Hi;

 

This is a first attempt at an Arduino Oscilloscope. Still incomplete; but basically does the job of plotting and recording 3 analog signals connected to 3 Arduino inputs. Controlling the H-sweep has been the greatest difficulty of the project for me. It has severe limitations regarding frequency response; but I want it mainly for very low frequency signals, such as temp, relative humidity, pressure, etc. At this point I have 3 simple potentiometers connected as voltage dividers  to the Arduino inputs to vary the voltage and observe the variations. Still a long way to go to finish it; but I can use it already.

 

here is the video: http://www.youtube.com/watch?v=14wGzvVhpnc&feature=youtu.be