#include <TM1637.h>

const int CLK = 2;
const int DIO = 3;

TM1637 tm(CLK, DIO);

void setup() {
  tm.init();
  tm.set(BRIGHT_TYPICAL);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
}

unsigned int counter = 0;

void loop() {
 tm.display(0, (counter / 1000) % 10);  
  tm.display(1, (counter / 100) % 10);   
  tm.display(2, (counter / 10) % 10);    
tm.display(3, counter % 10);           

  counter++;
if (counter == 50) {

    digitalWrite(6, HIGH);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    tone(12,1000,1000);


  }
  if (counter == 100) {
    digitalWrite(6, LOW);
    digitalWrite(5, HIGH);
    
  }
  if (counter == 150) {
    digitalWrite(5, LOW);
    digitalWrite(4, HIGH);
    
  }
  if (counter == 200) {
    digitalWrite(4, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(5, HIGH);
  }

  if (counter == 250) {
    counter = 0;
    digitalWrite(4, LOW);
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
  }

  delay(100);
}