I am building a setup to make more inputs on a composite monitor (in fact it's a VGA monitor with a composite-to-VGA converter on it but the overlay needs to be composite) and everything will be controlled via a microcontroller.
I want to be able to show a menu that will tell me what source is selected. I made everything and it does work, but when I open the menu the whole screen does blank and only my menu works (witch is normal because it currently have it's own composite signal and when I open it up the relay of the input is turned off to turn on the one of the menu).
Can anybody guides me in the process?
The cheaper working solution will be the best one.