Description
4-Pin Linear Magnetic Hall Switch Speed Counting Sensor Module for Arduino
Product Description
The 4-Pin Linear Magnetic Hall Switch Sensor Module is a compact, reliable, and easy-to-use sensor designed for Arduino, ESP32, STM32, and other microcontrollers.
Using Hall effect technology, this module detects changes in magnetic fields and converts them into a corresponding voltage signal. It can be used for speed measurement, motor position sensing, rotation counting, and proximity detection.
With its linear response and 4-pin interface (VCC, GND, DO, AO), this sensor provides both digital (DO) and analog (AO) outputs, making it versatile for a wide range of DIY electronics and embedded projects.
Key Features
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Hall Effect Linear Sensor – Detects magnetic fields and outputs proportional signals 
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Dual Output – Digital output for on/off detection, analog output for linear measurements 
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Adjustable Sensitivity – On-board potentiometer for fine-tuning threshold 
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4-Pin Interface – VCC, GND, DO, AO for easy integration 
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Wide Supply Range – 3.3V to 5V, compatible with Arduino & ESP boards 
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On-board LED Indicator – Visual status for digital output trigger 
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Compact PCB Design – Easy to mount in projects 
Technical Specifications
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Operating Voltage: 3.3V – 5V DC 
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Output Pins: AO (Analog), DO (Digital), VCC, GND 
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Sensor Type: Linear Hall Effect IC 
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Adjustable Sensitivity: Yes (via potentiometer) 
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Indicator: Power and digital output LED 
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Applications: Speed counting, motor RPM measurement, magnetic field detection, proximity sensing 
How to Use
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Connect VCC to 3.3V–5V, GND to ground. 
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AO pin gives an analog voltage proportional to magnetic field strength. 
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DO pin provides a digital HIGH/LOW signal based on threshold set by potentiometer. 
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Use with Arduino’s analogRead() for linear values or digitalRead() for binary detection. 
Applications
✔️ Motor speed & RPM measurement
✔️ Magnetic switch detection
✔️ Proximity sensing
✔️ Object counting systems
✔️ Robotics & automation
✔️ DIY Arduino/ESP projects
Package Includes
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1 × 4-Pin Linear Magnetic Hall Switch Speed Counting Sensor Module 












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