Last week when I restarted this projected I listed out the steps necessary to get a minimum viable product, i.e. the bare-minimum I needed to monitor and control the temperature of my fermenting beer. I've now got this up and running and my two fermenting beers are safe! The next step is to setup temperature profiling before the next brew day (1st week of April).

Temperature profiling: The program should accept multiple temperature set points with corresponding time intervals. For example, to make my favorite munich lager I would use this profile: Start at 48F for 1 day to match pitch temperature, hold at 48F for 4 days, raise to 53F for 4 days, raise to 60F for 4 days (diacetyl rest), ramp down temperature 4F per day to hit 33F and then hold for 6 weeks (lagering).

So far, the project has been hacked together with random bits of wires/project boards and the software is a mess... Eventually I'll need to go back and clean this up, but for now I want to keep the momentum going and knock out the final objective of the base project

I wanted to add a specific gravity measurement to this project, it would be really interesting to see how gravity changes during the fermentation process. There are some solutions out there -a bluetooth enabled hydrometer called Tilt and a bluetooth enabled bubble counter that fits on top of the airlock. I don't like either of these solutions, so I've been trying to figure out how to measure gravity using mass and volume. My first attempt will use a scale/stress gauge to measure mass and a time-of-flight sensor to measure the beer liquid level to determine volume. I'm ordering those parts now, should have them arriving to play around with next week.

I also pulled the step files from this awesome keezer build in hackaday by Ben Brooks (https://hackaday.io/project/167023-keezer-kegtapbeer-controller). Working with a buddy to print these out, I think the scale he's designed would work well for determining the mass.