I downloaded Random Nerd’s Build a Home Automation System for $100 and started testing it out,

A while ago I aquired a Fish Dish (not sure where from), It’s a small PCB that fits on the GPIO header of the Raspberry Pi.

I set up NodeRed and MQTT on the raspbery Pi, and then attached the Fish Dish, to get it working I needed to work out what the pins were:

I plan to use the Fish Dish to make testing easer.