The Next Hope recently finished with attendees wearing an MSP430 based hackable badge. Previous badges were based of Microchop PICs, but shifted to the more power efficient MSP430 line. The badges are built from a MSP430F2618 controller coupled with a NRF24L01+ Nordic 2.4 GHz radio. The badges are active RFID tags which transmit the position of each attendee a few times a second based on OpenBeacon.
Dr.[D]obb is a ham radio enthusiast[call – WD5GNR]. He managed to program his Chronos to “beep” the current time in Morse Code. All he had to do is write a little code in the idle loop of ezchronos.c. He used OpenChronos as his firmware and gcc for compilation. Video after the jump.