FireFly Badge

FireFly Badge is a light-weight, small and rechargeable mobile-senor networking platform. The name comes from the fact that these devices can be embedded into ID cards, b adges or made into smaller "cards that can be inserted into mobile phones. The figure below shows the hardware platform next to its enclosure and a U.S. quarter dollar coin to facilitate size comparison.

The block diagram of the hardware is shown below. It consists of an Atmega1281 8-bit processor running at 7.37MHz and a Chipcon CC2420 802.15.4 radio. It has a USB interface for charging and connecting to a PC or a laptop. The device can also be charged using a DC wall adapter. It also has an ADXL330 accelerometer that can detect motion. A 3.7V Li-Ion battery powers the device.