The A3144 Hall Effect Sensor Module is a magnetic field detection module used to sense the presence of a magnet. It provides a digital output that changes state when a magnetic field of sufficient strength is detected. This module is widely used in speed sensing, position detection, proximity sensing, and motor control applications due to its reliability and simple interface.
Core Sensor Specifications
• Sensor Type: Hall effect magnetic sensor
• Sensor IC: A3144
• Detection Type: Magnetic field (north pole detection)
• Output Type: Digital (ON / OFF)
Electrical & Interface
• Operating Voltage: 3.3 V – 5 V
• Logic Level: TTL compatible
• Interface Pins: VCC, GND, DO
• Output Mode: Open-collector (requires pull-up)
• Response Polarity: Active LOW when magnet detected
Performance Characteristics
• Fast switching response
• Stable digital output
• High sensitivity to magnetic fields
• Reliable operation over long periods
Physical Characteristics
• Module Type: PCB-mounted Hall sensor
• Sensor Package: TO-92 (mounted on module)
• Compact and lightweight design
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• STM32, AVR, PIC microcontrollers
• Raspberry Pi GPIO
Key Advantages
• Simple digital interface, no ADC required
• Long operational life with no mechanical wear
• Works reliably in dusty or oily environments
• Low power consumption
Technical Insights
• Output goes LOW when a magnetic field is detected
• Requires a pull-up resistor for correct operation
• Sensitivity depends on magnet strength and distance
• Not suitable for analog magnetic field measurement
Applications
• Speed and RPM measurement
• Door and window magnetic switches
• Proximity sensing
• Motor position detection
• DIY electronics and automation projects
Pro Tip
• Use a strong neodymium magnet for consistent triggering
• Adjust distance between magnet and sensor for sensitivity tuning
• Use interrupt pins for accurate speed or RPM measurement
Package Includes
• 1 × A3144 Hall Effect Sensor Module