Tones are generated by setting up a timer in RTC mode and toggling an output pin (in an Interrupt Service Routine) when the timer reaches a value determined by the contents of its OCR register.With the maximum prescalar value of 1024, any frequency less than 31 Hz would require a value of greater than 255 in the timer's OCR register.Since Tone uses Timer2 and Timer2 is an eight bit timer, frequencies less than 31 Hz are not possible.
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