Keyestudio ESP32 Manual page 290

ESP32 Starter Kit
3. Test Code
1. Drag the basic blocks and initialize the display. Set the pin CS to IO15 and brightness to 3. Then add a variable
block and select int and name it as "item" with an initial assignment of 0.
2. Add a variable block and name it as "item". Adopt a map function to convert the read sound value range from
0-4095 to 0-7, yet the hypothesis maximum value of sound is 800.
3. Clear the display.
4. Program a condition. If the variable item is greater than -1, the dot matrix displays (x0:0 y0:0 x1:1 y1:0) in color
of red.
5. Repeat step 4, but the judgment is whether item is greater than 0. If so, dots at (x0:1 y0:0 x1:1 y1:1) will light
up. By that analogy, build code blocks referring to the following coordinates.
6. Finally, refresh the display.
Reference Coordinates:
286 Chapter 9. Scratch Tutorial