* C
- Use static global vars + getter or extern in tests?
- Use const for "final" function parameters
- Check other use of const (return value?)
- Flexarray? http://en.wikipedia.org/wiki/Sizeof
- License? (github)

* AVR
- What happens if USART data is sent to the AVR too fast (GtkTerm Send Raw File)

* Functionality
- Add rules and alerts according to FIRE RULEZ!
  
* Circuit
- Look at oxygen sensor voltage with voltmeter/oscilloscope - is the voltage
  really so unstable?
- Put button and beeper pins in pins.h (watch out with OCR1A)