I had a serious issue with a new car (campervan) that the dealer can't/won't help with. The main battery voltage dropped to 5.7V overnight with apparently nothing turned on!
I want to measure car battery voltage and log it on a continuous basis - maybe once every 15 minutes - preferably with a time/date stamp. If the voltage drops below a pres-set value I would want to activate an alarm of some sort (sound or light). I have a second battery in the vehicle that I would use to power the arduino and associated circuitry. I'd log for say two weeks before overwriting stored values. (There are periods up to a couple of weeks when I would not use the vehicle.)I had a serious issue with a new car (campervan) that the dealer can't/won't help with. The main battery voltage dropped to 5.7V overnight with apparently nothing turned on! I think it has happened twice. This is almost fatal in a diesel and I cannot afford to be stuck out of mobile phone range with this problem. I want to see if I can work out what causes the problem and when.
None of these *should* cause a current leak but I've had cars with some distinctly unusual wiring designs, including circuits switched through completely unnecessary relays that then consume current for no obvious reason.
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