This is an APRS tracker for the Arduino/Atmega328p platform. It gathers position data from a GPS and broadcasts via radio using standard APRS position messages. It was designed primarily to track high altitude balloons, so it has other handy features like reading temperature sensors and a cut-down mechanism.
Trackuino is intended to be used by licensed radio amateurs. By operating on the standard APRS frequency the signal might be picked up by an Internet gateway and reported by aprs.fi, so anyone with an Internet connection can track the flight live and even help with the chase!
The project comprises both the firmware and the schematics/PCB to build your own stand-alone tracker. The tracker board includes the microcontroller, the GPS module and the radio transmitter. You can also run the firmware on an Arduino and wire up the GPS and radio modules externally.
This is how a finished board looks like:
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