Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	YS-27/3144E
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch Output (DO)
Detection Object	Magnetic Fields
PCB Dimensions	32mm x 14mm
Mounting Hole Diameter	3mm
Indicator LED	Yes (Power and Detection)
Comparator Chip	LM393
Sensitivity Adjustment	Potentiometer Included
Application	Speed Counting, Position Detection

6 reviews

Anonymous

Mar 21, 2026

Rating: 4/5

Solid performance

Does exactly what it says on the tin. Detects magnetic fields and switches the output pin. I wish the connecting wires were pre-soldered, but soldering them myself wasn't difficult.

Anonymous

Mar 17, 2026

Rating: 5/5

Reliable and compact

I integrated this into a custom 3D printed enclosure for a conveyor belt counter. The form factor is small enough to fit tight spaces, and the mounting holes are standard size. Very happy with the purchase.

Anonymous

Mar 13, 2026

Rating: 4/5

Good value, clear instructions needed

The hardware quality is solid for the price. It detected magnets instantly. However, beginners might struggle slightly without a pinout diagram included in the package, but a quick online search solves that. Works great for speed detection.

Anonymous

Mar 10, 2026

Rating: 5/5

Great for university projects

Bought five of these for a final year project involving wheel speed monitoring. All units performed consistently. The LED indicator is bright and helpful for debugging during setup.

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect for Arduino RPM projects

This Hall sensor module worked flawlessly with my Arduino Uno. I used it to count the rotations of a small DC motor, and the output signal was clean and stable. The potentiometer makes it easy to adjust sensitivity for different magnet strengths.

Anonymous

Mar 01, 2026

Rating: 5/5

Excellent sensitivity control

The onboard potentiometer allows for precise tuning. I was able to ignore weak background magnetic interference and only trigger on the specific neodymium magnet I attached to my gear. Highly recommended.

5 FAQ

Q: Can this module work directly with a Raspberry Pi GPIO?

A: Yes, since the module operates at 3.3V to 5V and provides a digital output, it is compatible with Raspberry Pi GPIO pins. Just ensure you connect the VCC to the 3.3V or 5V pin accordingly.

Q: What is the maximum detection distance for a standard magnet?

A: The detection distance depends on the strength of the magnet and the sensitivity setting via the potentiometer. Typically, with a standard neodymium magnet, it can detect within 10mm to 20mm.

Q: Can I use this to detect iron objects without a magnet?

A: No, this is a Hall Effect sensor designed specifically to detect magnetic fields. It will not detect non-magnetized iron or steel objects unless they are magnetized or used in conjunction with a magnet.

Q: Does this come with jumper wires?

A: The module typically comes as a standalone PCB without jumper wires. You will need to solder your own headers or wires to connect it to your microcontroller.

Q: Is the output HIGH or LOW when a magnet is detected?

A: By default, the output goes LOW when a magnet is detected and HIGH when no magnet is present. This logic can be inverted if you modify the circuit, but the standard configuration is active-low.

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