KY-018 Photoresistor Module - ArduinoModulesInfo

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The KY-018 Photoresistor module is used to measure light intensity. The resistance will decrease in the presence of light and increase in the absence of it. The output is analog and determines the intensity of light.

Compatible with many popular microcontrollers like Arduino, ESP32 and others.

KY-018 photoresistor Fritzing part image
Arduino KY-018 Photoresistor Module

KY-018 Specifications

This module consists of a photoresistor, a 10 kΩ in-line resistor and 3 male header pins.

Operating Voltage3.3V ~ 5V
Output TypeAnalog

Connection Diagram

Connect the Power line (middle) and ground (-) to +5 and GND respectively. Connect signal (S) to pin A2 on the Arduino.

KY-018Arduino
SPin A2
middle+5V
–GND
Arduino KY-018 Keyes photo resistor connection diagram

KY-018 Arduino Code

The following Arduino sketch will output readings from the photoresistor, cover the module with your hand to prevent light on it and the output values will be low, point a light to the sensor and the values will be high.

int sensorPin = 2; //define analog pin 2 int value = 0; void setup() { Serial.begin(9600); } void loop() { value = analogRead(sensorPin); Serial.println(value, DEC); // light intensity // high values for bright environment // low values for dark environment delay(100); }

Downloads

  • Fritzing Part: KY-018 Photoresistor Module.
  • Fritzing Official Site.

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