MAX7SegmentDisplay is an Arduino library for MAX7219 and MAX7221 8 bit 7-segment digital LED display module drivers.

Arduino library install guide

Or you can copy DigitLedDisplay library to -> arduino\libraries\

Start From Digit: Default Value Zero
max.printDigit(1234);

Start From Digit 4
digitLedDisplay.printDigit(1234, 4);

Image credit: the images above are from the original library by Ozhan Duran and are used here with attribution.

#include <MAX7SegmentDisplay.h>

// initialize with pin numbers for data, cs, and clock
MAX7SegmentDisplay max = MAX7SegmentDisplay(11, 8, 13);

void setup() {
  max.setBright(15); // range is 0-15
  max.setDigitLimit(8);
}

long i = 12345678;

void loop() {
  max.printDigit(i++);
  delay(10);
}

For additional features see Digit7SegmentDemo.ino

This library supports reversing the order in which digits are written to the display.

• setReverseDirection(bool rev)

  • Call with true to enable reverse printing, false to restore normal order.
  • Example: max.setReverseDirection(true); max.printDigit(1234); — the digits will be sent in reverse order.

• ReverseDirection()

  • Compatibility helper (older API). Calling max.ReverseDirection() will enable reverse mode (equivalent to setReverseDirection(true)).

Note: Reverse mode affects only the order the library writes digit values to the MAX chip; it does not change wiring or physical orientation of the module. Use setReverseDirection(false) to return to the default behavior.