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  pippy.sound.playSine(f, 5000, t, 0)
 
  pippy.sound.playSine(f, 5000, t, 0)
 
  pippy.sound.audioOut()
 
  pippy.sound.audioOut()
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===Using frequency to control outputs===
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Turtle Art is programmed to produce two different frequency sounds. The headphone output of the XO is connected to a pair of LM567 tone decoders, each of which lights a LED when its input signal frequency is present. With this principle we could control any device based on the frequency emitted by the XO.
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"Physics with XO. " Trinidad Guzmán.
    
==FSK Teletype==
 
==FSK Teletype==
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