The KY-018 Photoresistor Module is a small, low-cost light sensor used to measure ambient light intensity. It features a light-dependent resistor (LDR) and a built-in 10 kΩ resistor. Its resistance changes based on light levels, outputting an analog voltage signal compatible with microcontrollers like Arduino

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.

Operating Voltage: 3.3V to 5V DC
Output Type: Analog signal
Dark Resistance: ~1 MΩ (in complete darkness)
Light Resistance: Drops to a few hundred ohms or ~10 kΩ (in bright light)
Dimensions: 21 x 15 x 6 mm