This Arduino Oscilloscope project is a great idea. For people that are getting into electronics having a meter is good but having a scope is great. With this project you can take your $30 Arduino board and turn it into a oscilloscope, it won’t show you great detail or very fast circuits but often times that is not needed.
"This software allows you to get a visual representation of an analog signal using Arduino and Processing. The resolution is 10 bits so this is not like a real oscilloscope but it is still pretty useful. It works by sending values read from the Arduino board (pin 0) to Processing through serial communication."
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