Reading Light Level with KY-018 LDR Sensor on ESP32

Overview

Learn how to use the KY-018 LDR light sensor with an ESP32 to measure brightness. This project is useful for automatic lights, light-activated alarms, and day/night detection.

Instructions

Step by step

1. Connect the LDR VCC pin to 3.3V. 2. Connect the LDR GND pin to GND. 3. Connect the LDR S pin to D34. 4. Run the code and open the Serial Monitor. 5. Change the light level in the simulator. 6. A higher value means brighter light. 7. A lower value means darker light.

Code

Source code

code

const int ldrPin = 34;

void setup() {
  Serial.begin(115200);

  Serial.println("KY-018 LDR Light Sensor Test");
}

void loop() {
  int lightValue = analogRead(ldrPin);

  Serial.print("Light level: ");
  Serial.println(lightValue);

  delay(1000);
}

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