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Open source software and hardware are about to take a giant, if futile, leap into space, thanks to two “CubeSats” that ascended into the heavens in the HTV-4 “transfer vehicle” that also carried a humaniform robot to the International Space Station (ISS).

The two CubeSats, named because they are cubes ten centimetres on each side, were crowdfunded, weigh less than 1.3kg apiece and are built with Arduino single board computers. The boards run FreeRTOS, a free real time operating system.

Two satellites went aboard HTV-4. ArduSat-1 and ArduSat-X. Both will be launched by the ISS' robot arm. The satellites bear solar panels to power their electronic innards, but lack propulsion. They'll therefore circle Earth for as long as the laws of physics permit but NanoSatisfi, the company behind the satellites, is selling a week of processing time so they should stay aloft that long before being destroyed by the heat of re-entry.

NanoSatisfi partly funded the satellites' construction through a crowdfunding project that offered contributors the chance upload an experiment on the birds. Such code makes use of the satellites' senors, which comprise “a space-rated GPS receiver, a 1.3MP camera, spectrometer, Geiger counter, magnetometer, inertial measurement unit, multiple thermometers, light sensor, electromagnetic wave detector, and various ozone/gas sensors.”

Winners, or the many schools and individuals who purchased time on the satellites, upload code (Arduino's tool is GPL-licensed) from a web interface.

The heart of each CubeSat is the ArduSat Payload Processor Module (ASPPM, depcited below), a single board computer that packs the equivalent of 16 Arduino Uno boards into one. Each processor is dedicated to its own experiment, while a seventeenth processor takes care of the myriad other chores needed to keep the satellites functioning, including making experiments' results available as downloadable .CSV files.

Jonathan Oxer, one of the satellites' designers, says serious science is one aim of the project, its main goal is “ is to inspire hobbyists and school students to learn about space technology, beginning with simple experiments using cheap Arduino boards in their classroom and then seamlessly transitioning to running those same experiments in space on a real satellite.”

That experience, he hopes, will see them take pursue studies in technical fields and over time address skills shortages.

Oxer hopes to release designs for the ASPPM.

“The design of the payload will also be released under the TAPR Open Hardware License, as soon as I have a clear path to do it without falling afoul of the laws restricting international arms trade,” he told The Reg. “That's actually quite a problem because satellite technology is classified as a weapon, no matter what its purpose is.” HTV-4 docks at the ISS early on Saturday, Australian time. The CubeSats will later be cast into space by ISS crew, at a time yet to be determined. ®

The ArduSat Payload Processor Module. Each rectangle is a discrete computer.

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