A router as a switch ought to be galvanically isolated at the in and outputs. Aside from that, the data is digital and should not easily show the sort of noise as seen in the roast profile. Recently I noticed some artifacts showing in Artisan were caused by my cell phone being close to the VINT hub,...

FC happens at 199'C on mine, hottest charge dunno...yet I usually charge at 275'C yet that is not a relevant number using a perforated drum (I tend to think that BT reflects air temp without beans) I missed your FC temp, with that it might be that your drop temp is comparable...waitinf for FC to bec...

did you try charging hotter, and dropping a bit hotter? I have great results from Ethiopian greens using the Huky with 400g batches in a perforated drum (yes a completely different animal) charging at around 275'C reaching dry end at <4 min dropping at 206-207C about 45-60 sec post FC

it does, if you try the laptop without charger and see the same noise it's not that... You can check the leads of the TC to rule out a whacky contact somewhere, or try a different laptop/USB cable etc. YET...RTDs made me believe I can roast...as on top of the curve rather than trying ot catch up wit...

if 'IT' is my setup then yes

indeed, laptop on it's PSU makes it so much more noisy! I changed to RTDs a few years ago and have never looked back....so much faster and less noisy making controlling a roast a reality

you can also connect all in series and them measure the resistance...divide by the number of heater rods and you get the individual power rating

Looks like fun! I tinkered with an electric pizza oven for a while, trying to reach heat nirvana...ended up buying a gas fired proper pizza oven I'm trying to understand the why, is it 'just because I think it'll work' or is there a compelling reason to change to electricity?

Given the variablity of a larger grind I'd also vote for a cheap (turkish grind or similar) hand mill, at 4 points difference within a sample the result is IMHO pointless as eyeballing color against a chart is about as accurate

With that grind size caution should be taken to make a couple of measurements to take out the variability caused by grind size (easily 4 points max at this size). I did some testing to understand variability and concluded that a grind finer than for slow espresso has less than 1 point variance