Hi all,

Good day. I am not good in my analogue electronics and
currently i am trying to build a security cum alarm
system for vehicles. I have read that in automotive
electronics, it is very important for electronic
circuitry to be protected from the EMI and transient
voltage and even overvoltage protection ( during
starting, when the voltage can surge to 15 V from the
supplied existing 12V battery, or when high voltage is
purposely pump to these points by thief to burn the uC
).

I would like to pool the experiences of everyone
favourite type of interface circuitry when designing
system that interface between a controller and the
input from outside world of sensors which could
interprets correctly the input signal ( HI, LO, HiZ )
and at the same time offers necessary protection.

Thanks and have a nice day.

Rgds,
Pang

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