“I have used the drawing from this instructable, to create a separate traffic light. I made the following changes: Holes for LEDs are smaller, for 5mm LEDs (instead of 10mm LEDs); Added tiny platform, so the traffic light can stand on its own; Changed the shape, so that it can be used for material with thickness of 4mm (instead of 3mm). Note on cost: Since 5mm LEDs are cheaper then 10mm LEDs and 4mm plywood is cheaper then 3mm acrylic, this is a ‘budget’ version of the traffic light. The traffic light can be connected to (and off course programmed with) any microcontroller (such as Arduino UNO). Tip: use an Attiny 85 development board if you wish to keep your entire project very small. With many thanks @ pcvnes for a very good and clear instructable! I really appreciate that even includes instructions (lesmateriaal) in Dutch!”