Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	A3144
Operating Voltage	4.5V - 24V DC
Output Type	Digital Switch (Open Collector)
Compatibility	Arduino, Raspberry Pi, 51 MCU
Sensing Range	Up to 25mm (depending on magnet strength)
Response Time	< 4 µs
Operating Temperature	-40°C to +85°C
Pin Configuration	3-Pin (VCC, GND, OUT)
PCB Dimensions	18mm x 12mm x 3mm
Package Includes	1x A3144 Sensor Module, 1x Magnet

6 reviews

Anonymous

Mar 26, 2026

Rating: 4/5

Works as expected

Simple plug-and-play experience. Connected VCC to 5V, GND to ground, and the output to a digital pin. The LED on the board lights up when a magnet is detected, which is a nice visual indicator for debugging. Would buy again.

Anonymous

Mar 20, 2026

Rating: 5/5

Great for learning electronics

I am using this with a Raspberry Pi 4 for a university project. The documentation online is plentiful, and this specific module matched all the tutorials perfectly. It detects the magnetic field instantly when I bring the magnet close.

Anonymous

Mar 15, 2026

Rating: 5/5

Excellent sensitivity

The A3144 chip on this module is genuine and performs according to the datasheet. I tested the switching threshold, and it is very accurate. Great component for industrial prototyping or hobbyist projects alike.

Anonymous

Mar 11, 2026

Rating: 5/5

Perfect for my Arduino speedometer project

This sensor works flawlessly with my Arduino Uno. I used it to count wheel rotations for a DIY bicycle speedometer. The response time is incredibly fast, and the included magnet is strong enough to trigger it reliably from a few centimeters away. Highly recommended for beginners.

Anonymous

Mar 03, 2026

Rating: 4/5

Good value, easy to integrate

Bought five of these for a line-following robot that detects magnetic tape. They are very consistent. The only reason for 4 stars instead of 5 is that the soldering pads are a bit small, so you need a steady hand if you aren't using header pins.

Anonymous

Mar 02, 2026

Rating: 5/5

Reliable and robust

I've been running this sensor in an outdoor enclosure for two weeks now to monitor a gate opening. Despite some temperature fluctuations, it hasn't missed a beat. The build quality feels solid for the price point.

5 FAQ

Q: Does the package include the magnet shown in the pictures?

A: Yes, each order includes one small cylindrical magnet specifically paired with the sensor module for immediate testing and integration.

Q: What is the maximum distance the magnet can be from the sensor to trigger it?

A: The detection distance depends heavily on the strength of the magnet used. With the included small magnet, reliable triggering usually occurs within 10mm to 15mm. Stronger neodymium magnets can increase this range up to 25mm.

Q: Is the output analog or digital?

A: This is a digital switch module. The output pin goes LOW when a magnetic south pole is detected near the front of the sensor and stays HIGH otherwise. It does not provide an analog voltage proportional to the field strength.

Q: Does this module work with 3.3V logic levels like the Raspberry Pi GPIO?

A: Yes, the module operates between 4.5V and 24V for power, but the output is open-collector. You can use it with 3.3V systems like Raspberry Pi by powering the module at 5V and using a pull-up resistor to 3.3V on the output line, or simply rely on the internal pull-ups if your configuration supports it safely.

Q: Can I use this to measure RPM of a motor?

A: Absolutely. By attaching a small magnet to the rotating shaft and placing this sensor nearby, you can count the pulses per minute to calculate RPM. This is a very common application for the A3144 sensor.

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