HackSpace issue 4 is published today, and it includes my article explaining how to build an NFC-powered door lock using a Raspberry Pi + RFID reader, a relay switch and an electronic striker plate.
The magazine is available in all good newsagents or you can download the free PDF from the HackSpace website at https://hackspace.raspberrypi.org/issues/4
You can also now view this tutorial on the Switched on Network website, here: https://www.switchedonnetwork.com/2018/01/17/how-to-build-an-nfc-powered-door-lock-with-a-raspberry-pi/
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