Two Relay Board Activated By Low Signal Optocouplers

There we go, I have a small PCB board set up with two 12V Mini 10 Amp Songo Relays that are each activated separately by two Optocouplers. I only need one side of this board for right now to complete the wiring scenario I mentioned in my last post for turning on the Lower Console switch lights as part of the Knight Rider dash start up sequence.
The Red and Black wires you see coming in from the left side end of the board will ultimately be spliced into the wires that connect from the Voice Box to the last set of lights in the Top Countdown indicators, this way when the Knight Rider V.B. activates those lights a signal will be sent to the Optocoupler, activating my Relay and closing the power connection to the Lower Console switch lights. I did a little tweaking to my diagram so here it is again just so you can see my minor tweaks ;)

Lower Console Switch Lights As Part Of Dash Start Up Sequence

OK, here is a solution to something that has been kind of on my mind for a little while now....

So the Lower Console's button and switch lights are on all the time currently even if the ignition is off.... not good I know, bad, bad, bad... as these are not LED lights in this buttons and switches and given enough time would drain the battery for sure. So last night I had a thought pop into my head as I learn more and more about what many of the electronics components are capable of... my idea was this:

"Why not run a small 22 AWG wire from the last top countdown indicator on the top of the dash and run that to the base of a Transistor to activate a Relay that would turn on my Lower Console Switch and buttons lights?

That way when the dash did it's startup sequence, upon the lighting of the very last indicator a signal could be sent to activate my Lower Console lights."

Very simple I thought, so I got into a great conversation with Andrea lannaccone on Face Book this morning and we hashed out this wiring scheme. NOT using a Transistor as I had originally imagined but instead using an Optocoupler. Hey whatever works and is simple I always say ;)

You can see in the middle section of our diagram how we have introduced the wiring of the last countdown indicator LED to the Optocoupler which in turn triggers the SPST Relay which sends power to the Lower Console's switch lights making it an interactive part of the Dash start up sequence.... should be pretty cool when wired up and tested out ;)