Using keychain as power switch

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i'm new topic of arduino, apologize in advance if beginner question. intend quite simple: want add kind of sensor keys, switch on power sockets in house when keys present @ specific location. when keys not present @ location, power sockets turned off.

i've found quite number of tutorials on how control power switch, that's not problem. struggling switch. thought rfid keychain make sense, far understand, control switch swiping keychain on sensor (right?). not aim though. should switched on based on presence, , switched off based on absence of keychain.

i thought magnetic switch, since keys made out of metal, isn't realistic solution either. thought on kind of method use detect presence of keys?

there rfid detectors want, , allow range of dozen cm or more (so don't need swipe anything). lot of hotels use them -- put rfid room key in wall holder , room lights turn on.


Arduino Forum > Using Arduino > Sensors > Using keychain as power switch


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