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readme: mention "pcscope" as potential alternative

Fabian Peter Hammerle 3 years ago
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+## alternatives:
+
+[pcscope](https://www.electronicsforu.com/electronics-projects/pc-based-oscilloscope-using-arduino)
+([source](http://efymag.com/admin/issuepdf/PCBasedOscilloscopeUsingArduino.zip))
+
+> By default, the ADC configuration of the Arduino gives samples every 116µs.
+> So here the ADC is configured with additional lines of code to get samples faster than 85µs by setting the prescaler to 16.
+> With this, you get ADC conversion every 20µs, […]