I ran a test last night to see how fast the hottop can get 200 grams of green to 1st crack.
I used a harrar I had.
Preheat to 175 for 5 minutes, charge roaster, bean temp dropped to 140. 1st crack was ~10:30 later with bean temp @345.
Seems my bean probe is either too slow or inaccurate, but as long as I know ~ where 1st crack will happen I can set the profile to that point.
I'm going to try 100 grams next to see if I can accurately bring that to 345 in 10:30 also.
Then onto tweaking the code to stabilize the roast.
to answer mikepetro's question, yes damper is the solenoid that ejects the beans.
Pinout is as follows, all 5v logic from the control board.