This a simple stand for the Kitronik STOP:bit traffic light for BBC micro:bit make it more stable and include a battery module for standalone operation. We use bluetooth to control the traffic light.

Traffic light: https://kitronik.co.uk/products/5642-stopbit-traffic-light-for-bbc-microbit also sold here: https://botland.de/mikro-bit-erweiterungen/16133-stop-bit-fernlicht-fur-bbc-mikro-bit-kitronik-5642-5904422383923.html

Battery module: https://www.reichelt.de/batteriehalter-fuer-2-mignon-aa-geschlossen-halter-2xaa-p44629.html?&nbc=1

Code for bluetooth operation (by Lukas Zöllner): https://github.com/lukaszoell/bluetooth-ampel

Code for bluetooth web remote (Chrome): https://GitHub.com/azplanlos/ampel-steuerung Use web remote directly: https://azplanlos.github.io/ampel-steuerung