A3144 Hall Effect Switch + magnet
by Allegro / clone
SKU: PSA-CMP-HALL-A3144
No reviews yetTypical India street price
₹15–₹40
Magnet-activated switch — RPM, door, contactless bumper.
Interface: Open-collector digital
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Concept
A Hall IC turns on near a south-pole magnet.
A little theory
Open collector needs a pull-up. Unipolar A3144 vs analog 49E. In the classroom, treat A3144 Hall Effect Switch + magnet as a beginner part using Open-collector digital. Typical India street price is about ₹15–₹40. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
INPUT_PULLUP, magnet near the branded face, count pulses for RPM.
Classroom & project use
- Wheel tachometer
- Cabinet door
- BLDC timing demo
Buying in India
Precautions
- Check 3.3 V MCU compatibility before connecting signal pins
- Share a common GND with the microcontroller
Specifications
| Chip | A3144 |
| Output | Digital OC |
| Category | Sensors |
| Difficulty | Beginner |
| Voltage | 4.5–24V (5 V typical) |
| Interface | Open-collector digital |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
