Keyestudio Smart Little Turtle Robot V3 Manual page 142

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8×8 dot matrix contains 64pcs LEDs.
The inner structure of 8×8 dot matrix is shown below.
Every LED is installed on the cross point of row line and column line. When
the voltage on some line increases, and the voltage on some column line is
reduced, the LED on the cross point will light up. 8×8 dot matrix has 16
pins. Put the silk-screened side down and the anticlockwise numbers are
1,8, 9 and 16.
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