Make an Oscilloscope - Pen Style (0 to 12 Volts direct) 

This is the simplest oscilloscope you could make. I made this to measure signals from 0 to 12 Volts directly without any switches. It is ultra sensitive and portable.
The app I used is called "Oscilloscope Pro 2" from the play store.
Feelings by STEAM PHUNK / steamphunk
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