Wiring instructions: 1. On the left block to an input port, an output port on the right. 2. When the control of a single module, simply enter the port received a CPU 3. When more than 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 on. To 51 single example: VCC ? 5V GND ? GND DIN ? P2.2 CS ? P2.1 CLK ? P2.0 Package included: 3* MAX7219 Dot Matrix Module See more

5. Modules with input and output interfaces, support for cascading multiple modules. 4. Holes with four screws, diameter 3mm. 3. Module dimensions: length 3.2 cm X 3.2 cm wide X 1.5 cm high. 2. Module Operating voltage: 5V. 1. Single module can drive an 8 * 8 dot matrix common cathode.