Anycubic MAX7219 CWG 8-Digit Digital Display Control Module 8-Digit 7 Segment Digital LED Display Tube for Arduino MAX7219 is an integrated serial input / output common-cathode display drivers, which connects the microprocessor and 8 digit 7-segment digital LED display, you can also connect a bar graph display or 64 separate LED. A convenient four-wire serial interface can connect all common microprocessor. Each data can be addressed in the update without rewriting all displays. The entire device includes a 150A low-power shutdown mode, analog and digital brightness control, a scan-limit register allows the user to display 1-8 bit data, there is an all LED light detection mode. Only need three IO ports can drive eight digital tube,the module compatible of 5v/3.3v microcontroller. PCV board four corners of the fixed copper stud, which can effectively precent short circuit accidents happen.