Arduino newbie here. I'd like to know if this project is feasible, and if so, how.
Currently, we have a HDMI cable running from a laptop to a HDMI switcher, this HDMI switchers output then runs to a few screens.
What we want to be able to happen, is someone comes along, plugs in their laptop, and the screens automatically turn on, but we don't want the screens to constantly be on waiting for a HDMI input.
We've already worked out how to turn on and control the switcher using RS232 straight from the Arduino, so controlling the switcher itself is not a problem.
My idea was to somehow hook up the Arduino to the HDMI cable which leads from the laptop to the switcher, and if a HDMI signal is detected, then turn on the switcher. Turning on the switcher itself isn't a problem from the Arduino, but we were wondering if it's possible to detect if a HDMI signal is being sent down a cable in order to perform the appropriate response on the Arduino.
If this is possible, and suggestions on parts/methods is appreciated. Thanks! :)