The potential rate of gas buildup (considering short-term peaks in point 7). 11. Time to alarm of the detection system. 12. Number of alarm levels (e.g., high and low levels). 13. Mixture of gases ...

His alarm is just an Arduino Nano that starts a timer when the car is started. Color-coded LEDs mark the time, and when the light goes red, an annoying beep starts to remind you to get on with the ...