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The Arduino is used only for counting pulses from the flow meters, right? Have you considered using a Dallas 1-wire counter, DS2423? Unfortunately it is obsolete and hard to find these days, however you can emulate one on an ATtiny microcontroller...

RJ-11 FTW! Once you have all of your sensors wired to RJ-11 pigtails then it's truly plug-and-play. You can use phone splitters like that to make a "local" 1-wire network very easily. Plus, standardising on this connector lets you move sensors around and swap them between different devices...

It's just Python. You could hack on the relay module, which is very simple, or write a new module and import it to the main code. Probably you should use 1-wire filesystem (OWFS). I have had trouble getting the w1 modules other than w1-therm working.

I think it's just as easy to plug in to the GPIO pins (once you have soldered them on). The minimal RPi Zero implementation looks like this: You can also plug in an LCD and rotary encoder, but they are not required to make it work. I will test this configuration in September.

Excellent! Thank you for testing. I hope it all goes smoothly. Please report your experiences (good, bad or ugly).

Thanks to the power of open source I am at work teaching Summer Camp, but some guy on the other side of the world has offered a fix. Thank you! I accepted the Pull Request. @joebob296, please would you like to try it?

Oh. That's a new one. I will have to look at it in detail. I am at work this morning, but I should have some time this evening.

Ok. Then it's another bug somewhere. Can you report the full error message please? It will give the module name and line number.

It should be instant.

Can't you just download the image from here? https://downloads.raspberrypi.org/raspbian/images/ Looks like the latest is May of last year. The best solution would be to fix the software so that it works with Jessie. What exactly is the problem?

So you will log data on the ESP8266 and run the webserver on it too?

Here's a link to a similar project: https://wp.josh.com/2014/06/23/no-external-pull-up-needed-for-ds18b20-temp-sensor/

I have only one fermenter. I find that it takes about a month from start to bottling for most beers, and then another month would be the minimum aging time. Even though I have 5 beers in the cellar, they are going down at an alarming rate. This means I have to buy more beer to supplement my...

AlehCemy beat me to it, but yes, someone has been working on that. Another option is to run my Python code on a Pi Zero and get rid of the Arduino entirely.

The original Raspberry Pi was horribly broken for a while. Then it all got fixed. No reason to think that won't happen again. What exactly is broken on the Pi 3? I haven't noticed.

I have been following the thread. I have two Pi 3s. They work. They are better than Pi 2s.

I don't know why you wouldn't choose a Pi 3. BrewPi is just software.

I don't think it has been integrated, otherwise it would be documented (and would be visible). Basically, you open a serial link to your Arduino, using screen, or minicom, or gtkterm, or your favourite serial terminal program, then send some commands and read the responses.

Here's some more info on how to do it: http://forum.brewpi.com/discussion/448/temperature-probe-calibration

I used some pvc tube and a brass ball-valve. Put one end of the tube in the beer. The other end has the valve. Open the valve and suck on the end to start a syphon. I used a wide drinking straw pressed into the valve for hygiene reasons. Once the syphon has started close the valve and...