LDR Light Sensor Module 4-Pin

The LDR light sensor module 4-pin detects how bright or dark the surrounding area is. LDR stands for light dependent resistor, a component that lowers its resistance when light falls on it. The ldr module gives you both a digital output (DO) for threshold-based detection and an analog output (AO) for measuring actual light level. Connect VCC and GND to your board supply and you get readings instantly.

The ldr sensor module uses the LM393 comparator IC to drive the digital pin. One thing to know is that the analog output does not give lux values directly — get a raw ADC number that changes with light, so calibrate for your specific environment. Students and beginners all use this light sensor module from StemVolt for automatic lighting and line-following projects. Plug into any analog and digital pin on Arduino or NodeMCU and start reading values right away.

Related Products:

• Checkout the LDR Sensor Module 3 pin

Features:

• Operates at 3.3V to 5V DC supply so it works with 3.3V ESP boards directly
• Analog output pin gives variable voltage readable by any ADC-capable microcontroller
• 4-pin interface with VCC, GND, DO and AO covers both output types in one module

Technical Specifications:

Applications:

• An automatic street light project uses this to turn lights on at dark
• A day or night detector reads light level and shows status on an led display
• An LDR light sensor module 4-pin reads ambient light and adjusts LCD brightness automatically
• A line follower robot reads reflected light level and steers using the digital output

Package Includes:

• 1 x LDR Light Sensor Module 4-Pin