#include <TM1637Display.h>

#define CLK1 3
#define DIO1 2

#define CLK2 5
#define DIO2 4

#define CLK3 7
#define DIO3 6

#define CLK4 9
#define DIO4 8

TM1637Display display1(CLK1, DIO1);
TM1637Display display2(CLK2, DIO2);
TM1637Display display3(CLK3, DIO3);
TM1637Display display4(CLK4, DIO4);

int numCounter = 0;

void setup() {
  display1.setBrightness(0x0a);
  display2.setBrightness(0x0a);
  display3.setBrightness(0x0a);
  display4.setBrightness(0x0a);
}

void loop() {
  for (numCounter = 0; numCounter < 1000; numCounter++) //Iterate numCounter
  {
    display1.showNumberDec(numCounter); //Display the numCounter value;
    display2.showNumberDec(numCounter * 10); //Display the numCounter value;
    display3.showNumberDec(numCounter * 100); //Display the numCounter value;
    display4.showNumberDec(numCounter * 3); //Display the numCounter value;
    delay(100);
  }

}