Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Chip Model	LM393
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switching (Open Collector)
Comparator Channels	Dual Independent Comparators
Potentiometer	Adjustable Sensitivity Threshold
Indicator LED	Power and Output Status LEDs
Mounting Hole Diameter	3.0 mm
PCB Dimensions	32mm x 14mm
Interface Pins	VCC, GND, DO (Digital Output), AO (Analog Output)
Application Scope	Arduino, Raspberry Pi, STM32, MCU Learning

6 reviews

Anonymous

Mar 20, 2026

Rating: 5/5

Great value for money

Bought five of these for a workshop. All of them worked out of the box. The output LED is bright enough to see status clearly in daylight. Fast shipping too.

Anonymous

Mar 18, 2026

Rating: 4/5

Solid build quality, clear documentation

Good quality PCB with clear silkscreen labels. The dual comparator feature is useful, though I mostly use one channel. Works flawlessly with 3.3V logic levels on my ESP32 board.

Anonymous

Mar 15, 2026

Rating: 5/5

Perfect for beginner electronics projects

This LM393 module is exactly what I needed for my Arduino light sensor project. The adjustable potentiometer makes it very easy to set the threshold without needing complex code. Highly recommended for students.

Anonymous

Mar 05, 2026

Rating: 5/5

Exceeded expectations

I was worried about noise issues, but the module is quite stable. The comparison point stays consistent even with minor voltage fluctuations. A staple component for my lab now.

Anonymous

Mar 05, 2026

Rating: 5/5

Reliable for line following robots

We used these modules for our line-following robot competition. The response time is quick, and the sensitivity adjustment allows us to fine-tune for different track surfaces.

Anonymous

Mar 01, 2026

Rating: 4/5

Easy to interface

Very straightforward to connect. Just VCC, GND, and DO. The analog output is a nice bonus if you need raw data, but the digital output is what most people will use.

5 FAQ

Q: What is the difference between the DO and AO pins?

A: DO (Digital Output) provides a high/low signal based on your threshold setting, while AO (Analog Output) provides the raw voltage value from the sensor for more granular analysis.

Q: Is there a schematic available for this board?

A: Yes, a basic schematic showing the LM393 chip connections, pull-up resistors, and LED indicators is available in the product documentation section on our website.

Q: Can this module work directly with a 3.3V microcontroller like ESP8266?

A: Yes, the LM393 module operates within a 3.3V to 5V range, making it fully compatible with 3.3V logic microcontrollers like the ESP8266 and ESP32.

Q: Can I use this to detect sound levels?

A: This specific module is a voltage comparator. To detect sound, you would need to connect a microphone sensor to the input of this module, which then compares the audio signal against your set threshold.

Q: Does this come with headers soldered?

A: The module typically comes with unsoldered pin headers included in the package, allowing you to choose between straight or right-angle mounting based on your project needs.

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