LDR Sensor Module | Light Dependent Resistor Sensor

The LDR sensor module detects ambient light using an LDR (light dependent resistor, a component whose resistance drops as light increases). When light falls on the sensor, resistance drops and the output changes. The ldr light sensor connects to any Arduino or ESP board through a standard 4-pin header and gives both digital and analog output.

One non-obvious detail is that the digital threshold is adjustable using the onboard potentiometer, so you can set exactly how dark it needs to be before the output switches. The honest limitation is that the ldr sensor arduino reading shifts with temperature as well as light, so calibrate in your actual environment. Hobbyists use this ldr light sensor module for automatic lighting and alarm projects. Connect VCC to 5V, GND to ground, and read the DO pin on any digital input. StemVolt provides sensor with trusted quality, ensuring reliable performance and easy usability.

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Features:

• Operates at 5V DC supply allowing direct connection to Arduino and ESP32 boards
• LM393 comparator IC drives the digital pin with a clean and stable logic signal
• Analog output pin gives a variable voltage for reading actual light intensity values

Technical Specifications:

Applications:

• An automatic night lamp uses this to switch on a light when the room gets dark
• A security project uses this to trigger an alert when outside light drops
• LDR sensor module reads ambient light and controls brightness automatically

Package Includes:

• 1 x LDR Sensor Module