Programming Reference/Librarys
Question & Answer
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Stops the generation of a square wave triggered by tone(). Has no effect if no tone is being generated.
NOTE: if you want to play different pitches on multiple pins, you need to call noTone() on one pin before calling tone() on the next pin.
noTone(pin)
pin: the pin on which to stop generating the tone
nothing
* tone()
Source: arduino.cc