Blackmagic VideoHub control with PESA RCP, Arduino and PowerShell

I have found the PESA RCP-TP or XY control panels relatively easy to convert for controlling Blackmagic ATEM switches, VideoHub routers and anything else I can automate with PowerShell. These PESA units us a Motorola 68HC11 processor which can be swapped for an Arduino Uno, which has just enough pins to support all the hardware…