If the row gets positive voltage and the column gets negative then only a particular LED will glow.įor example, If you want to glow an LED connected between R2 and C1, we have to apply 00000010 logic on row R1110 on column C1. To Turn on a specific do, we need to apply a positive voltage to the respective row of that dot and negative or ground to the respective column of that dot. This method of controlling a large number of LEDs with few pins is known as multiplexing. Otherwise, we will need 64 pins to control an 8×8 LED matrix. ![]() By doing this, the required number of I/O pins has been reduced to 16. The reason for connecting all rows and columns together is to save the required number of pins to control each LED dot. Each LED is referred to as a dot.įor making an 8×8 dot matrix all the anodes terminals are connected together in rows R1 to R8, similarly, the cathodes are connected together in columns C1 to C8. Each LED is addressed by its row and column number. ![]() ![]() The typical 8×8 LED matrix is shown below which comprises of 64 LEDs, 8 for each row and column. LED dot matrices are available in various dimensions (7×5,8×8, 7×15, etc). MAX7219 8-Digit LED Display Driver LED Dot Matrix
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