“Well I had been working on this simple, but sometimes useful meter based on Arduino Nano. It can read battery voltages to 10% of actual value (as long as it is below 10V), it can measure resistance quite well (better with resistors from 10k-200K), has a pretty useful continuity tester, and finally an “Oscilloscope” which in this case only reads voltage at pin A2 really fast to create a graph. However all of it is quite useful when needed.
This is not a proper tutorial, I am just sharing what I made with my code. I will update instructions in a day, so if you are interested follow up again.”