Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Chip Model	LM393 Dual Comparator
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch Output (0 and 1)
Indicator	Green Power LED, Red Signal LED
Comparator Sensitivity	Adjustable via Potentiometer
PCB Dimensions	32mm x 14mm x 8mm
Mounting Holes	3mm diameter for easy fixation
Interface	3-Pin PH2.54 Connector (VCC, GND, OUT)
Compatibility	Arduino, Raspberry Pi, STM32, ESP8266
Application Scope	Line tracking, Obstacle avoidance, Pulse detection

6 reviews

Anonymous

Mar 29, 2026

Rating: 4/5

Solid build quality

The PCB looks clean and the soldering points are well done. It responded quickly to changes in light intensity during my testing. Only minor issue is the header pins were slightly bent upon arrival, but easy to fix.

Anonymous

Mar 27, 2026

Rating: 5/5

Easy to use

As someone new to electronics, I found this module very forgiving. Connecting VCC, GND, and OUT was all it took to get it working. The tutorial examples online for this specific board are plentiful.

Anonymous

Mar 26, 2026

Rating: 5/5

Reliable comparator module

I use this primarily for pulse detection in a tachometer setup. The LM393 chip provides stable comparisons and the red LED gives a clear visual indication of the trigger state. Highly recommended.

Anonymous

Mar 09, 2026

Rating: 4/5

Good sensitivity range

The potentiometer allows for a wide range of threshold adjustments. It worked well for detecting shadows in my light barrier experiment. Documentation could be better, but standard LM393 datasheets apply.

Anonymous

Mar 06, 2026

Rating: 5/5

Great for university projects

Bought five of these for a sensor array project. All of them worked out of the box. The digital output makes interfacing with microcontrollers incredibly simple without needing extra code for analog reading.

Anonymous

Mar 01, 2026

Rating: 5/5

Perfect for beginner robotics

This LM393 module works flawlessly with my Arduino Uno. The sensitivity adjustment is very smooth, allowing me to calibrate it perfectly for my line-following robot. Great value for the price.

5 FAQ

Q: Does this come with header pins pre-soldered?

A: No, the module usually ships with the header pins included in the package but not soldered. This allows you to choose between straight or right-angle headers depending on your project's mechanical requirements.

Q: Can I use this to detect metal objects?

A: Not directly. This is an optical comparator module relying on light reflection. To detect metal, you would need an inductive proximity sensor. However, you could use this module if the metal object interrupts a light beam in a custom setup.

Q: What is the maximum current this sensor can switch?

A: The LM393 comparator output is designed for signal processing, not high-power switching. It can typically sink up to 16mA, which is sufficient for driving an LED or a microcontroller input pin, but you should use a transistor or relay for higher loads.

Q: Can this module detect color differences or just light intensity?

A: This module detects changes in light intensity reflected off a surface. While it cannot identify specific colors like a camera, it is excellent for distinguishing between black and white lines based on reflectivity.

Q: Is the output voltage compatible with 3.3V logic boards like ESP32?

A: Yes, the module operates on a supply voltage of 3.3V to 5V. When powered by 3.3V, the digital output high level will be compatible with 3.3V logic microcontrollers like the ESP32 or ESP8266.

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