Hi Mike,

In the current format I use 4 pots, one for each channel, and having selected the manual temp setting option from the menu can set all 4 channels to whatever temps I need which are picked up when exiting out of the menu and back to the live screen. You could re-write the code to use one pot and cycle through each channel if you wished, however I preferred to use 4 pots.

No the pots are not locked as such, but you do need to select the menu option to adjust them. Once they have been set and the menu returns to the live screen you can twiddle the knobs as much as you like and it won't change the values - this does prevent accidental changing of the set temperatures.

I'm still working on taking the project from the development board to a working prototype, and once I've done that and had it running for a while I'll update the project with the final release of the code and some project notes.