// Aurduino use C/C++ Programming
// C/C++ Programming is case-sensitive
int ledPin = 12;
int ledPin2 = 13;
 // change this value to 13 to blink green led
void setup() {
  // pinMode() function set a certain pin to INPUT or OUTPUT
  pinMode(ledPin, OUTPUT); 
  pinMode(ledPin2, OUTPUT);
  // set pin #8 as OUTPUT pin
}
void loop() {
  digitalWrite(ledPin, HIGH); // write a digital signal HIGH to pin 8
   delay(1000); // CPU pauses for 1000 millisecond (1 second)
   digitalWrite(ledPin, LOW); // write a digital signal LOW to pin 8
  delay(1000); // CPU pauses for 1000 millisecond (1 second)
digitalWrite(ledPin2, HIGH); // write a digital signal HIGH to pin 8
   delay(1000); // CPU pauses for 1000 millisecond (1 second)
   digitalWrite(ledPin2, LOW); // write a digital signal LOW to pin 8
  delay(1000); 
}