I’ve had this particular project in mind for quite some time, and was excited to dive into it with simple raw materials: my Raspberry Pi, a touchscreen, and a mechanical relay board. If you ...

And thanks to their general-purpose input/output (GPIO) pins, you can easily connect multiple sensors to the board and build ... four components: Raspberry Pi, lightbulb, relay, and switch.

But with the addition of a Raspberry Pi, he’s got it back ... Note that he was able to pull 5 VDC from the relay board and run it to the Pi over the ribbon cable, so he didn’t need to bother ...