Yes! I've got a handful of these in the hands of homebrewers that are testing as we speak. I am putting together documentation and integration support as well so this will be something that folks of any technical level can set up, and use in various different applications.Any updates?
I have a Wi-Fi load cell hookup in my keezer that works fine. I put my load cell unit on a platform that is itself suspended off the keezer floor, sitting on 4 screw legs. Thus, it shouldn't get wet.To @Dexlor, load sensors have been tried, but there are intrinsic issues - like putting devices at the bottom of a cold cabinet that might get swampy at times (which pretty much kills any notion of using an actual digital scale) along with load cell drift innate to the tech...
There will be plenty of pictures and documentation on this. I am still working on getting it put together and changes are being made based on user-feedback. The last thing I want is a bunch of people repeating the mistakes I've made when building thisSo we'll never see a picture of the sensor side?
Thanks for posting pics @LBussy, and thanks for your feedback!Not sure if Derrick wants us to post pics, since there may be changes from what we have in our hands. That said I can tell you that this is very well thought out.
I find it interesting, as a guy who tries to support Homebrew software, the way he's approached this. A lot of our projects have a common theme even if it's a completely different product. I think that comes from us having used the other Homebrew products. Derrick has come at this with a clean slate and, well, it's just cool how he's done things so uniquely.
I'm not sure he was ready for me to be as honest as I was in some places, but he took it like a champ and is addressing those areas. Also, keep in mind this is in "productive use" right now on his stuff, so what I mentioned to him qualifies more as edge case stuff and is a product of what I've seen some of you break in the past.
Load cells are another great measurement methodology. I had thought about doing something like this instead of the lid, but I did like the pressure capability of the lid. Even bought some load cells to play with...I have a Wi-Fi load cell hookup in my keezer that works fine. I put my load cell unit on a platform that is itself suspended off the keezer floor, sitting on 4 screw legs. Thus, it shouldn't get wet.
Drift is very minimal so far, less than a pints' worth. Plus, perfection is the enemy of good. To me, worrying about absolute exactitude in volume left seems overly type-A.
The advantage of a load cell is that it can also be used as a proxy for fermentation gravity. I ferment in kegs, so when the weight of the keg stops decreasing, via CO2 being released, fermentation is done!
CO2 density at STP is 1.977 g/L. A 5 gal fermentation of a medium gravity wort results in 400 - 500 L (@ STP) of CO2 being generated, so weight loss of the fermenter would be in the range 791 - 989 g ( 1.74 - 2.18 lb.)...
Load cells are another great measurement methodology. I had thought about doing something like this instead of the lid, but I did like the pressure capability of the lid. Even bought some load cells to play with...
I'd be really interested in the success you had with measuring a change in gravity. It seems like the accuracy of the load cell would have to be pretty high to be able to measure the change in specific gravity of a known volume. I experimented quite a bit a while back with differential pressure of submerged transducers at a known height differential and those sensors had to be extremely accurate. Not to derail the conversation too much...
I had seen the picture with the cover before. I am interested in seeing the parts below the cover. But thank you for your effort.