Pance Cavkovski has written a nice tutorial on programming a touchscreen interface, using the PiTFT screen, using JavaFX 8. His project involves an NFC plug-in board which scans your access card and then prompts you to enter a code, thus triggering a (virtual) door to open. Read all about it here.
Alex Bain has written a brief tutorial that will help you to set-up an automatically-running script which will detect if your wifi connection is dead and then, if so, restart the service (thus attempting to re-connect). Read the tutorial here.
Unfortunately, I don’t have enough time at the moment to fully understand this one! I’ll let Liz Upton from the Raspberry Pi Foundation explain:
Adam Vaughan is controlling an engine with an adaptive Extreme Learning Machine algorithm on his Pi, which predicts homogeneous charge compression ignition in real time.
It’s incredibly difficult to do, apparently, but thanks to the Pi and a heavy dose of programming, he’s been able to do it. Read more over at the Foundation’s blog.
Clayton Lambert has written a nice Python script which takes a picture with the camera module and scans it for changed pixels, indicating motion. It uses the picamera library and I think it’s particularly good because you can see how it looks at each pixel of the image and counts the changes. He explains it in the video above and the code is available here.
