MAX7219 DIY Kits1 single module can drive the an 8 * 8 dot matrix common cathode2 the module Operating voltage: 5 vThe Module 3 dimensions: length 3.2 cm X 3.2 cm wide X 1.3 cm high4 holes with four screws, the diameter of 3 mmFive modules with input and output interfaces, support for cascading multiple modulesWiring instructions:1 on the left block to an input port, the an output port on the right.2 the When the control of a single module, simple enter the port received a CPUThe When wining 3 modules cascaded output input termination CPU, the input output termination module of the first two modules of the first one, the first two modules of the termination input terminal of the three modules, and so.The To 51 single example:VCC 5 vGND GNDDIN P2.2CS P2.1

CLK P2.0