We've seen any number of re-purposed hacked Kindles over the years, including as a weather station, fridge magnet, and wireless monitor, but all of those projects pale in comparison to one hack i just found.
An ambitious Kobo owner has hacked his Kobo Mini and turned it into a GPS-equipped flight computer. And unlike the Kindle bike computer or the Nook flight computer, this Kobo Mini is a self-contained unit with the GPS receiver modded into the case.
Back in 2014 a hacker and glider pilot going by the name of Tweepy decided they wanted to find a way to run the XCSoar flight app on hardware with the following requirements:
- sunlight readable (E-ink)
- usable with gloves (anything but capacitive)
- long battery life
- running android/linux
- GPS and/or bluetooth
- dirt cheap
They hit upon the idea of modding a Kobo Mini so that it could tie into a GPS receiver and run the XCSoar app, but instead of using the Kobo Mini as simply the display (like we've seen with past projects) Tweepy instead decided to integrate the GPS receiver into the ereader, mod the shell to fit the receiver (and a larger battery) and thus have the entire system in one neat case.
Tweepy pulled this off by first wiring the GPS receiver into the Kobo Mini's internal serial port and then replacing the stock 1Ah battery with a larger 3.8Ah battery.
There isn't nearly enough room for either component in the Kobo Mini, but Tweepy fixed that problem by 3d-printing a "spacer" part for the shell which made the Kobo Mini slightly thicker and added a dongle for the GPS receiver.
What was really cool about this project is that Tweepy was able to reassemble the Kobo mini by reattaching the rear shell. If not for the extension for the GPS receiver, you would hardly know that this ereader had been modded.
They also came up with a second design which mounted the GPS Receiver on the front of the Kobo Mini rather than the upper edge:
With new maps, a few software updates, and of course the awesome XCSoar app, Tweepy had a great flight computer for under 100 euros.
And if you can get your hands on a Kobo mini, so can you. While researching this post I found all sorts of 3d-printed parts for Kobo ereader. Most were designed to fit the Kobo Mini and add space inside the case for things like sensors, a bigger battery, etc.
So it seems that this 5" ereader was popular with hardware hackers, and not just a subset of ebook readers. It's a shame Kobo never followed up on this; they might have missed out on a potential market.