RFIDuino – Using an Arduino & RFID Reader to make a puzzle GeoCache

I enjoy both Geocaching and electronics and have made a couple of electronic puzzle caches using an Arduino. My latest creation (with the help of a fellow cacher for the code) is using an Arduino and RFID reader to make a puzzle geocache we call RFIDuino. The GeoCacher takes RFIDuino and has to find 3 …

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