Linear Hall Effect Sensor Module with LM393 Comparator

The 49E Linear Hall Effect Sensor Module is a high-sensitivity magnetic field detection board engineered for measuring magnetic strength and proximity. Featuring a linear 49E Hall-effect sensor coupled with an onboard LM393 voltage comparator, it delivers simultaneous dual outputs: a real-time analog voltage proportional to magnetic flux density, and a clean digital switching signal with adjustable sensitivity.

Compatible with 3.3V and 5V microcontrollers like Arduino, ESP32, STM32, and Raspberry Pi, it is a practical solution for non-contact position sensing, tachometers, motor commutation, and magnetic limit switches.

Key Specifications

• Hall Sensor Element: 49E (SS49E) Linear Hall Effect Sensor

• Comparator IC: LM393 dual differential voltage comparator

• Operating Voltage: 3.3V to 5V DC (operates up to 5.3V)

• Output Types: Dual Output — Analog (AO) and Digital (DO)

• Analog Output: Proportional to magnetic field strength (~VCC/2 at zero field; ramps up for South pole, ramps down for North pole)

• Digital Output: High/Low logic threshold adjustable via onboard multi-turn potentiometer

• Status Indicators: Onboard Power LED and Digital Output Detection LED

• Pin Pitch: Standard 2.54mm through-hole header

Common Applications

• Non-contact rotational speed (RPM) measurement and tachometer systems

• Motor shaft position sensing and brushless motor commutation feedback

• Magnetic door/window proximity alarms and limit switches

• Current sensing via magnetic fields and contactless current monitoring

Pinout Guide

• VCC: 3.3V – 5V Power Supply

• GND: Power ground (0V)

• DO (Digital Out): Digital switching output (connects to MCU digital interrupt/GPIO pin)

• AO (Analog Out): Linear analog voltage output (connects to MCU ADC pin)