I want to make a very simple midi over usb controller with just 4 buttons with Arduino Uno. I will use this controller to control QLab (an audio cue software for mac osx) for a dance show. Untill this everything is ok.
Now, I am using 2 macbook pro. One is the show laptop and the other one is the backup laptop. What I want is being able to press a buton of my controller to fire QLab on the two laptops. For this I'm thinking to use two Uno boards each one connected to its laptop via usb.
The questions are: Is it possible to connect the same push button to the pins of two Uno boards and Is it a correct design? Is I2C protocol an alternative for what I want to do? (Not sure if I can use the usb on master and slave). Is there a better alternative?
Thanks in advance for your help. Stéphane.