Traffic lights! Kids love them, hackers love them, and they’re useful in industrial contexts to see if the giant machine is currently working or having a bad day. While the real deal are unwieldy and hard to come by, there’s nothing stopping you tackling a fun cardboard build at home.
In this case, the light is courtesy of WS2812b LED strips. They’re a great choice, as they interface easily with most microcontrollers thanks to readily available libraries. An ESP8266 runs the show here, serving up a basic web interface over WiFi. This allows the color of the various LEDs to be controlled remotely. It also allows the lights to be switched on and off to direct whatever traffic you may be controlling. The whole project is all wrapped up in a simple cardboard enclosure, mimicking the municipal street furniture which so resolutely commands our movements.
The cardboard traffic light is a project that shows just what can be done with some off-the-shelf parts and some good old-fashioned kindergarten-style arts and crafts. If you find yourself similarly admiring these devices, check out our primer on the North American traffic signal. Video after the break.