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PICList Thread
'AW: [PIC] pulse counter help?'
2005\11\08@063952 by regen / Mailinglists

> I'd like to limit this to just the chip, a
> voltage regulator, a relay, and a diode to protect the pic
> from the relay (advice on the diode would be welcome too).

Beside all the programming stuff, please take a closer look to the
voltage regulator.
12V in automotive are extremly noisy and have spikes up to 60 volt.
Just a LDO without protection will be killed inbetween minutes.
At least a serial resistor and a Z-diode (~20V) in front of the LDO
should give you a minimum of pretection.
Or go for an LDO which is qualified for automotive usage.

Best Jens

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