My Arduino question is below, but here is the background of the problem I'm trying to solve: I bought a board (not an Arduino) for my model railroad that senses when a train is coming and makes grade crossing signals activate. One functionality of this board is it has three output pins to send a signal to a servo to rotate 90 degrees so the crossing gate arm goes down. (Of course the three pins are the power and signal wire.) It only has one place to plug the three servo wires into. With one servo it works perfectly. However, I need two servos to operate the gates on each side of the tracks. I tried simply splitting the wires to send its signal to two servos, but when I do that the servos get glitchy, sometimes activating and deactivating at the wrong times and the board itself gets glitchy like its getting some interference back from the servos. Would anyone know how to prevent that?
I am wondering if an Arduino could solve my problem. My thought is to plug the output control wire into the Arduino instead of a servo. Then program the Ardunio to listen for the signal, and have the Arduino tell each of the servos to rotate 90 degrees. But I'm not sure how to have the Arduino listen to the signal. What would the code look like to read that pin and sense that a servo activation signal had been sent?
Thanks for any help!
Victor