Introduction :
MAX7219 Dot Matrix Module.
- A single module can drive an 8 x 8 common cathode lattice
 - Operating voltage: 5V
 - Size: 5 x 3.2 x 1.5 cm (L x W x H)
 - LED color: red
 - With four screws hole, aperture 3mm
 - With input and output interfaces, supports multiple modules cascade
 
Connections :
- The module left side as an input port and the output port on the right
 - To control a single module, just connect the input port to the CPU
 - When cascading multiple modules, the input port of the first module connect to the CPU, the output port connect to the input port of the second one, and so on.
 
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