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Thread: Interfacing PIC to automotive electrics?
face BY : Gennette, Bruce email (remove spam text)

Hi all,

Probably been explained before, but how do I interface a 5V PIC to the
signals coming from 12V car (and 24V truck) devices like temperature and oil
pressure sensor/senders?

I suspect that cars can use CMOS comparitors set against a trim pot (with
zeners to divert any spikes), but how about truck (or boat) engines using

Could I use voltage dividers to bring the signals down to the 0-5V range and
directly connect to a PIC or TTL gates?

For this first project I'm just looking at the alarm state ( !Ok ), but
later I may want to log all parameters so that a progressive failure can be
spotted (eg cooling water temp hotter each day indicates a growing blockage
in the system or excessively worn pump).

If there is an existing FAQ could someone point me to it please?

Thanxs in advance,


See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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