I am trying to figure out a cct which uses a 555 timer to send a pulse to imitate pressing of a button when I turn the ignition on. I want the pulse to be about one second long. The thing is, when I start the car the trigger will always be at a steady state, not a pulsed input.
I have tried this, but the output just stays low, if the trigger is steady state low.
I was thinking I could use the momentary position of the ignition switch which turns the motor and it would be like an trigger pulse, but I wish to use he same circuit more than once , and when the car is already running.
Anyone any ideas on this?
Thanks.