Module parameters:

1. A single module can make an 8 * 8 common cathode grid.
   2. Operating voltage module: 5 V.
   3. Module size: 5 cm long X 3.2 cm wide X 1.5 cm high
   4. with four hole screws, aperture 3mm.
   5. Module with input and output interfaces, supports multiple cascade modules

Wiring instructions:

1. the module left as an input port to the output at the right.
   2. the control of a module, just input port to the CPU
   3. multiple modules cascade input CPU, 2 output termination module, one module of the input of the input, the output 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