MAX7219 4-in-1 Display Dot Matrix Module is an integrated serial input/output common-cathode display driver, it connects the microprocessor 7-segment digital LED display with 8 digits, you can also connect a bar graph display or 64 independent LED. Thereon including a B-type BCD encoder chip, multi-channel scanning loop segment word driver, but also a static RAM 8 x 8 for storing each data. Only one external register is used to set the segment current of each LED. This product has 4 Dot Matrix LED’s cascaded to form a single LED Display to allot more area to the user on the display. Connecting the two modules is also very easy. Only connect the output pins of the previous breakout board to the input pins of the new module, thus with such arrangement, you can connect as many DOT LED Modules to the Arduino. Features : Requires only 3 communication wires of MCU Pre-cascaded MAX7219 Dot Matrix LED Module. The overall size of the display is very compact The PCB features M3 holes for mounting. Module with input and output interfaces Support for cascading multiple modules Quite large display

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