The matrix LED use driver IC MAX7219/7221. He have a built in clock so they multiplex the LED's.These matrix LED you can connect up to eight 8x8's together (or a combination, such as four 1.2" 8x8's and four 7-segments, etc) on a single I2C bus.
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Trade Leads Directory -> All Trade Leads -> Energy & Environment -> Electricity -> RobotDyn-Matrix LED 8x8 module
