Open Altimeter - the awesome tool for you all!

Jony Epsilon develops an amazing, open, Arduino-based product he calls the OpenAltimeter. It's a device that accurately measures, logs and plots readings from a built-in, high-precision altimeter. It is capable of integration with other on-board servo-signal based systems and a myriad of other functions, limited nearly only with your imagination, creativity and flying needs!

Please visit Jony's website at www.openaltimeter.org
or check out the forum thread to see how robust and versatile this product is: openaltimeter on RCGroups

Here's a demo video made by the man himself: