Led Dot Matrix Display Circuit Diagram. If you tried to drive 64 individual leds you would need 64 individual output pins each led connected to a output pin on one side and ground on the other. The figure below shows the arrangement of leds in a typical 7 5 dot matrix display any individual led or a group of leds in the matrix can be activated by switching the required number of rows and columns.
For example a 8 8 matrix of leds shown below would need 64 i o pins one for each led pixel. The desired character or graphics can be displayed by switching on off a desired configuration of led s. Each led is addressed by its row and column number.
If you tried to drive 64 individual leds you would need 64 individual output pins each led connected to a output pin on one side and ground on the other.
Upload the demo program to your arduino nano uno. You can identify the pin out and circuit diagram of it using the following figure. Alphabets and numerals can be displayed by fast scanning of either rows or columns. 1 if r4 is pulled high and c3 is pulled low the led in the fourth row and third column will turn on.
