As a happy user of the Automation Hat on my Pi, I find myself short on digital input pins (and already occupied the 3 ADC inputs for just on/off purposes at the moment, so all 6 inputs used).
I have a need for a few more digital inputs that can handle 12v so I am wondering what is the best/easiest way to use the free GPIO pins as additional inputs (Maybe an idea for a new SHIM :) ) ?
Or maybe putting an IO Plus board between the Pi and Automation Hat could be a way to go? It actually uses I2C so not the unused pins :) Looking at the used I2C addresses, it could work?
Biggest ‘issue’ is probably what needs to be done to make the standard Pi GPIO pins, which work at max 3.3v, also 12/24v tolerant? Is there something out there that can be used? Are these Opto-isolator boards an option?
Finally, is there a good way the get access to the unused pins like putting some kind of break-out board/connector in between the Pi and the HAT?