Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	Hall Effect (A3144)
Operating Voltage	4.5V - 24V DC
Output Signal	Digital Switching (Open Collector)
Detection Range	0mm - 10mm (depends on magnet strength)
Response Frequency	Up to 25 kHz
LED Indicator	Yes, indicates magnetic field detection
Mounting Hole Diameter	3.5 mm
PCB Dimensions	32mm x 14mm x 4mm
Connector Type	3-Pin PH2.0 Header
Application	Speed measurement, RPM counting, position sensing

6 reviews

Anonymous

Mar 28, 2026

Rating: 5/5

Reliable counting sensor

I built a conveyor belt counter using this module. It has been running for three weeks without missing a single count. The response time is incredibly fast.

Anonymous

Mar 25, 2026

Rating: 5/5

Compact and efficient

Small form factor fits easily into tight enclosures. The voltage range is wide enough for both 5V logic and 12V automotive testing. Very satisfied with this purchase.

Anonymous

Mar 16, 2026

Rating: 5/5

Great for university projects

Used this for my final year project on automotive speed simulation. The A3144 chip is industry-standard, and this breakout board makes it easy to prototype. Highly recommended.

Anonymous

Mar 08, 2026

Rating: 4/5

Good value, clear instructions needed

The hardware quality is solid for the price. It detected the magnet instantly. I deducted one star because there were no printed wiring diagrams included, but a quick online search solved the pinout confusion.

Anonymous

Mar 06, 2026

Rating: 4/5

Solid performance

We bought ten of these for our workshop. Nine worked perfectly out of the box. One had a slightly loose header pin, but it was easily soldered back in place. Overall great batch.

Anonymous

Mar 01, 2026

Rating: 5/5

Perfect for Arduino RPM projects

This sensor 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 the magnetic field range.

5 FAQ

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

A: The A3144 sensor output is typically rated for around 25mA. It is designed for signal logic, not for driving high-power loads directly. Use a transistor or relay for higher currents.

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

A: Yes, but ensure you operate the sensor at 5V and use a pull-up resistor on the output pin if your specific setup requires it, as the output is open-collector.

Q: Does this module come with a magnet?

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

Q: Can this detect north and south poles differently?

A: No, the standard A3144 unipolar switch generally responds to a single magnetic polarity (usually South). For detecting both poles distinctly, you would need a bipolar latch sensor.

Q: Is the output active high or active low?

A: The output is active low. When a magnetic south pole is detected near the front of the sensor, the output pulls to ground (LOW). Otherwise, it remains high impedance (requires pull-up).

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