LDR Light Sensor Module

The LDR light Module detects the embient light, it includes a high precision comparator (LM393) and a adjustable potentionmeter to make design in simple way.

A light sensor (LDR or Light Dependent Resistor) is a simple component that provides a variable resistance that changes with light.

Light sensor Module
Schmatic : sch_sensor.pdf
LM393 Spec. : lm393-n.pdf
Sales Price : RM10.00


  • Operating voltage : DC +3.3V/5V
  • Onboard power status LED.
  • Onboard sensor status LED.

Pin Definition:

  • PIN#1 : AO - Analog output, real-time output voltage signal on the sensor's resistance.
  • PIN#2 : GND - Ground.
  • PIN#3 : VCC - Power input, DC +3.3V/5V.
  • PIN#4 : DO - Sensor detection output (Logic 'H'/'L'). The threshold adjustable via potentiometer.