Arduino clone with real-time clock, microSD socket, radio module and USB interface. The layout is designed for easy assembly and maximum compatibility with the Arduino Uno, with additional functionality being compatible with the Arduino Mega2560. The optional LM61 temperature sensor is not fitted, nor is the 5V regulator.
Version 2.1 features a few minor of improvements over version 2; the most significant is the addition of Microchip MCP2200 USB to UART converter.
For more information see blog.stevemarple.co.uk/2013/02/calunium-version-21.html
Eagle PCB design files available under Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) licence, github.com/stevemarple/Calunium