Arduino Audio Oscilloscope

The are a few arduino Oscilloscope projects but they only have a sample rate of 10k. I found this article  by Glen Sweeny using the ADC interrupts by using 8 bits  and a higher adc clock I should be able to run at higher speeds. Collecting a set of results and then sending them out serially would improve the speed. FirstlyI copied the program and got a compiler error.  I removed sections of code and it turned out the compiler din’t like the global variables in the interrupt service routine.

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