Hall Effect Magnetic Sensor Module

Overview

The Hall Effect Magnetic Sensor Module (A3144) is a high-precision digital magnetic switch module engineered to detect the presence, proximity, and strength of magnetic fields with absolute reliability. Built around the proven A3144 Hall-effect semiconductor paired with an onboard LM393 voltage comparator, this module offers both a clean Digital Output (DO) and an Analog Output (AO). An onboard sensitivity potentiometer allows users to calibrate the exact magnetic threshold required to trigger the digital output. Free from mechanical wear, bounce, and physical contact, it is the industry standard for non-contact speed measurement (tachometers), door limit switches, and brushless motor commutation in Arduino and robotics systems.

Key Features

• Non-Contact Magnetic Sensing: Detects magnetic fields without mechanical contact, eliminating wear and tear over millions of switching cycles.
• Dual Analog & Digital Outputs: Use DO for immediate digital interrupt triggers or AO to measure relative magnetic field strength.
• Adjustable Sensitivity Trimpot: Calibrate switching sensitivity on the fly to match varying magnet sizes and operating air gaps.
• Clean LM393 Comparator Output: Provides sharp, noise-free TTL logic signals compatible directly with microcontrollers.
• Integrated Visual Indicators: Onboard LEDs provide instant visual verification of power input and magnetic field trigger events.
• Broad Microcontroller Compatibility: Operates seamlessly across 3.3V and 5V logic families (Arduino, ESP32, STM32, Raspberry Pi).

Technical Specifications

• Operating Voltage: 3.3V – 5.0V DC
• Sensor IC: A3144 Hall-Effect Switch
• Comparator Chipset: LM393
• Output Types: Digital DO (Active-Low / High) & Analog AO (Voltage proportional to field)
• Switching Frequency: Up to 100 kHz (supports high-speed RPM counting)
• Operating Temperature: -40°C to +85°C
• Board Dimensions: 32 mm × 14 mm × 7 mm
• Mounting Hole: 3 mm screw hole

Applications & Use Cases

• Motor RPM & Tachometers: Counting revolutions per minute on brushless motors, wheels, and machinery using rotating magnets.
• Non-Contact Limit Switches: Detecting the position of 3D printer gantry axes, CNC machine limits, and robotic actuators.
• Door & Window Security Sensors: Detecting opening and closure of doors in home automation and security alarm panels.
• Liquid Flow Meters: Reading paddlewheel rotations inside water and fluid flow meters.
• Bicycle Speedometers: Measuring wheel rotation intervals to calculate road speed and distance traveled.

What's Included

• 1 × Hall Effect Magnetic Sensor Module (with A3144 sensor and LM393 comparator)

Compatibility

• Microcontrollers: 100% compatible with Arduino Uno, Nano, ESP32, ESP8266, STM32, and Raspberry Pi.
• Magnets: Works reliably with all Neodymium (NdFeB) and Ferrite permanent magnets.

MOKWN Recommendation

For high-speed rotational counting like motors and wheels, mechanical limit switches bounce and wear out rapidly. The A3144 Hall effect module handles tens of thousands of RPMs with zero mechanical contact and zero bounce. Pair it with a small neodymium disc magnet on your wheel, and your Arduino will count revolutions flawlessly. Available at MOKWN with express nationwide delivery across Egypt!