Hackaday (unofficial) July 13, 2021 9:00am NFC Who’s at the Door #hardware #securityhacks #accesscontrol #esp32 #github #nfc #opensource #pn532 #security #hackaday posted by pod_feeder_v2 NFC Who’s At The Door [RevK] wanted to learn about NFC readers, and we agree that the best way to do so is to dive in and build one yourself. There are readers available from multiple sources, but [RevK] found them eith…