??? What you do depends on how you intend the oscilloscope to interface with an Arduino or other interface or use the audio output of your Android device.
Here are some ideas to consider:
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Use sample sine wave audio tones in mp3 format Download Audio Tone Files Play the tone on your Android and create an interface to your oscilloscope to capture the audio from your Android's speaker.
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Generate a tone using an Arduino Tone generator with JavaScript. Frequencymeter with Arduino and possibly use sine wave signal with an interface to the oscilloscope.
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Here is a way to graph a sine wave Dynamic graph. Sinusoidal wave. Shift left graph
Provide audio output from your Android or a signal from your Arduino (or other interface) to your oscilloscope. You may have to provide an audio amplifier to the speaker audio or output from the minicomputer.
Regards,
Steve