Keyestudio ARDUINO maker learning kit, Manual

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117
The display principle of the 8*8 dot-matrix:
The 8*8 dot-matrix is made up of sixty-four LEDs, and each LED is placed at the cross point of a
row and a column. When the electrical level of a certain row is 1 and the electrical level of a
certain column is 0, the corresponding LED will light up. If you want to light the LED on the first
dot, you should set pin 9 to high level and pin 13 to low level. If you want to light LEDs on the
first row, you should set pin 9 to high level and pins 13, 3, 4, 10, 6, 11, 15 and 16 to low level. If
you want to light the LEDs on the first column, set pin 13 to low level and pins 9, 14, 8, 12, 1, 7, 2
and 5 to high level.
The internal view of a dot-matrix is shown as follows:
The principle of 74HC595 has been previously illustrated. One chip is used to control the rows of
the dot-matrix while the other chip is used to control the columns.
Connect circuit as shown in the following diagram:
Connection for R3: