Update README.md

Author: avandalen

README.md

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 # Arduino Visual Debugging Oscilloscope AVDO
 AVDO is a powerful tool to display and analyze real-time internal data signals inside or outside a microcontroller in a graphical way.
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 It is intended for debugging where the serial monitor is too slow.
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 No special hardware is required.
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 See the website:
 http://www.avdweb.nl/arduino/libraries/oscilloscope.html