As the weather is warming up here in Norway — my kids have gotten their bikes out. To make it more fun, both for them and me, I figured I’d build a series of traffic signals that they could play with.
My twin boys are, like their dad, fascinated by switches and flashing lights. I needed an excuse to use the Raspberry Pi Zero in a project, so I built them a WiFi MQTT controlled alarm module. With a couple of switches, some panel indicators, a buzzer, and a blue LED strobe.