Magnetic Door Switch

This magnetic reed switch is designed to detect whether a door or window is open or closed. It consists of two parts: a magnet and a normally-open (NO) dry contact sensor that changes state when the magnet is in close proximity.

Ideal for home automation, security systems, or alarm projects, it can be interfaced directly with an Arduino, ESP32, or any other microcontroller using a digital input. A pull-up resistor (internal or external) is typically required depending on your wiring configuration.

Specifications

• Component Type: Reed Switch (Normally Open)
• Maximum Voltage: 50 V DC
• Maximum Current: 0.1 A
• Activation Distance: approx. 15–20 mm (depending on magnet strength)
• Compatibility: Arduino, Raspberry Pi, ESP32, STM32, and other microcontrollers