Carl Denk wrote:
> Wouldn't be that difficult to get tapped to the turn signal circuit
> itself, then use that to power an opto isolator. This could all be
> hidden.  The circuit should have wires under the instrument panel at the
> steering column. Need to watch for 4 way flashers as a special case.

At least in theory, on some vehicles this information is also available on 
the OBD port (I was just reading the standard that describes the message 
format).

A question for the OP: how do you envision this thing, from the user's POV 
(unless it's a secret, of course)?

Vitaliy 

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist