I found a 5V RF relay switch for coaxial cable. I will be using this to get the kids to cooperate when they don't want to stop watching TV. It will be hooked into the digital output. Once triggered, it will interrupt coaxial cable flow. That is one way to get your kids attention.
I am also using digital input to monitor garage door state (open or closed). I use action to text my number the status.
Next idea is to make/buy a leak/flood detector. Also, gas water heater cycle monitor/log.
Also, would like to make a sprinkler controller using iobridge. I have the valves and piping in place. Have a "dumb" controller now. Would like the flexibility that the iobridge provides. Routine use can be set with onboard rules. Rain sensor. Texting or email status.... i have 6 zones. 1 zone, per channel? would mean 4 zones maximum.