Adding a wireless interface to a miniature system
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Several miniature wireless modules are commercially available that are compatible in size with our miniature Arduino or MSP430 microcontrollers.  Small Bluetooth, ZigBee, or proprietary modules may be integrated with a miniature sensor to provide wireless connectivity.  The picture on the left shows the Arduino microcontroller module with an Anaren A2500R24A transmitter/receiver module that operates at 2.4 GHz.

The wireless module is connected to the microcontroller using an SPI interface.  Source code for communication between the two modules is available on the Downloads page or at https://github.com/PotomacMesoSystems/Zeptoduino.

10mm x 10mm microcontroller module (left) and Anaren 2.4 GHz wireless transceiver (right).