void setup()
{
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
pinMode(7, OUTPUT);
}
void loop()
{
digitalWrite(5,HIGH);//LED1 ON
digitalWrite(6,LOW);//LED2 OFF 
digitalWrite(7,LOW);//LED3 OFF
delay(2000);
digitalWrite(5,LOW);//LED1 OFF
digitalWrite(6,HIGH);//LED2 ON
digitalWrite(7,LOW);//LED3 OFF
delay(1000);
digitalWrite(5,LOW);//LED1 OFF
digitalWrite(6,LOW);//LED2 OFF
digitalWrite(7,HIGH);//LED3 ON
delay(3000);
digitalWrite(7,HIGH);//LED3 ON
digitalWrite(5,HIGH);//LED1 ON
digitalWrite(6, HIGH);//LED2 ON
delay(5000);
digitalWrite(6,LOW);//LED2 OFF
digitalWrite(7,HIGH);//LED3 ON
digitalWrite(5,LOW);//LED1 OFF
delay(1000);
digitalWrite(5,HIGH);//LED1 ON
digitalWrite(6,HIGH);//LED2 OFF
digitalWrite(7, LOW);//LED3 OFF
delay(1000);
digitalWrite(5,LOW);//LED1 OFF
digitalWrite(6,HIGH);//LED2 ON
digitalWrite(7,LOW);//LED3 OFF
delay(1000);
}