Here is the basic layout of the situation that I'm into.
I have a remote starter on my car. It's remote can lock and unlock the doors. The way it does it, is through the same wire that outputs a positive or a negative voltage to either lock or unlock the doors.
I want to splice in that wire and send the signal to a latch relay to trigger a device on both lock and unlock signal (kill switch in that case).
That would open the kill switch's circuit when the lock signal is sent and close it back (to a functionnal state) when the unlock button is pushed on the remote.
In order to drive the latch relay, it needs to get a positive inpulse to trigger the coil (or maybe a negative can still work, you let me know).
How can I invert the negative inpulse into a positive one ?
This is either a 5v or 12v voltage, yet to be determined.