I recently wired a sensor in my car based on this design:
The sensor was wired into the fuse box to a circuit that was on with the =
key, on while the car was starting, and on while running, etc. However, =
I have this ingenious idea on sensing whether or not the engine was =
actually running, not whether or not the key is on while someone is =
listening to the radio, or whatever...
Maybe someone can help me with a circuit design (hopefully 2-3 parts), =
to sense the voltage. If the voltage is 12v or so, then the alternator =
is not spinning... if the voltage is 13v+, then the engine must be =
running. So, I would like to have a circuit that trips at about 13v, and =
turns on a relay. Currently, I have a relay directly wired to the =
I'm immagining that 2-3 resistors and a general porpose NPN transistor =
could accomplish what I want... however I'm thinking that using a zener =
diode may simplify the circuit... but I can't think of how I should wire =
Anyone have any other ideas?
--- In misterhouse@..., "Steve Switzer" <steve@...>
>However, I have this ingenious idea on sensing whether or not the
engine was actually running,
My car just uses the oil pressure switch........
You could also use the tacho output from the alternator.
Sorry it doesn't answer your actual question.