Description
Reviews
| 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 |
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.
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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