When I was offered a $300 1998 A8 Quattro parts car (for my 1997) I leapt at the chance. By the time I got it home, though, I thought better of my plan to swap the electrical harness from that car to my car, and decided that I would swap the transmission from the old car into the "parts" car because it was in such better shape. But this presented a problem — how do I pull the engine and transmission out of one car, and put it into the next, given my lack of a perfectly flat and level place to work? The answer as I see it is to build an A-Frame or a gantry.
Long, long ago, when I first heard of Philips Ambilight, I thought it was one of the coolest silly things I'd ever heard of. Today, much later, I finally have gotten around to rolling my own Ambilight clone using an Arduino Nano and WS2812B strips. I did not have to write any code, because other people have already done it for me. Figuring out which people had done what properly took me the better part of a day, so I will now share my knowledge with you here. This should be a cross-platform (Win/Lin/Mac) solution, but I have only tested on Windows.
Faced with the desire for a GPS-navigating fixed wing drone, I came upon PatrikE's fork of MultiWii 2.4. I forked it some more, to produce a version with SD card logging. The result is multiwii-2.4-fixedwing on github.
Some little while ago, I picked up an e-Flite Apprentice, a fairly common foam "trainer" model airplane which is normally sold "ready to fly" with everything but the battery and charger. It was part of a lot of stuff that I picked up for ten dollars, and came without the radio. First I repaired it and mounted a HobbyKing HK-T6A v2 radio, but I quickly decided that it should be more than just a plane.
Well, I finally built me a drone so's I could fit in with all the cool kids. What follows is a short description of my experience with helpful links for someone else who would like to build a substantially similar quad. I built basically the cheapest quadcopter you could use for anything more than just crashing into stuff, a SK450 whose parts were primarily sourced from eBay — and usually with the very cheapest parts.