Arduino signal generator

[forest]

Beautiful! Could you post two outputs on the same plane , because it looks a bit shifted in phase (not pure 180 degrees) ?

[kEhYo77]

It is 100% 180 deg. shifted phase corrected mode.
The output looks distorted only at this max frequency.

[forest]

I'm interested if there is possibility to change the slope rising time especially to make it more sinusoidal :-) by any eternal filter maybe ?

[kEhYo77]

I am afraid not. This method uses hardware timer registers to do the magic using mainly hardware and no software.
You can try to adapt my previously posted code for Figuera in this thread where I use sine table values.
You can "draw" in this table any shape you want.

[TinselKoala]

Nice work!

Tested and verified to work with Arduino UNO R3, so it will most likely work on all members of that family (nano, promini, etc.). I have not yet tested it on a MEGA.

Probably a good idea to specify that all 3 pots should be same value. 10K is good, 50k is probably better. The pots are effectively in parallel so they interact somewhat.

It might be interesting to eliminate the pots and just use the serial monitor to send values instead. But since this sketch depends on having the actual inputs at analog pins A0, A1 and A2 to work, instead of just arbitrary variable values, it might take a little fiddling to enable serial functionality.