Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Chip Model | LM393 Dual Voltage Comparator |
| Operating Voltage | DC 3.3V to 5V |
| Output Type | Digital Switching Output (0 and 1) |
| Comparator Sensitivity | Adjustable via Potentiometer |
| Indicator LED | Yes, indicates output status |
| PCB Dimensions | 32mm x 14mm x 8mm |
| Mounting Holes | 3mm diameter for easy installation |
| Interface | 3-Pin Header (VCC, GND, OUT) |
| Compatibility | Arduino, Raspberry Pi, STM32, ESP8266 |
| Application Scope | Voltage detection, Signal comparison, Sensor interfacing |
Anonymous
Mar 25, 2026
Rating: 5/5
Perfect for beginner electronics projects
This LM393 module works exactly as described. I used it to build a simple battery level indicator for my robot project. The potentiometer makes calibration very easy, and the output is stable.
Anonymous
Mar 23, 2026
Rating: 5/5
Essential sensor accessory
If you are working with analog sensors that need digital conversion, this is a must-have. It simplifies the code significantly by handling the threshold logic in hardware.
Anonymous
Mar 12, 2026
Rating: 5/5
Reliable voltage comparison
I've tested this against a multimeter and the switching point is accurate once adjusted. The LED indicator is bright enough to see status at a glance. Very happy with this purchase.
Anonymous
Mar 12, 2026
Rating: 4/5
Compact and functional
Small footprint fits well on crowded breadboards. The only minor issue is that the header pins were slightly loose upon arrival, but a quick re-solder fixed that immediately.
Anonymous
Mar 08, 2026
Rating: 4/5
Good value, clear instructions needed
The hardware quality is solid for the price. The soldering points are clean. However, it would be nice if it came with a printed pinout diagram, though you can find one easily online.
Anonymous
Mar 01, 2026
Rating: 5/5
Great for university labs
Bought a pack of these for our microcontroller lab course. They handle the 5V logic from our Arduino boards perfectly without any level shifting issues. Highly recommended for students.
Q: Does this come with header pins pre-soldered?
A: No, the module usually ships with unsoldered header pins to prevent damage during shipping. You will need to solder them yourself or use jumper wires.
Q: Can I use this to compare two varying analog signals?
A: Yes, that is the primary function of the LM393. You can feed one signal to the non-inverting input and another to the inverting input to determine which is higher.
Q: Can this module work directly with a 3.3V ESP32?
A: Yes, the LM393 module operates within a DC 3.3V to 5V range, making it fully compatible with 3.3V logic systems like the ESP32.
Q: Is there a schematic available for this specific board layout?
A: Yes, a basic schematic showing the LM393 chip, pull-up resistor, and potentiometer connection is available in the product documentation section on our website.
Q: What is the maximum current this output pin can sink?
A: The LM393 comparator output can typically sink up to 16mA, which is sufficient for driving standard LEDs or microcontroller input pins directly.
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