A project for all models of Raspberry Pi. Build your own security system using a Raspberry Pi, RFID reader, a relay, 12V power supply and a magnetic door lock. The project also logs the access using the logzero Python library, this could easily be upgraded to include taking photographs and emailing any unauthorised access attempts to the administrator.
Clone the repository, or run the install script from the terminal
curl https://raw.githubusercontent.com/lesp/LXF230-RFID-Door-Lock/master/install.sh | bash
Enable the SPI interface. Then build this circuit.
The best tool to connect the 12V GND connection is a Wago connector, it creates a common connection. So one GND connection becomes many, it also enables us to safely connect the GND from the 12V PSU to GND connection of the magnetic door lock.
Relays isolate the higher voltage 12V circuit from the low voltage circuit for the Raspberry Pi. This unit cost about £3 from eBay.
The RFID reader is an RFID-RC522, you can find them really cheap on eBay but we used the Monk Make Clever Card Kit as it offers a complete kit, along with a great guide. We reviewed it in LXF229, so take a look.
The magnetic door lock is only £25 and it can resist 280KG of force! Really easy to use, give it power and the magnet comes to life locking the door. Cut the power and the door can be easily opened.