Hall Effect Sensor Module Digital + Analog

The KY-024 Linear Magnetic Hall Sensor Module is a reliable solution for magnetic field detection. When a magnetic field is present, it outputs a high-level signal, making it ideal for RPM sensing (shaft revolution counting), robot speed & distance measurement, door switch sensing, and robot arm position detection. Its adjustable sensitivity and dual outputs (analog & digital) make it easy to integrate with Arduino, Raspberry Pi, and other microcontrollers.

Features

• High-quality S49E Hall sensor
• Wide-range voltage comparator LM393
• Adjustable sensitivity via onboard potentiometer
• Signal output indicator LED
• Both Analog (AO) and Digital (DO) outputs

Connection Diagram

Power: Connect VCC (+) to +5V and GND (-) to Arduino GND.
Digital: Connect D0 to Arduino Pin 3.
Analog: Connect A0 to Arduino A0.

• KY-024 A0 → Arduino A0
• KY-024 G → Arduino GND
• KY-024 + → Arduino +5V
• KY-024 D0 → Arduino Pin 3

Specifications

• Power Supply: 2.3V – 5.3V DC
• Supply Current: < 9mA (LED off)
• Output: Open collector, sinks up to 20mA
• Magnetic Sensitivity: 50 – 350 Gauss
• Sensing Distance: Depends on magnet strength
• Dimensions: 27.0mm × 15.5mm
• Mounting Holes: 2.0mm
• Connector: 4-Pin 0.1" header (VCC, GND, DO, AO)

Typical Applications

• RPM sensors for shafts, motors, and wheels
• Robot speed and distance measurement
• Door/open-close detection for security systems
• Robot arm/joint position sensing
• General-purpose magnetic field detection in DIY and educational projects

Note:

• AO provides a continuous analog output proportional to magnetic field strength.
• DO is a digital “alarm” output that toggles when the field crosses the threshold set by the onboard multi-turn potentiometer.