The question is about controlling the projector screen using the projector remote control.
Using arduino, I read the remote control codes that interest me and wrote a control program.
I do not want to create a new circut to control the screen but I would like to use the one that is factory in this screen. It is a system based on wireless communication. The factory circut also has the ability to control microswitches on the controller housing and I would like to plug in there with arduino.
The question is, can I somehow simulate the action of such a button in arduino? so to pass the signal between two pins?
Each button has a voltage of 5V, 5.2V, 4.7V, the second button contact leads to a common point for the three buttons. It looks like depending of the voltage the appropriate relay was activated.
The factory relays are on 12V, so I can't control them directly with arduino. The easiest way would be to simply push the button, but how can I do it without adding a relay instead of a button?
Maybe plug transistors before relays, and arduino will control transistor which open and let flow 12v to relay? What is the easiest way?