I'm building a home alarm system with Raspberry Pi 3 B+ and the PiFace Digital 2 board. I will have used all 8 inputs, and maybe 4 outputs.
Now, my question is, If I would like to connect a 16x2 LED display sitting in hallway, (RPi will be in the technical room) is there a possibility to connect it? Because all the GPIO pins are already used by PiFace and I've searched, but couldn't find an extension board, which would allow me to use PiFace Digital + GPIO pins.
do you have any idea, how to solve this?