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MicroPeak is a rocket altimeter that is both precise and tiny, designed to be the ideal altimeter for model rocket contests.
Micropeak is a barometric logging altimeter for precision model rocketry altitude measurements.
Data download is available using the MicroPeak USB adapter.
The MicroPeak manual is available in html and pdf formats.
The MicroPeak application runs on Linux, Mac OS X and Windows. It communicates with the MicroPeak USB adapter to download and analyze flight data. It's written in Java and offers the same functionality and interface on all three platforms. It uses the FTDI USB Serial drivers to communicate with the hardware. If you're running Mac OS X or Windows, a compatible version of those drivers is included with the software. You can also install a different from from the FTDI Driver page.
MicroPeak is part of the larger AltOS suite of software, which also includes a dedicated TeleGPS application.