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The Open Badge project have several version. Please follow these links for more details:

• OpenBadge V3.0. Our latest version. More robust, can measure proximity to other badges, but more complex code

• Communication-protocol. How badges and hubs communiacte

• OpenBadge V2.0. The older version of our badge. A simple, Arduino-compatible, but can't scan and measure proximity to other badges. The code can be find in the openbadge-rfduino respository