How to Use GSR Sensor: Examples, Pinouts, and Specs

Connecting the GSR Sensor:

• Connect the VCC pin to a 3.3V or 5V power source.
• Connect the GND pin to the ground of your circuit.
• Connect the SIG pin to an analog input pin of a microcontroller (e.g., Arduino UNO).

Using the GSR Sensor in a Circuit:

• Place the sensor electrodes on the skin (commonly on fingers or palms) to measure skin conductance.
• Ensure the electrodes are clean and make good contact with the skin for accurate readings.
• Avoid excessive movement during measurements to reduce noise in the signal.

Arduino UNO Example Code: Below is an example of how to use the GSR sensor with an Arduino UNO to read and display the sensor's output:

// Define the analog pin connected to the GSR sensor's SIG pin
const int GSR_PIN = A0;

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud
  pinMode(GSR_PIN, INPUT); // Set the GSR pin as an input
}

void loop() {
  int sensorValue = analogRead(GSR_PIN); // Read the analog value from the sensor
  
  // Convert the analog value to voltage (assuming 5V reference)
  float voltage = sensorValue * (5.0 / 1023.0);

  // Print the raw sensor value and voltage to the Serial Monitor
  Serial.print("Raw Value: ");
  Serial.print(sensorValue);
  Serial.print(" | Voltage: ");
  Serial.println(voltage);

  delay(500); // Wait for 500ms before the next reading
}

• Note: Adjust the reference voltage in the code if using a 3.3V system.

Best Practices:

• Ensure the sensor is calibrated for the specific application to improve accuracy.
• Avoid using the sensor in environments with high humidity or extreme temperatures.
• Clean the electrodes regularly to maintain consistent performance.

No Output or Constant Readings:

• Cause: Poor connection between the sensor and the skin.
• Solution: Ensure the electrodes are securely placed on the skin and making good contact.

Fluctuating or Noisy Readings:

• Cause: Excessive movement or environmental interference.
• Solution: Minimize movement during measurements and ensure the sensor is used in a stable environment.

Low Sensitivity:

• Cause: Dirty or worn-out electrodes.
• Solution: Clean the electrodes with a soft cloth and ensure they are free of dirt or oils.

Incorrect Voltage Readings:

• Cause: Incorrect reference voltage in the code.
• Solution: Verify the power supply voltage and update the code accordingly.