KY-025 Magnetic Reed Switch Sensor Module

The KY-025 Magnetic Reed Switch Sensor Module detects nearby magnetic fields, providing both digital switching output (0 and 1) and analog output, operating from 3.3V to 5V DC. The reed switch sensor at the heart of this module is a sealed glass tube containing two thin ferromagnetic contacts that physically bend together and touch when a magnet comes close, completing the circuit — this mechanical switching action requires no power at all; only the LM393-based comparator circuitry on the KY-025 board needs power to convert the switch state into a clean digital signal.

The ky 025 reed switch module’s digital output gives a simple HIGH/LOW signal when a magnet enters or leaves detection range, ideal for door and window open/close sensors, security alarm triggers, and reed-switch based RPM counting where a magnet attached to a rotating wheel triggers the reed switch once per revolution. The magnetic reed switch sensor’s analog output, less commonly used, can give a graduated reading useful for distinguishing different magnet proximity distances rather than just a binary trigger. As a ky025 reed sensor, the onboard LM393 comparator allows adjusting detection sensitivity via the threshold potentiometer.

Reed switches have a finite mechanical contact life and can wear out after very high-frequency repeated triggering (such as fast RPM counting over extended periods), unlike solid-state Hall effect sensors with no moving parts. Well-suited for students, this KY-025 module available at StemVolt enables smart monitoring, proximity sensing, and IoT projects using responsive magnetic reed switch.

Related Product:

• Checkout The Metal Detector Sensor Module

Features:

• Sealed glass reed switch needs no power for magnetic detection
• LM393 comparator gives clean digital HIGH/LOW switching signal
• Onboard potentiometer adjusts magnetic detection sensitivity threshold
• Both digital and analog outputs for binary or graduated readings
• 3.3V to 5V compatible with Arduino and similar microcontrollers

Pin Diagram of KY-025 Reed Sensor Mosule:

Technical specifications:

 Applications:

• KY-025 Module used for Arduino door window open alert build
• College project uses reed switch sensor for magnetic detection demo
• Security system uses ky 025 reed switch for India home alarm trigger
• Robot uses magnetic reed switch sensor for wheel RPM counting build
• DIY project uses ky025 reed sensor for proximity detection circuit

Package includes:

• 1 x KY-025 Magnetic Reed Switch Sensor Module