Sensors

LDR Light Sensor Module

Photosensitive LDR Light Sensor Module, Photoresistor Detection Board for Arduino and Smart Home

Width: 39.1 mm

Pinout — LDR Light Sensor Module

Pin	Signal	Description
`S`	analog	Analog light sensor output voltage from the LDR divider to a microcontroller input
`GND`	ground	Ground reference for the LDR sensor module and connected controller
`VCC`	power	Positive supply input for the LDR sensor module, typically 3.3V or 5V

Example wiring diagram — LDR Light Sensor Module

From	To	Wire
`board:A0`	`x1:S`	green
`board:GND`	`x1:GND`	black
`board:5V`	`x1:VCC`	red

Example Arduino code — LDR Light Sensor Module

This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.

const int sensorPin = A0;

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ;
  }
  Serial.println("LDR Light Sensor Module example");
}

void loop() {
  int raw = analogRead(sensorPin);
  float voltage = raw * (5.0 / 1023.0);

  Serial.print("Raw: ");
  Serial.print(raw);
  Serial.print("\tVoltage: ");
  Serial.print(voltage, 2);
  Serial.println(" V");

  delay(500);
}

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