Keyestudio ESP32 Manual page 258

ESP32 Starter Kit
9. Drag an "if then" block and fill the blank with a condition: item 9999. Add a statement "set item variable by 0"
in this condition block.
10. Drag a "TM1650 display" from "Digital tube" and define the showing string as "variable item". For the same,
don't forget to delay 0.2s.
Complete Code:
254 Chapter 9. Scratch Tutorial