const in pinLED = 5 ;
const in pinLED = 6 ;
const in pinLED = 7 ;
const in pinLED = 8 ;

void setup() 
{
    pinMode (pinLED1, OUTPUT);
    pinMode (pinLED2, OUTPUT);
    pinMode (pinLED3, OUTPUT);
    pinMode (pinLED4, OUTPUT);
}
void loop()
{
      digitalWrite (pinLED1, HIGH);
      delay(1000);
      digitalWrite (pinLED2, HIGH);
      delay(1000);
      digitalWrite (pinLED3, HIGH);
      delay(1000);
      digitalWrite (pinLED4, HIGH);
      delay(1000);
      digitalWrite (pinLED1, LOW);
      digitalWrite (pinLED2, LOW);
      digitalWrite (pinLED3, LOW);
      digitalWrite (pinLED4, LOW);
      delay(1000);
}