Add a new Buzzer.beep() helper method

Author: alranel

docs/readme.md

@@ -170,6 +170,12 @@ Equivalent to noTone(), it will stop the tone signal
 Buzzer.noSound()
 ```
 
+To emit a beep you can use the `beep()` method:
+
+```
+Buzzer.beep();
+```
+
 ### Relay class
 
 Control both relays and get the status of them

src/Arduino_MKRIoTCarrier_Buzzer.cpp

@@ -35,3 +35,9 @@ void MKRIoTCarrier_Buzzer::sound(int freq){
 void MKRIoTCarrier_Buzzer::noSound(){
     noTone(_pin);
 }
+
+void MKRIoTCarrier_Buzzer::beep(int freq, unsigned long duration) {
+    carrier.Buzzer.sound(freq);
+    delay(duration);
+    carrier.Buzzer.noSound();
+}

src/Arduino_MKRIoTCarrier_Buzzer.h

@@ -31,6 +31,8 @@ class MKRIoTCarrier_Buzzer{
     void sound(int freq);
 
     void noSound();
+
+    void beep(int freq = 800, unsigned long duration = 20);
 
     private:
     int _pin;