q y q y yp g
duration：the duration of the tone in milliseconds (optional). Allowed data types: unsigned long.
noTone(pin)
Description: Stops the generation of a square wave triggered by tone(). Has no effect if no tone is being generated.
Parameter:
pin：the Arduino pin on which to stop generating the tone
frequency：the frequency of the tone in hertz. Allowed data types: unsigned int.
duration：the duration of the tone in milliseconds (optional). Allowed data types: unsigned long.
8.4 Interrupt
attachInterrupt(digitalPinToInterrupt(pin), ISR, mode)
Description: External Interrupts
Parameter:
pin：the Arduino pin number.
ISR：the ISR to call when the interrupt occurs; this function must take no parameters and return nothing. This function is sometimes
referred to as an interrupt service routine.
mode：defines when the interrupt should be triggered. Four constants are predefined as valid values:
detachInterrupt(digitalPinToInterrupt(pin))
Description: Turns off the given interrupt.
Parameter:
interrupt: the number of the interrupt to disable
pin: the Arduino pin number of the interrupt to disable
interrupts（）
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