Electrical
- Wire your circuit such that the PIC can be easily removed without displacing other wires
- Don't forget bypass caps
- Hot glue can help secure loose components (like the wall wart or speaker)
- Don't hook up the electret microphone incorrectly (it will break, and you will have to order another one from Amazon the day before the competition).
Software
- Program memory is scarce, so use it wisely (increase the compiler optimization level early)
- Use key mapper to test multiple different scenarios without unplugging/reprogramming the PIC
Communications
- Live in a building with a good WiFi connection
- Live alone so no one can complain about beeping noises at 2 AM
- Practice with other teams as early as possible