Wiring help for Rearview Camera
I want to not only be able to have the camera automatically turn on when the reverse lights kick in, but ALSO turn on when I flip a switch in the cabin. So here's a little circuit design I have, and I was wondering whether anyone could help me figure out resistor values, transistor requirements, etc... and just see whether it would work some simpler way.
Since I cant just do the simple 'power the camera from the reverse lights' trick, I have to find a new source of power. I could just tap the power from my distro block that's back there for the amps & carputer. Always having power would mean always having the cam active, so here are the two ways I plan on turning it on and off.
Right now I have 2 switches up in the cabin (see my sig for details, if you're interested). One of which is disposable now. The other interrupts the ACC signal en route to the Opus. I was thinking of splitting that signal immediately upstream of the switch and having both switches be ACC switches. Send the new switch to one of two transistors installed in parallel between the distro block and the camera. The other transistor, of course, comes from the backup lights.
Result, hopefully, would be that the camera would turn on EITHER when the reverse lights come on or when the switch is turned on.
So I probably need a resistor between the reverse lights and the one transistor; and maybe one between the switch and that transistor. How do I know what strength resistors do I need?
Thanks for any help.