Magnetic Reed Switch Sensor Module, 3.3V–5V Digital Output

This magnetic reed switch sensor module is a compact digital switch designed for non-contact proximity and limit detection. When brought near a magnetic field, the internal contacts close to deliver a clean digital signal. It is ideal for students, hobbyists, and makers building alarm systems, door monitors, and counting mechanisms.

Magnetic sensing operation

The module contains a sealed glass tube with internal contacts surrounded by inert gas. When a magnetic field enters the 1.5 cm working range, the contacts close and pull the digital output low, switching back to high once the magnet is removed.

Compact design and mounting

Measuring just 3.2 x 1.9 x 0.7 cm and weighing 4 g, the module includes a dedicated fixed bolt hole for secure mounting on chassis, frames, or enclosures. It operates reliably on supply voltages ranging from 3.3 V to 5 V.

Typical applications

This sensor is commonly used in security systems for door and window monitoring. It is also suitable for limit switching, pulse counting, and various communication device applications.