Features:Compact module with integrated 8x8 LED matrix displayIdeal for scrolling signs， message displays， large clocksVary brightness of whole display by programming one registerA convenient 3 wire serial interface can connect to Arduino， PIC， RasPiThe entire device includes a 150��A low-power shutdown modeModules with input and output interfaces ， support for cascading multiple modulesTwo ports (Input & Output) for easy cascading of modulesModule Operating Voltage: 5VWiring 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 CPU3. 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 on51 MCU， for example:VCC-5VGND-GNDDIN-P22CS-P21CLK-P20 Package Included:1 x MAX7219 8x8 Dot Matrix Module Kits