Added debounce read function

src/main.cpp

@@ -7,8 +7,14 @@ int maxVolume = 64;
 int userVolume = 64;
 int oldUserVolume = userVolume;
 
+int buttonState;
+int lastButtonState = LOW;
+unsigned long lastDebounceTime = 0;
+unsigned long debounceDelay = 50;
+
 void volumeUp();
 void volumeDown();
+bool debounceRead();
 
 void setup()
 {
@@ -272,4 +278,35 @@ void volumeDown()
   digitalWrite(9, LOW);
   delay(1);
   digitalWrite(10, HIGH);
+}
+
+bool debounceRead(int buttonPin)
+{
+  int reading = digitalRead(buttonPin);
+
+  // If the switch changed, due to noise or pressing:
+  if (reading != lastButtonState)
+  {
+    // reset the debouncing timer
+    lastDebounceTime = millis();
+  }
+
+  if ((millis() - lastDebounceTime) > debounceDelay)
+  {
+    // whatever the reading is at, it's been there for longer than the debounce delay, so take it as the actual current state:
+
+    // if the button state has changed:
+    if (reading != buttonState)
+    {
+      buttonState = reading;
+
+      if (buttonState == HIGH)
+        return true;
+      else
+        return false;
+    }
+  }
+
+  // save the reading. Next time through the loop, it'll be the lastButtonState:
+  lastButtonState = reading;
 }