I don't have a proper oscilloscope. I don't have the budget to buy one, even a used one. I have to roll my own. :(
The plan is to use an Arduino Leonardo or Due as a combined A/D and USB interface and write an app on my Mac to display the waveform. Now the problem is how should I give it V/div options without losing resolution?
I am wondering whether this will work:
By changing the AREF voltage I can change the full range voltage of the DAC. Will this produce the effect of giving me lower V/div without losing resulotion?
For higher V/div, would a simple single digital pot work?