Chinese make MAX7219 4-in-one Matrix display
Max7219 - VCC - 5V
Max7219 - GND - GND
Max7219 - DIN - MOSI (D7)
Max7219 - CLK - SCK (D5)
Max7219 - CS - D4
Chinese make MAX7219 4-in-one Matrix display
Max7219 - VCC - 5V
Max7219 - GND - GND
Max7219 - DIN - MOSI (D7)
Max7219 - CLK - SCK (D5)
Max7219 - CS - D4