A3144 Hall Effect Sensor Module 4 Pin

The A3144 Hall Effect Sensor Module is a versatile magnetic field detection module built around the A3144 Hall Effect sensor IC, designed for non-contact magnetic sensing in a wide range of electronics and automation projects. This digital output module detects the presence of a magnetic field and provides a clean logic-level output signal, making it ideal for proximity sensing, speed measurement, position detection, and rotary encoding applications.

The module features an onboard voltage regulator and signal conditioning circuitry, providing stable and reliable digital output compatible with 3.3V and 5V microcontrollers including Arduino, Raspberry Pi, ESP32, and STM32 without additional signal conditioning. A built-in power indicator LED confirms the module is active, while an optional digital output indicator LED provides visual confirmation of magnetic field detection, making debugging and testing straightforward.

With its four-pin interface (VCC, GND, Digital Output, and Analog Output), this module provides flexibility for both digital threshold-based detection and analog signal monitoring. The compact PCB design with mounting holes allows easy integration into any project enclosure or chassis. Common applications include RPM measurement for motors, brushless motor commutation, proximity switches, door open/close detection, gear tooth sensing, and anti-lock braking systems. The A3144 responds to unipolar magnetic fields, triggering on the south pole of a magnet, making it predictable and reliable for precise sensing applications.

Specification :

• IC Chip: A3144 Hall Effect Sensor
• Output Type: Digital (active LOW) + Analog output
• Pin Count: 4 pins (VCC, GND, DO, AO)
• Operating Voltage: 3.3V – 5V DC
• Operating Current: ~5mA typical
• Output Voltage (High): VCC – 0.5V
• Output Voltage (Low): < 0.4V
• Detection Type: Unipolar magnetic field (south pole)
• Sensing Range: Up to 1cm (depends on magnet strength)
• Operating Temperature: -40°C to +150°C
• Output Configuration: Open-collector with pull-up resistor
• Response Frequency: Up to 10kHz
• Indicators: Power LED + Digital output indicator LED
• PCB Dimensions: Approximately 30mm × 14mm
• Mounting: Onboard mounting holes
• Pin Pitch: 2.54mm standard header
• Compatible Platforms: Arduino, Raspberry Pi, ESP8266, ESP32, STM32, PIC
• Applications: RPM sensing, proximity detection, gear tooth counting, door sensors, motor control