I practice physical computing to reinforce my understanding of computer logic. This project is using a microbit, a relay solenoid, and a valve solenoid. Theres many possibilities and use cases for the project that can be very useful but I myself am generally just interested in getting all of my hardware to talk to each other properly. In this case, Im triggering my shower to start when the front door knob is turned. The video of my project in action is below, followed by the microbit code.

I know, I know – My code is missing documentation. Ill explain how the program works sometime but its not a priority for me right now….