Keyestudio Smart Little Turtle Robot V3 Manual page 144

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For instance, to light up the LED on row 1 and column 1, increase the
voltage of pin 9 and reduce the voltage of pin 13.
(4) HT16K33 8X8 Dot Matrix
The HT16K33 is a memory mapping and multi-purpose LED controller
driver. The max. Display segment numbers in the device is 128 patterns (16
segments and 8 commons) with a 13*3 (MAX.) matrix key scan circuit. The
software configuration features of the HT16K33 makes it suitable for
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