Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	3144
Output Type	Digital Switch
Operating Voltage	4.5V - 24V DC
Operating Current	Max 25mA
Output Current	25mA Max
Operating Temperature	-40°C to +85°C
Pin Configuration	3-Pin (VCC, GND, OUT)
Sensing Range	Up to 10mm (depending on magnet)
Package Type	TO-92 with PCB Module
Application	Motor Speed, RPM Counting, Position Sensing

6 reviews

Anonymous

Mar 26, 2026

Rating: 5/5

Reliable speed sensing

I installed two of these on my smart car chassis to monitor wheel speed. They are responsive and haven't failed even after weeks of testing. Highly recommend for hobbyist robotics.

Anonymous

Mar 23, 2026

Rating: 4/5

Stable performance

Used these in a classroom setting for student projects. They are durable and consistent. The only minor issue is that the LED indicator is quite bright at night, but that's trivial.

Anonymous

Mar 22, 2026

Rating: 5/5

Perfect for Arduino Projects

This 3144 module worked flawlessly with my Arduino Uno. I used it to measure the RPM of a small DC motor, and the digital output was clean and easy to read. The documentation included was helpful for wiring.

Anonymous

Mar 13, 2026

Rating: 4/5

Good value, works as expected

Solid sensor for the price. It detects magnets reliably within a reasonable distance. I deducted one star because the soldering points on the PCB were a bit small for thick wires, but otherwise great.

Anonymous

Mar 05, 2026

Rating: 5/5

Great for tachometer builds

Built a custom tachometer for a model engine using this sensor. The response time is excellent, and it handles high-frequency switching without dropping pulses. Very satisfied.

Anonymous

Mar 05, 2026

Rating: 5/5

Easy to use for beginners

As someone new to electronics, I appreciated how simple this module is. Just three pins and it works immediately. The included guide explained the polarity clearly.

5 FAQ

Q: What is the maximum switching frequency?

A: The 3144 Hall effect switch typically supports switching frequencies up to several kHz, which is sufficient for most motor speed and RPM applications.

Q: Can this be used directly with a 5V Raspberry Pi GPIO?

A: Yes, the module operates between 4.5V and 24V, so it is fully compatible with 5V Raspberry Pi GPIO pins. Ensure you connect the ground common to both devices.

Q: Is the output active high or active low?

A: The output is active low. When a magnetic south pole is detected near the sensing face, the output pin goes to a low state (GND).

Q: Can this sensor detect north poles?

A: The standard 3144 unipolar switch generally responds to a single magnetic pole (usually South). For detecting both poles, you would need a bipolar latch version, though some variants may vary slightly by manufacturer.

Q: Does this module come with a magnet?

A: No, this package includes only the 3144 sensor module and documentation. You will need to provide your own magnet for operation.

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