Setup of command and detection of tonal sequence.
命令设置和音调序列检测。
Your first tonal sequence should be simple: two low tones with 0.5 seconds between them for a "beep beep."
第一个音调序列应当很简单：两声低音哔哔，间隔为0.5秒。
Your first tonal sequence should be simple: two low tones with 0.5 seconds between them for a "beep beep."
第一个音调序列应当很简单：两声低音哔哔，间隔为0.5秒。
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