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@@ -1,5 +1,20 @@
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## alternatives:
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+[rgco: Multichannel Arduino Oscilloscope](https://www.instructables.com/Another-Arduino-Oscilloscope/)
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+
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+> The 16MHz Arduino clock is too fast for the ADC to operate properly, therefore it needs to be prescaled.
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+> Prescale factors of 1 (no prescale) to 128 can be selected.
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+> By default, the Arduino IDE sets the prescale to 128,
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+> resulting in an ADC-clock period of 128/16MHz=8 microseconds,
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+> and thus a sampling period of `13*8=104` microseconds.
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+> Many tests have shown reducing the prescale to 16 results in only a slight loss of precision,
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+> while even faster clocks result in garbage.
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+
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+> The Arduino ADC can be operated in single acquisition or free running mode.
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+> The standard analogRead() function does a single acquisition and returns the value when the ADC is ready.
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+> […], it is also possible to use a loop and poll for the ADIF flag which indicates that the ADC reading is complete, […]
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+
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+
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[pcscope](https://www.electronicsforu.com/electronics-projects/pc-based-oscilloscope-using-arduino)
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([source](http://efymag.com/admin/issuepdf/PCBasedOscilloscopeUsingArduino.zip))
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