2; // Digital output from sensor
const int sensorAnalogPin = A0; // Analog output from sensor

void setup() {
  pinMode(sensorDigitalPin, INPUT); // Set digital pin as input
  Serial.begin(9600); // Start serial communication at 9600 baud
}

void loop() {
  int sensorDigitalValue = digitalRead(sensorDigitalPin); // Read digital value
  int sensorAnalogValue = analogRead(sensorAnalogPin); // Read analog value

  // Print the values to the serial monitor
  Serial.print("Digital Value: ");
  Serial.print(sensorDigitalValue);
  Serial.print(" | Analog Value: ");
  Serial.println(sensorAnalogValue);

  delay(1000); // Wait for 1 second before reading again
}

• Sensor not responding: Ensure that the VCC and GND connections are correct and secure.
• Inconsistent readings: Check for loose connections and ensure the sensor is not submerged in water.
• No change in digital output: Adjust the onboard potentiometer to calibrate the moisture threshold.

• If the digital output does not change, try turning the potentiometer clockwise to increase sensitivity or counterclockwise to decrease it.
• Clean the sensor probes regularly to prevent false readings due to soil buildup.
• If using long wires to connect the sensor, consider using shielded cables to reduce noise.

Q: Can the YL-83 Module LM393 be used with a 3.3V system? A: Yes, the sensor can operate at 3.3V, making it compatible with both 5V and 3.3V systems.

Q: How do I know if the sensor is working correctly? A: You can test the sensor by inserting it into soil with known moisture levels or by using it to detect water in a cup.

Q: Is the sensor waterproof? A: The sensor probe is water-resistant, but the electronic components are not waterproof. Protect the module from water damage when used outdoors.

Q: How long can the sensor be left in the soil? A: The sensor can be left in the soil for extended periods; however, prolonged exposure to moisture can lead to corrosion. Regular inspection and maintenance are recommended.