boarder2k7
Member
I'm using a Teensy 3.0 board for an automotive application right now, and I would like to do two things with it that I'm not sure the best way to work out. First thing I'd like to do is be able to read various signals from the car, these are just 12 V (or I suppose more accurately up to 14.7 volt) lines that run high when on, for error lights and such. The other thing I'm trying to do is be able to read battery voltage to initiate a low voltage shutdown procedure.
One way to do this would be with voltage dividers, to pull the pin high (or supply an analog voltage) without going over the allowable spec on the board. While I'm confident that this should work, it doesn't seem very safe as it is totally un-isolated in the event of a high voltage event (like the VR on the alternator dying) so I was wondering if you could think of something else.
Thanks
One way to do this would be with voltage dividers, to pull the pin high (or supply an analog voltage) without going over the allowable spec on the board. While I'm confident that this should work, it doesn't seem very safe as it is totally un-isolated in the event of a high voltage event (like the VR on the alternator dying) so I was wondering if you could think of something else.
Thanks