Arduino UNO Problem mit LCD Shield

International Deutsch
11

Den folgenden Sketch habe ich durchlaufen lassen. Alle LED haben geblinkt, nur die LED an Pin 5 blieb dunkel

void setup() {                
  // initialize the digital pin as an output.
  // Pin 4, 5, 6, 7, 8, 9 has an LED connected on Arduino UNO board:
  pinMode(4, OUTPUT); 
  pinMode(5, OUTPUT);  
  pinMode(6, OUTPUT);  
  pinMode(7, OUTPUT);  
  pinMode(8, OUTPUT);  
  pinMode(9, OUTPUT);  
  
}

void loop() {
  digitalWrite(4, HIGH);   // set the LED on
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);
  digitalWrite(9, HIGH);
       
  
  delay(1000);              // wait for a second
  digitalWrite(4, LOW);    // set the LED off
  digitalWrite(5, LOW); 
  digitalWrite(6, LOW); 
  digitalWrite(7, LOW); 
  digitalWrite(8, LOW); 
  digitalWrite(9, LOW); 
  
  delay(1000);              // wait for a second
}