This will be basic electronics to most people on here,but it's something that always confuses me.
I've got a timer that's triggered by the central locking lock pulse on my car.The central locking is just a 12 volt motor that spins one way to lock the car and the other way to unlock it.Both the wires rest at ground while one goes to +12 volts to lock and the other one goes +12 volts to unlock.My timer is triggered ok by the 12 volt lock pulse (about 1 second),but when I unlock there's a corresponding 1 second pulse on the lock wire of about 0.4-0.5 volts,which is enough to trigger the timer again.
Can I use simple pull up or pull down resistors to prevent it from triggering when I unlock,or is there more to it that that? Yes I know I could do it easily enough with a relay,but I really want to keep this fully solid state.
I've got a timer that's triggered by the central locking lock pulse on my car.The central locking is just a 12 volt motor that spins one way to lock the car and the other way to unlock it.Both the wires rest at ground while one goes to +12 volts to lock and the other one goes +12 volts to unlock.My timer is triggered ok by the 12 volt lock pulse (about 1 second),but when I unlock there's a corresponding 1 second pulse on the lock wire of about 0.4-0.5 volts,which is enough to trigger the timer again.
Can I use simple pull up or pull down resistors to prevent it from triggering when I unlock,or is there more to it that that? Yes I know I could do it easily enough with a relay,but I really want to keep this fully solid state.
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