This module integrates a Linear Hall Effect Sensor (like the SS49E) with an onboard comparator (usually an LM393) to provide a clean digital (ON/OFF) output in addition to the sensor's raw analog output. It is designed to function as a non-contact magnetic switch, perfect for applications requiring speed counting, position detection, or RPM measurement. The key feature is the onboard potentiometer, which allows you to precisely adjust the magnetic field threshold at which the digital output switches state.

Specifications

• Sensor Chip: Linear Hall Effect Sensor (SS49E or equivalent)
• Comparator Chip: LM393 Dual Differential Comparator or equivalent <button></button>
• Output Type: Dual Output
  • Analog (AO): Raw linear voltage output from the sensor
  • Digital (DO): Clean ON/OFF signal from the comparator
• Operating Voltage: DC 3V to 5V <button></button>
• Interface: 4-pin interface (VCC, GND, AO, DO) <button></button>
• Key Components: Onboard power indicator LED and comparator output status LED
• Adjustment: Multi-turn potentiometer for threshold calibration

Features

• Adjustable Sensitivity: The onboard potentiometer allows the user to fine-tune the magnetic field strength required to trigger the digital switch.
• Non-Contact Switching: Detects ferrous or magnetic objects without physical contact, minimizing wear and tear.
• Dual Output: Provides both a highly accurate analog signal and a simplified digital signal for maximum versatility.
• Common Applications:
  • RPM and speed measurement (using a magnetized wheel)
  • Non-contact limit or proximity switch
  • Position sensing and tracking
  • Simple magnetic intrusion detection

Tutorial: ElectroNoobs (Reference only)