iSpindle: Track your homebrews with an opensource MQTT hydrometer temperature sensor

If your into brewing beer, wine, cider or maybe even meads, then this opensource project is worth checking out. It is very easy to get going in openHAB, because it can be setup with MQTT without any clouds and be auto detected and added via openHAB’s home assistant support. Just tick the box in the ispindle control panel to enable the home assistant support which sends extra MQTT topics that openHAB can use to detect and add a thing with channels ready for you to use.

I did a search on this forum for all the major hydrometer brands and found no one had posted they were using one. For around $15 to build your own based on a esp8266, it is well worth the time. I can now enter in the starting gravity and a rule will calculate how much alcohol is in the brew and an alert can be sent when I reach a target gravity or ABV%

If you don’t want to use breadboard and no 3d printer, there are PCB’s for sale on ebay and even people selling ready made models fully calibrated on etsy.
Mine is made from the PCB here so you can order a number of boards and make a batch to share with people in your area:

First brew of a cider worked well.

Have it turned off at the moment so all sensors are not giving a reading.

Project is found here:


It’s getting close to my next brew day. Very timely posting. :smiley: :beers:

I tend to be lazy and not want to sanitize mid-fermentation so I just wing it and hope for the best. This could be a game changer for me.

Some breweries will ‘open ferment’ and allow wild yeast to fall into the wort that are in the air. When there is an active yeast the risk is ‘probably’ low, so long as what you put in is clean. Having an internal temperature reading means you can automate heating to closer regulate the brews temperature or even cooling if you have an old fridge.

Definitely give it a go as they are very convenient to check the readings whenever you want to. Also the PET bottle blanks that they are made from are seriously strong, you will never break one of these and the battery will last 6 months at a 1 minute upload rate.

Yep, but those aren’t my favorites. I’m a boring beer drinker: wits, dunkels, hefeweizens and the like. Though I do like a nice triple every now and then. I don’t care for sours nor for trying to jam as many hops into the process as possible.

Unfortunately I’ve managed to infect far too many attempts so I’m a little gun shy about taking risks after it’s in the carboy. I should loosen up, but building one of these would give me the best of both worlds. I can be lazy and still be certain when the yeast is done.

It would definitely help out more with my mead experiments. My last batch came out pretty decent but I was just guessing at that point because I broke my hygrometer when it came time to bottle. And this spring I want to try my hand at another batch of rhubarb melomel. It was ok to start but after a year in the bottle my first batch became quite nice.

Yep, I could. But despite all the work I put into home automation, I tend to treat my other hobbies in a lazy way. I didn’t even weed my garden this year, which is all OK since the deer got most everything but the zucchini and bush beans.

I don’t have a way to control the temp nor a good place to put an old fridge. I currently put the carboy in a dark room in the basement and cross my fingers. Luckily yeast can be somewhat forgiving and I’m not looking to sell this stuff so if it takes a little longer or doesn’t come out just right it’s OK.