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Required.However, this now poses a problem if you want a particular LED to light in a certain position. By wiring the rows and columns together, only 16 pins are

If this were not the case, a single color 8×8 dot matrix unit would need 65 pins, one for each LED and aĬommon anode or cathode connector. The reason the rows and columns are all wired together is to minimize the number of pins required. The reason for this willĪ typical single color 8×8 dot matrix unit will have 16 pins, 8 for each row and 8 for each column. The cathodes of the LEDs would all be wired together in each column. In other words, in aĬommon anode LED dot matrix unit, each row of LEDs would have all of their anodes in that row wired Matrix such that either the anode or cathode of each LED is common in each row. Dot matrix units typically come in either a 5×7 or 8×8 matrix of LEDs.