I need to do GPS and temperature readings at some 5 minutes, preferably in relation to real time (but not mandatory).
I came across various RTC modules, but looks to much complication for this punctual task.
a) Is it any chance to use a sort of external oscillator (a quartz?) to keep track of time, a simple circuit? Precision is not a problem.
b) Is there any practical experience with using Arduino software to keep track of time (I read about mili(), but no idea how practical may be).