Blinking of two LED at a time programming by ARDUINO





// program for two LEDs on at a time and two LEDs off at same time
//BY-ALOK KUMAR PANDEY
//.................................................................................//

int led1=13, led2=12, led3=11,led4 = 10;
void setup() {
  pinMode(led1, OUTPUT);         // here pin 13(i.e. led1) set as output pin
  pinMode(led2, OUTPUT);         // here pin 12(i.e. led2) set as output pin
  pinMode(led3, OUTPUT);         // here pin 11(i.e. led3) set as output pin
  pinMode(led4, OUTPUT);         // here pin 10(i.e. led4) set as output pin

}

void loop() {
 digitalWrite(led1, HIGH); 
  digitalWrite(led2, HIGH);  
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW); 
  delay(1000);  
 digitalWrite(led1, LOW); 
  digitalWrite(led2, LOW);  
  digitalWrite(led3, HIGH);
  digitalWrite(led4, HIGH);
  delay(1000); 
}




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