Keyestudio ESP32 - 5. Code Explanation

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ESP32 Starter Kit

5. Code Explanation

1. Set the CS pin. In the code, DIN is ﬁxed to io23 and SLK to io18, while CS pin is optional. For convient wiring,

we select io15.

2. Draw pixels. This code block will light up or turn oﬀ pixels on the dot matrix by axis x and y, with red for on

and black for oﬀ.

3. Draw line. Locate the line by two group of coordinate points, also with red for on and black for oﬀ.

4. Show characters. We have add character libraries so you only need to type a letter to display it on the dot matrix.

Besides, it must be used cooperatively with a “rotation 180°” block.

5. Show numbers. Similarly, you only need to type a number to display it on the dot matrix, and it also must be

used cooperatively with a “rotation 180°” block.

6. Show scrolling character strings. Collocating a “rotation 180°” block, the speciﬁed scrolling strings will be

displayed after setting its speed.

7. Display image. For convenience, we have already integrated some emotion icons which can be selected directly.

216 Chapter 9. Scratch Tutorial