thank you for your attention, but i'm not NASA , sometimes I like to test and try just to do it and understand how the stuff works a little deeper, that is DIY approces!!!
Why you use arduino UNO? I use to discover new things and open my mind.
After all, there were many other sophisticated and reliable (and $$$) stuff out there!!
When I say TEST my "self made" oscilloscope, I ment draw a sine wave on a LCD that seems to be a sine wave...stuff like these...
Please do not hijack the topic on Why you are doing something....
To be honest one of the thing I wanna try is to draw very simple Lissagiouss curves (XY mode) with my self made oscilloscope and for me is a HUGE target draw it properly.
Doing that I discovered many new things about sinusoids, arduino timers, ADC/DAC and many other thing that for me (junior chemical engeneer) is not a part of my daily work or backgroud.
Sometimes (i'm sure of that) your first prototipe sucks but working on it you are able to find a good compromise on what you want and what you can do with your budget isnt'it??
I came back to my first topic question:
Is there a way to generate Two freq. variable Waves on two pins of an arduino UNO ??
I try these two ways, without success:
SPWM have strong limitation due to the internal arduino's Timers. I'm able to create a Single Wave, but not two
R2R DAC Ladder requires a lot of pins for a 8bit wave + 1 rotary encoder = Not enought Pins....
Do you know some other way to explore?
I was thinking; maybe ArduinoMega is suitable for SPWM because the larger numer of pins and timers?
Horace give me a good IC component to achive the target.
Thank you all for your effort,