Module parameters: 1. A single module can drive an 8 * 8 cathode dot matrix 

2. Module operating voltage: 5V 

3. Module size: Length

3.2 cm X Width 3.2 cm X Height 1.3 cm 

4. Equipped with 4 fixed screw holes, with a diameter of 3mm 

5. The module comes with input/output interfaces and supports cascading multiple modules 

Wiring instructions:

 1. The left side of the module is the input

port, and the right side is the output port. 

2.When controlling a single module, simply connect the input port to the CPU 

3.When multiple modules are cascaded, the input of the first module is connected to the CPU, the output is connected to the input of the second module, the output of the second module is connected to the input of the third module, and so on ..

• 1 x MAX7219 Dot matrix module MCU control Display module