/*program to blink two LED on arduino Uno*/
int led1=13;
int led2=12;
int i=0;
void setup() {
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);  
}

void loop() {
  for(i=0;i<=5;i++){
    digitalWrite(13, HIGH);

    //delay(50);
    
  }
  for(i=6;i<=10;i++){
    digitalWrite(12, HIGH);
    delay(50);
    digitalWrite(12, LOW);
    delay(50);
  }
}