Oscilloscope can detect and read any change in waveform in terms of changing voltage and the graph is plotted on a screen. A real life scope is much complicated and comes with a lot more features.
But this kind of relay oscillator is good for beginners and offers the basic functions and can interpret a waveform quite accurately.
The official download link for the SOFTWARE and SKETCH is : http://efymag.com/admin/issuepdf/PCBasedOscilloscopeUsingArduino.zip
Also you can download from here :
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