I'm planning to do a similar mod to my Traeger. I think I will try to do one step further and add a profile function, so that it will change temp after a preset time, since i often get busy and forget to switch from high to smoke or some other fail. A couple questions, could you share code you used for on/off control? the standard traeger control is a little unusual, so i'm curious how you did it or did you just make it variable speed.
What are you using for a temp sensor?
Do you do anything special to start the grill?
I woke up this morning planning this in my head and am now inspired by your success.