Pulse

int led = 1;
int led2 = 2;
int led3 = 3;
int led4 = 4;
int led5 = 5;
int led6 = 6;
int led7 = 7;

// initialize the digital pin as an output
{              
pinMode(led, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
pinMode(led6, OUTPUT);
pinMode(led7, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led6, HIGH);
delay(10);
digitalWrite(led6, LOW);
delay(100);

digitalWrite(led4, HIGH);
delay(10);
digitalWrite(led4, LOW);
delay(100);

digitalWrite(led2, HIGH);
delay(10);
digitalWrite(led2, LOW);
delay(100);
 
digitalWrite(led5, HIGH);
delay(10);
digitalWrite(led5, LOW);
delay(100);

digitalWrite(led, HIGH);
delay(10);
digitalWrite(led, LOW);
delay(100);

digitalWrite(led3, HIGH);
delay(10);
digitalWrite(led3, LOW);
delay(100);

digitalWrite(led7, HIGH);
delay(10);              
digitalWrite(led7, LOW);
delay(100);            
}