Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	3144
Operating Voltage	DC 5V
Output Type	Digital Switch (Open Collector)
Sensing Element	Allegro A3144 Hall Effect IC
LED Indicator	Yes, Power and Output Status
Mounting Hole Diameter	3.0 mm
PCB Dimensions	32mm x 14mm
Response Time	< 4 µs
Operating Temperature	-40°C to +85°C
Application	Motor Speed Measurement, RPM Counting, Position Sensing

6 reviews

Anonymous

Mar 26, 2026

Rating: 4/5

Works well but magnet distance matters

Functionality is great, but you need to be precise about the gap between the sensor and the magnet. Once I adjusted the mounting bracket to get the gap under 5mm, it worked perfectly every time.

Anonymous

Mar 25, 2026

Rating: 5/5

Great for university projects

Used this for my final year engineering project involving wheel rotation counting. It was easy to interface with Raspberry Pi GPIO pins. Highly recommended for students.

Anonymous

Mar 21, 2026

Rating: 4/5

Good value, clear instructions needed

The sensor itself is high quality and responds instantly to magnets. I deducted one star because there were no printed instructions included, but a quick search online provided all the wiring diagrams I needed.

Anonymous

Mar 18, 2026

Rating: 5/5

Perfect for Arduino RPM projects

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

Anonymous

Mar 12, 2026

Rating: 5/5

Compact and efficient

Small form factor fits easily into tight enclosures. The voltage regulation on the board handles slight fluctuations well. Excellent purchase for the price point.

Anonymous

Mar 01, 2026

Rating: 5/5

Reliable industrial prototype component

Bought five of these for a prototype conveyor belt counter. They have been running continuously for two weeks without any false triggers. The build quality of the PCB is solid.

5 FAQ

Q: How do I adjust the sensitivity of the detection?

A: This specific 3144 model does not have an adjustable potentiometer. Sensitivity is determined by the strength of the magnet and the physical distance between the magnet and the sensor face.

Q: Is the magnet included in the package?

A: No, the magnet is not included. You will need to provide your own permanent magnet to trigger the Hall effect sensor.

Q: Does this module output an analog voltage or a digital signal?

A: This module outputs a digital signal. It acts as a switch that goes LOW when a magnetic field is detected and HIGH otherwise.

Q: Can I use this with a 3.3V microcontroller like ESP32?

A: Yes, while the module is rated for 5V, it generally functions correctly at 3.3V logic levels. However, for optimal stability and LED brightness, 5V operation is recommended with a level shifter if necessary.

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

A: The open-collector output can typically sink up to 25mA. For driving higher current loads like relays or large motors, we recommend using a transistor or MOSFET driver circuit.

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