Keyestudio ESP32 Manual page 210

ESP32 Starter Kit
3. Stop playing module, we only need to set the corresponding pin to stop the music
9.2.12 Project 9Digital Tube Display
1. Description
This 4-Digit tube display is a device used to display counting or time, which is able to display numbers from 0 ~ 9 and
simple letters. It consists of four digital tubes, each of which has seven light-emitting diodes (LED).
Moreover, multiple functions can be realized by connecting their pins to the Arduino development board, such as
timekeeping and some game storing.
206 Chapter 9. Scratch Tutorial