I’ve been wanting to build a flashing traffic light that mimics a real intersection, so I designed this one.

Initially, I envisioned two lights—a main light and a secondary light—but I’m rather lazy, so I only implemented the main light for now.

If anyone is interested, I could create an interactive intersection light.

I originally planned to use monochrome LEDs, but because I’m lazy, I ended up using WS2812RGB LED chips instead; simply wiring them in series achieves the desired effect.

This project requires six 5050-packaged WS2812 LEDs (other package types will work as well), 0.2-mm-diameter solid-core enameled wire, an 8-pin driver chip, a small soft-pack lithium battery, and a lithium-battery charging module.