Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Pin Count	4-Pin
Sensor Type	Photoresistor (LDR)
Operating Voltage	3.3V - 5V DC
Output Signal	Digital Switch Output (DO) & Analog Output (AO)
Comparator Chip	LM393
Sensitivity Adjustment	Potentiometer included
PCB Size	32mm x 14mm
Mounting Hole Diameter	3mm
Compatibility	Arduino, Raspberry Pi, ESP32, STM32
Application	Light detection, automatic street lights, camera exposure control

6 reviews

Anonymous

Mar 30, 2026

Rating: 4/5

Solid component

Works as expected. The PCB layout is clean, and the soldering points are well-defined. Just make sure you don't exceed 5V input or you might damage the comparator.

Anonymous

Mar 29, 2026

Rating: 5/5

Perfect for Arduino projects

This sensor module works flawlessly with my Arduino Uno. The analog output gives smooth readings, and the digital threshold is easy to adjust with the onboard potentiometer. Great value for the price.

Anonymous

Mar 25, 2026

Rating: 5/5

Excellent precision

The ability to tune the sensitivity makes this module versatile for different lighting conditions. I've tested it in both direct sunlight and dim indoor lighting, and it performs well in both.

Anonymous

Mar 14, 2026

Rating: 5/5

Great for learning electronics

Bought a pack of these for my university robotics club. They are robust enough to handle beginner mistakes and provide consistent data for our line-following robots.

Anonymous

Mar 11, 2026

Rating: 4/5

Good sensitivity, clear instructions needed

The hardware quality is solid and the LM393 chip is reliable. I deducted one star because there were no printed instructions on how to wire the 4 pins, but a quick online search solved it.

Anonymous

Mar 09, 2026

Rating: 5/5

Reliable light detection

I used this to build an automatic night light system. It detects dusk perfectly and triggers the relay without any false positives. The response time is very fast.

5 FAQ

Q: How do I adjust the sensitivity of the light detection?

A: There is a blue potentiometer on the board. Use a small screwdriver to rotate it clockwise or counter-clockwise while monitoring the output until the desired light threshold is achieved.

Q: Can I use this with a Raspberry Pi?

A: Yes, you can. Connect the VCC to 5V or 3.3V, GND to ground, and the DO or AO pin to a GPIO pin. Note that if using the Analog Output, you will need an external ADC since Raspberry Pi GPIOs are digital only.

Q: Does this module output analog or digital signals?

A: This module provides both! It has an Analog Output (AO) pin for continuous light intensity readings and a Digital Output (DO) pin that switches high/low based on your threshold setting.

Q: Is the photoresistor replaceable if it breaks?

A: Yes, the photoresistor is through-hole soldered, so it can be desoldered and replaced with a standard LDR component if necessary, though they are quite durable under normal use.

Q: What is the maximum voltage this sensor can handle?

A: The operating voltage range is 3.3V to 5V DC. Please do not connect it to voltages higher than 5V, as this may permanently damage the LM393 comparator chip.

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