Module parameters: A single module can drive an 8 * 8 dot matrix common cathode 2 module Operating voltage: 5V 3 Module size: 5 cm long X 3.2 cm wide X height 1.5 cm 4 with four screw holes, diameter 3mm, shop M3 copper stub Module with input and output interface, support for multiple modules are cascaded Wiring instructions: 1 the left side of the module as an input port, an output port on the right. (2) the control of a single module, only need to enter the port on the CPU The multiple modules cascade, the input of a module input termination CPU, the first two modules of the output end of the input of two module output terminal of the first three modules, and so on. .. 51 microcontroller, for example: VCC ? 5V GND ? GND DIN ? P22 CS ? P21 CLK ? P20 Note: 1.VCC and GND is not reversed, it would burn the chip! (2) to use the the P0 port control of the microcontroller 51, must be connected to the pull-up resistor, it is recommended that the resistance of 4.7K--10K Please lattice is first inserted into the round hole seat, then inserted into the round hole Block PCB board welding. Lattice word side facing you, pin the face from left to right order of 123456. PCB board 1 foot square pad! 4 electrolytic capacitors long-legged positive, short legs for the negative; ceramic capacitor has no positive and negative points. packing list(2 sets): - 1 x PCB board - 2 x 5P pin sets - 1 x 24P IC socket - 1 x MAX7219 chip - 1 x 10uf electrolytic capacitor - 1 x 0.1uF ceramic capacitor - 1 x 10kohm resistor - 2 x 8P round hole base - 1 x 3mm 8 x 8 common cathode dot matrix