This project aims to give you a modern and complete IoT door alarm to deploy on your esp32. It has been built with esp32-arduino framework. It is based on the Magnetic Hall effect, which is why a ...

The iron core increases the coil’s magnetic field strength ... the electromagnet switches off when a fire alarm is sounded and the doors close.

The reed relay is normally open, but when a magnet is getting close to it, the relay contacts will close. Here we will use this feature to create door (or window) open/close detector. This can be ...