//Binary Counter with 5 LEDs.

int led1=13;
int led2=12;
int led3=11;
int led4=8;
int led5=7;
int wait=1000;
void setup() {
  // put your setup code here, to run once:
 pinMode(led1, OUTPUT);
 pinMode(led2, OUTPUT);
 pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
 digitalWrite(led1,0);
 digitalWrite(led2,0);
 digitalWrite(led3,0);    // 00000 = 0
 digitalWrite(led4,0);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,0);
 digitalWrite(led3,0);    // 00001 = 1
 digitalWrite(led4,0);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,0);
 digitalWrite(led3,0);    // 00010 = 2
 digitalWrite(led4,1);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,0);
 digitalWrite(led3,0);    // 00011 = 3
 digitalWrite(led4,1);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,0);
 digitalWrite(led3,1);    // 00100 = 4
 digitalWrite(led4,0);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,0);
 digitalWrite(led3,1); // 00101 = 5 
 digitalWrite(led4,0);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,0);
 digitalWrite(led3,1);    // 00110 = 6
 digitalWrite(led4,1);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,0);
 digitalWrite(led3,1);    // 00111 = 7
 digitalWrite(led4,1);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,1);
 digitalWrite(led3,0);    // 01000 = 8
 digitalWrite(led4,0);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,1);
 digitalWrite(led3,0);    // 01001 = 9
 digitalWrite(led4,0);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,1);
 digitalWrite(led3,0);    // 01010 = 10
 digitalWrite(led4,1);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,1);
 digitalWrite(led3,0);    // 01011 = 11
 digitalWrite(led4,1);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,1);
 digitalWrite(led3,1);    // 01100 = 12
 digitalWrite(led4,0);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,1);
 digitalWrite(led3,1);    // 01101 = 13
 digitalWrite(led4,0);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,0);
 digitalWrite(led2,1);
 digitalWrite(led3,1);    // 01110 = 14
 digitalWrite(led4,1);
 digitalWrite(led5,0);
 delay(wait);

digitalWrite(led1,0);
 digitalWrite(led2,1);
 digitalWrite(led3,1);    // 01110 = 15
 digitalWrite(led4,1);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,0);
 digitalWrite(led3,0);    // 10000 = 16
 digitalWrite(led4,0);
 digitalWrite(led5,0);
 delay(wait);

digitalWrite(led1,1);
 digitalWrite(led2,0);
 digitalWrite(led3,0);    // 10001 = 17
 digitalWrite(led4,0);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,0);
 digitalWrite(led3,0);    // 10010 = 18
 digitalWrite(led4,1);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,0);
 digitalWrite(led3,0);    // 10011 = 19    
 digitalWrite(led4,1);
 digitalWrite(led5,1);
 delay(wait);

digitalWrite(led1,1);
 digitalWrite(led2,0);
 digitalWrite(led3,1);    // 10100 = 20  
 digitalWrite(led4,0);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,0);
 digitalWrite(led3,1);    // 10101 = 21   
 digitalWrite(led4,0);
 digitalWrite(led5,1);
 delay(wait);

digitalWrite(led1,1);
 digitalWrite(led2,0);
 digitalWrite(led3,1);    // 10110 = 22 
 digitalWrite(led4,1);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,0);
 digitalWrite(led3,1);    // 10111 = 23
 digitalWrite(led4,1);
 digitalWrite(led5,1);
 delay(wait);

digitalWrite(led1,1);
 digitalWrite(led2,1);
 digitalWrite(led3,0);    // 11000 = 24   
 digitalWrite(led4,0);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,1);
 digitalWrite(led3,0);    // 11001 = 25    
 digitalWrite(led4,0);
 digitalWrite(led5,1);
 delay(wait);

digitalWrite(led1,1);
 digitalWrite(led2,1);
 digitalWrite(led3,0);    // 11010 = 26    
 digitalWrite(led4,1);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,1);
 digitalWrite(led3,0);    // 11011 = 27    
 digitalWrite(led4,1);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,1);
 digitalWrite(led3,1);    // 11100 = 28     
 digitalWrite(led4,0);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,1);
 digitalWrite(led3,1);    // 11101 = 29    
 digitalWrite(led4,0);
 digitalWrite(led5,1);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,1);
 digitalWrite(led3,1);    // 11110 = 30   
 digitalWrite(led4,1);
 digitalWrite(led5,0);
 delay(wait);

 digitalWrite(led1,1);
 digitalWrite(led2,1);
 digitalWrite(led3,1);    // 11111 = 31
 digitalWrite(led4,1);
 digitalWrite(led5,1);
 delay(wait);
 
 // THE END //
}