A3144 Hall Effect Sensor Module – Unipolar Magnetic Switch
A3144 Hall Effect Sensor Module – Unipolar Magnetic Switch for Position and Speed Sensing
The A3144 Hall Effect Sensor Module is a digital magnetic switch built around the A3144 unipolar Hall effect IC. It detects the presence of a magnetic South pole and outputs a logic low signal. This makes it ideal for non-contact position sensing, RPM measurement, and proximity detection in robotics and automation projects.
Key Specifications
| Specification | Value |
|---|---|
| IC | A3144 |
| Type | Unipolar Hall Effect Sensor |
| Output | Digital, active low (0V when South pole detected) |
| Supply Voltage | 4.5V – 24V DC (module typically operated at 5V) |
| Quiescent Current | ~10 mA |
| Dimensions | 15 mm × 10 mm (approx.) |
What You Can Build With This
- Bicycle or motor RPM counter using a magnet on the wheel
- Magnetic door or window open/close sensor for security systems
- Limit switch replacement in CNC machines or 3D printers
- Proximity detector to trigger actions when a magnet comes near
Compatibility
This module works directly with any microcontroller that has 5V tolerant digital inputs, such as Arduino Uno, Mega, and Nano. It can also be used with 3.3V boards like ESP32, ESP8266, or Raspberry Pi Pico if you add a level shifter or voltage divider on the output to avoid overvoltage on the GPIO pin.
Wiring Notes
Connect VCC to 5V, GND to ground, and OUT to a digital input pin. The module includes an onboard pull-up resistor on the open-collector output, so no external components are needed. For 3.3V systems, power the module from 5V and use a 10kΩ/20kΩ voltage divider on the OUT pin to step the signal down to 3.3V.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino Uno?
Yes, it works without additional components. Wire VCC to 5V, GND to GND, and OUT to any digital pin. The onboard pull-up ensures a clean high signal when no magnet is present.
How close does the magnet need to be?
Detection distance varies with magnet strength. A typical neodymium disc magnet (10×3 mm) triggers the sensor from 5–10 mm away. For reliable operation, mount the magnet within this range.
Can I use this with a 3.3V microcontroller?
Yes, but with caution. Power the module at 5V and use a voltage divider (e.g., 10kΩ from OUT to GPIO, 20kΩ from GPIO to GND) to step the output down to a safe 3.3V level. Do not power the module at 3.3V, as the sensor requires at least 4.5V to operate reliably.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items