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Now I design the fire alarm panel i use ATMEGA16 for the controler , i wonder how i can detect loop cable exspecialy for cable that i connect to contact relay (i use relay to activated solenoid) because some time that cable got voltage 24vdc..., for input sensor i use adc input ATMEGA16 to...
@nandu : there is good solution to fit diode across the relay coil in internal system but for external relay it doesn't work well , i will sell this system out and i can't makesure that the buyer can fit dioda in every relay in their car.
@dick_freebird: i will re design the PCB (better ground...
I have alredy build a microkrontroler system in car, with attiny2313, but i have some problem:
The system work unconsistenly if we running another equipment that used relay, we used 1 source (battery). example if we turn the head lamp on, horn in car, the system trigered by them.
I suspect...
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