const int ledred = 6;
const int ledblue = 9;



void setup() 
{
 pinMode(ledred, OUTPUT); //pinMODe aud OUTPUT setzen
 pinMode(ledblue, OUTPUT);
}


void loop()
{
 digitalWrite(ledred, HIGH); //LED einschalten 
 digitalWrite(ledblue, LOW);
 delay(500); // 300 millisekunden warten 
 digitalWrite(ledred, LOW); // LED ausschalten
digitalWrite(ledblue, HIGH); 
 delay(500);  // 300 millisekunden warten 

}