int led1pin = 12;
int led2pin = 2;
void setup() {
  // put your setup code here, to run once:
pinMode(led1pin, OUTPUT);
pinMode(led2pin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(led1pin, HIGH);
delay(50);
digitalWrite(led1pin, LOW);
delay(50);
digitalWrite(led2pin, HIGH);
delay(50);
digitalWrite(led2pin, LOW);
delay(50);
}