原创 DIY LED ARRAY

To turn on the top left LED in this schematic, we would make row 0 be LOW, column 0 be HIGH, and simply drive no current onto the other row and column wires. For its neighbor one spot to the right, we would make row 0 be HIGH, column 0 be LOW, and not drive the others. The same pattern applies for all of the 5 row and 12 column wires, so that ultimately we can individually control every LED in the array. Row-column addressing, like shown here, is an extremely common way of reducing "pin count" of systems, which allows for simpler wiring and cheaper parts. For example, numeric keypads, like those on a telephone, have a row-column matrix of wires, so that an individual wire per button is not needed