Monitor Your Door Using Magnetic Reed Switch and Arduino | Random Nerd Tutorials
Basics: Project 030a Reed switch, LEDs, active piezo buzzer - magnetic field detection switch at Lex C / ACOPTEX.COM
5pcs/lot Reed Switch Sensor Module Magnetic Switch Magnetron Module For Arduino SPC exchange gas meter water meter etc|module switch|module for arduinomodule sensor - AliExpress
Normally Open Reed Sensor Module Magnetic Switch for Arduino 3.3 V-5 V
Mini Magnetic Smart Car Reed Switch Sensor Module for Arduino
Arduino Reed Switch (magnet sensor) with LED - YouTube
Arduino Reed Switch Interfacing Tutorial
1 pcs Reed Sensor Magnetron Module Reed Switch Magnetic Switch For Arduino | eBay
How to Use a Magnetic Door Switch / Sensor With Arduino : 4 Steps - Instructables