Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	A3144
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch (Open Collector)
Compatibility	Arduino, micro:bit, Raspberry Pi
Sensing Range	Approx. 10mm
LED Indicator	Yes (Power and Output Status)
Mounting Hole Diameter	3mm
PCB Dimensions	32mm x 14mm
Application	Speed Measurement, Counting, Position Detection
Package Includes	1x Hall Sensor Module

6 reviews

Anonymous

Mar 22, 2026

Rating: 4/5

Easy to use for beginners

As someone new to electronics, I found this very straightforward to connect. The three pins are clearly labeled. Just remember you need a pull-up resistor if your board doesn't have one internally.

Anonymous

Mar 18, 2026

Rating: 5/5

Solid build quality

The PCB looks clean and the soldering is good. No issues with noise or false triggers in my testing environment. Highly recommended for hobbyists.

Anonymous

Mar 17, 2026

Rating: 4/5

Great value for learning

Bought this for a school project involving the micro:bit. It was easy to wire up and detect magnets. Only giving 4 stars because the documentation could be slightly better, but plenty of examples online.

Anonymous

Mar 09, 2026

Rating: 5/5

Exactly as described

Fast shipping and the product matches the description perfectly. Works great for counting revolutions on my 3D printer fan upgrade.

Anonymous

Mar 07, 2026

Rating: 5/5

Perfect for my RPM counter project

This module worked flawlessly with my Arduino Uno. I used it to measure the speed of a small DC motor, and the readings were consistent. The LED indicator is very helpful for debugging.

Anonymous

Mar 04, 2026

Rating: 5/5

Reliable and sensitive

I've tested several hall sensors, and this A3144 module is very responsive. It detects the magnet from a decent distance, which helps when mounting it inside a chassis.

5 FAQ

Q: Does this module work directly with 3.3V logic like the ESP32?

A: Yes, the module operates within a 3.3V to 5V range, making it fully compatible with 3.3V microcontrollers like the ESP32 and micro:bit without needing level shifters.

Q: Is a magnet included in the package?

A: No, the package includes only the Hall sensor module. You will need to provide your own magnet for testing or integration into your project.

Q: Can I use this to detect gear teeth on a metal wheel?

A: This specific module detects magnetic fields, not metal directly. To detect gear teeth, you would need to attach a small magnet to the rotating gear or use a ferrous metal detection setup with a magnet placed behind the sensor.

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

A: The A3144 chip typically handles up to 25mA. For driving higher current loads like relays or bright LEDs, we recommend using a transistor or MOSFET between the module output and the load.

Q: How do I connect this to an Arduino?

A: Connect the VCC pin to 5V, GND to Ground, and the OUT pin to any digital input pin on your Arduino. You can then read the HIGH/LOW state in your code to detect the presence of a magnet.

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