I worked with a team of guys to make a light-emitting alarm clock. We used a Raspberry Pi, an Arduino, a small screen, a string of LEDs, and a round sphere made of laser-cut wood and a plastic shell from a street light. My job was to make the LEDs change color. Lots of hilarious problems ensued: the pulse width modulation software for the Pi didn't work, the Pi got fried, the power supply died, the green LEDs wouldn't turn on, the parts didn't fit into the sphere... and then, at the end, when we were about to present our creation to the other teams, all of the green LEDs turned on, and then the second power supply died. We ended up just talking about the concept, and that was OK because it's a really cool idea and it would've worked if we had had more time. Despite the challenges, it was 100% fun, and I'm really glad I went.