I've been tasked by my work to build a simple tally light system, with 5 push buttons and 4 LEDs.
Essentially each pushbutton would kill all leds except the led corresponding to that button, and the off switch will turn all LEDs off. It needs to be spread over 2 rooms. I've done some drawings and would love to hear your thoughts about the design, and if I've missed anything obvious.
My wife accuses me of overengineering all of my projects.
I would do everything wireless. A Wemos D1 Mini with four buttons at the TD location, then an EPS01 with the tally LED at each camera location. Each push of a button would publish on/off messages to all of the tally ESP's. If you have individual monitors for each camera, you could stick another ESP01 there. You could even build a tally box for the floor director.
If your station is anything like the one I worked at, the switcher has a tally plug, probably an RS232 connector, that has dry-contact switch connections so when you take a new camera, you only have to press one button.