BenB wrote:It likely is a PID type algorithm. Which makes me wonder whether a Sesto would work or whether the timescales involved would be too great. That's one advantage of using a well insulated chamber with a low power heater / cooling solution. The level of heating / cooling required is so low that lag isn't really a problem. The thermal capacity of a thermowell isn't an issue if the temperature is changing very slowly.
It's definitely a PID algorithm but I think the sestos type PIDs only have one control output, whereas the BrewPi has heat/cool. Perhaps more importantly, the Brewpi is also working off multiple inputs - both fridge and beer temps - which may mean that it can do a much better job. In any case, I just weakened and ordered the spark, now off to order a Pi from Amazon and start thinking about making a nice job on my fridge conversion..
