Keyestudio ESP32 Manual page 274

ESP32 Starter Kit
3. Wiring Diagram
4. Test Code
The analog value of the potentiometer can be read:
1. Drag the two basic blocks. Put the baud rate setting block between them and set to 9600.
2. Add a "serial print" block in "forever" loop, and select "warp" as the print mode.
3. Drag a "read the value" from "pot" to the serial print, and set the pin to IO33.
270 Chapter 9. Scratch Tutorial