Hall Effect Sensor with LM393

The Hall Effect Sensor Module with LM393 is a dual-output magnetic field detection module designed for a wide range of sensing applications. It combines the 49E linear Hall effect sensor, which produces an analog voltage proportional to magnetic field strength, with the LM393 wide-range voltage comparator, which converts that signal into a clean digital output when a configurable threshold is crossed.

The 49E Hall sensor is a high-quality linear ratiometric Hall element that responds to both north and south magnetic poles, with its output voltage shifting up or down from a midpoint based on the polarity and intensity of the detected magnetic field. This makes the module suitable not only for simple presence detection but also for continuous magnetic field strength measurement when used with a microcontroller's ADC.

The LM393 comparator stage gives you a digital (DOUT) signal that toggles when the magnetic field exceeds an adjustable threshold set by the onboard multi-turn potentiometer. A signal LED lights up whenever the digital output is triggered, giving you instant visual feedback during testing and tuning. This dual-output design allows you to use the module either as a simple ON/OFF magnetic switch or as a precise magnetic field analog sensor.

The module operates over a wide voltage range of 3.3V to 5.3V, making it directly compatible with Arduino, ESP32, ESP8266, STM32, Raspberry Pi, and PIC microcontrollers. Its compact 29.2 × 11.2 mm form factor includes 2.0mm mounting holes for easy installation in any project, robot, or enclosure.

Whether you're building a wheel encoder for a smart car, detecting the position of a magnetic actuator, monitoring motor RPM, or creating an interactive electronic brick project, this Hall effect sensor module gives you reliable, microcontroller-friendly output with minimal effort and excellent flexibility.

Specifications

• Sensor Type: Linear Hall Effect Sensor with Comparator
• Hall Sensor IC: 49E Linear Hall Sensor
• Comparator IC: LM393 Wide-Range Voltage Comparator
• Operating Voltage: 3.3V – 5.3V
• Output Type:
  • AOUT: Analog voltage (proportional to magnetic field strength)
  • DOUT: Digital signal (TTL, triggered by adjustable threshold)
• Sensitivity Adjustment: Onboard multi-turn potentiometer
• Indicators: Power LED + Signal output LED
• Module Dimensions: 29.2 mm × 11.2 mm
• Mounting Holes: 2.0 mm diameter
• Weight: 0.005 kg (5 g)
• Pin Layout: VCC, GND, DOUT, AOUT

MCU Wiring

• VCC ↔ 2.3V ~ 5.3V
• GND ↔ Power supply ground
• AOUT ↔ MCU analog input pin (ADC)
• DOUT ↔ MCU digital input pin (GPIO)

Applications

• Motor speed measurement (RPM) using a magnet attached to a rotating shaft
• Wheel encoders for smart cars and robots to track distance and speed
• Object position detection using magnetic markers
• Door and window sensors for home security and automation
• Brushless motor commutation in DIY motor controller projects
• Magnetic switch replacements for reed switches in robotics and automation
• Tachometers for measuring rotational speed of fans, motors, and turbines
• Liquid level sensing with floating magnetic indicators
• Smart car kits for line-following and speed feedback
• Educational electronic brick kits for teaching sensors and microcontrollers
• Magnetic field strength measurement for science experiments and STEM projects
• Industrial position sensing in conveyor belts and linear actuators
• Anti-tamper detection in security and access-control devices
• Pinball and arcade game projects for ball detection
• Automatic gate and barrier controllers
• Hall-effect joysticks and game controllers for analog input
• Linear position sensing in 3D printers and CNC machines