Raspberry Pi stopwatch on power on -


i'm trying figure out how build raspberry pie start stopwatch power turned on, stop when turned off , keep counting when turning on again.

any ideas? :)

the final product stopwatch count 24 hours, 150 hours, 300 hours , 600 hours , show different warning each goal. warnings can reset individually.

it's engine need different service checks depending on how long has been running.

kindly, rasmus


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