For Halloween I wanted to build something with my little daughter. Last Christmas I saw that Madrid had set up the Stranger Things letters on a street, lighting up to send a message. I thought it wasn’t a complicated project and it would look great as a decoration at home for Halloween. It was also something simple we could do together, and a microcontroller made it easy to automate and control. All it takes is a XIAO ESP32-S3 and some WS2812B LEDs. It turned out pretty well, so here’s how I did it. Stranger Things Demo video The hardware The brain is a XIAO ESP32-S3 from Seeed Studio. Click to but. [SeeedStudio] The bulbs come from a string light set I bought at…