MAX7219 8x8 Dot Matrix Module - Red LED Matrix Display Module Control DIY Kit

Wiring instructions: 1 The module left as an input port to the output port on the right. 2) the control of a single module, simply input port to the CPU 3 multiple modules cascade input termination CPU, 2 output termination module, a module of the input of the input terminal, the output terminal of the first two modules of the first three modules, and so on.... 51 MCU, for example: VCC ? 5 V GND ? GND DIN ? P22 CS ? P21 CLK ? P20