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Unterschiede

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+<code>
+int sensorPin = A0;    // select the input pin for the potentiometer
+int ledPin = 13;      // select the pin for the LED
+int sensorValue = 0;  // variable to store the value coming from the sensor
+int buzzerPin=8;
+int keyPin = 9;
+int frequency, oldfrequency = 0;
+boolean isOn = false;
+void setup() {
+  // declare the ledPin as an OUTPUT:
+  pinMode(ledPin, OUTPUT);
+  pinMode(keyPin, INPUT);
+}
+void loop() {
+  if (!digitalRead(keyPin)) {
+    // read the value from the sensor:
+    sensorValue = 0;
+    for (int i=0; i<=9; i++) {
+      sensorValue += analogRead(sensorPin);
+    }
+    frequency=(sensorValue/10) * 5 + 220;
+    if (frequency != oldfrequency) {
+      tone(buzzerPin, frequency);
+      oldfrequency = frequency;
+    }
+  } else {
+    noTone(buzzerPin);
+    oldfrequency=0;
+  }
+}
+</code>