Car / rewriting all systems

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hi everybody,

this sencond post on arduino.cc forum's.
i'm looking guidance in project :
i want remove wires of old car (205 - 1988), , replace arduino.
so ... 1 each sectors :
- dashboard (rpm, light, button, ...)
- rear of cars (light, parking sensor ...)
- motor (exaust temp ...)
- ventilation console (ventilation, button warning/rear heater ...)

i need bus communicate securly:
i'm looking communication between each arduino. in car, there lot of noise ...

what best method send data between arduino ?
example: warning -> communicate : dashboard - rears of cars
i want send : rearlightleft:on,rearlightright:on ... (zzzzzz) ... rearlightleft:off,rearlightright:off

question: how sure others arduino got message, , if not, resend ?

regards.
benjamin france.

i presume modified car not used on public roads?

...r


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