it’s an LED matrix that is driven straight from an ESP8266 board. [Ray] put it together as a quick project for his students to teach the basics of LED programming. It’s built using a WS2812 ...

Take for example this ESP8266 clock by [ZaNgAbY] that’s housed ... Inside the jar there’s six 8×8 MAX7219 LED matrix modules tacked together to create one long strip, with a NodeMCU board ...