MAX7219 Microcontroller 4 in 1 Display Dot Matrix Module ForSpecifications A single module can drive a 8x8 dot matrix common cathodeWorking voltage 5VModule size 12 8 x 3 2 x 1 3 cm L W H With 64 fixing screw holes hole diameter 3mmModule with input and output interfaces support for cascading multiple modulesWiring 1 The left side of the module is the input port and the right is the output port 2 Control of a single module the input port only need to receive CPU 3 The more a module cascade and input end of the first module is connected with the CPU and input end of the input end of the output end is connected to the second module output terminal of the second module connected with the three modules and so on For example 51 SCMVCC5VGNDGNDDINP2 2CS P2 1CLKP2 0Package included 1 x MAX7219 Dot Matrix Module1 x 5pin Dupont Cable