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As a datapoint, the Blichman 15g false bottom is rated for 1gpm ~3.8lpm max. When I ran it at 2.5gpm with 0.039" milling gap I'd sometimes get stuck mashes. I've since throttled it back to 1.5gpm and haven't had a problem. It depends on your milling gap and false bottom, but I've gone as low as...

PIDLibrary is already written for a real-time OS. How much more real-time do you get than a microcontroller? And using them from user-space Linux is fine too. Why would you need less than 10 milliseconds of response time to react to something that changes so slowly, such as 15 gallons of water...

I've been working on a project that has a web interface to a controller algorithm for the past 4 years now, starting with just Arduino w/ SPI wifi and a 2MB flash addition, then moving through various platforms as they became available. ATmega (Arduino): Real time operation, ADCs, digital I/O...

The high pressure gauges on CO2 tanks are virtually meaningless. They can only tell you the pressure of the gas inside the tank, but the majority of the CO2 is in liquid form. The gauge reads the same number until all the liquid has been converted to gas and then drop rather rapidly. At 70F the...

Sure, emperorcow, the code to my flow meter is in github Capnbry/flowknow. citywok, I was thinking the cheapest way to measure CO2 levels was simply measuring the weight using some of those fancy force strips. Not sure if they'd drift over time like a regular strain gauge would though. EDIT...

I've used the same flow meters in a recent project to measure my sparge rates and volumes: If you don't mind me spewing advice, here's what I found: -- Orient the flow sensors in the exact orientation you will use them in before calibrating. They show a large sensitivity to being rotated...

I have a problem. When I look at my brewery I think that if it is working, then it doesn't have enough features. Certain parts of the brewing process suggest specific liquid flow rates, but without instantaneous feedback, how can anyone ever really judge if they're doing it right? It seemed that...

I use RJ-11 phone cord because they're easy and securely snap in and I have plenty of old phone cords around to cut a end off of. I'm told you can also splitters and daisy chain multiple sensors together but I haven't tried that.

++to this. I used 2x 5 1/8" shanks in my initial build and they really get in the way when you try to put 4 kegs in. I used a 4 1/8" when I added my third tap and it is a little easier to work around. With a 1x6 collar and a piece of 1" foam insulation plus a sheet of hardboard backing, there is...

I have the GE 7.0cf model from Home Depot and just came back from trying to fit 4 ball lock kegs in it. They're in there so tight that I can almost lift the freezer trying to pull a keg out. I tried whacking the hump with a rubber mallet and it was no go as there were two lines that started to...

I have the 13.7cf version of this, which looks nearly identical except for all my shelves are wire rack and fixed. The cooling coils are all built into the back (as they are with any self-defrosting freezer I imagine) but the sides of my freezer definitely have condenser coils in them as they...

My Frigidaire 13.7cf frost-free upright freezer runs the defrost every 12 hours of accumulated run time. However, because I use an external temperature controller, it basically unplugs the freezer after every run cycle which resets the timer. I'm fairly certain (by checking graphs from my...

5 - 6 hours here too, all grain 5-8 gallon 4500W electric system 45 min strike heatup in HLT and mash tun, setup 60 min mash 15 min mash out 30-40 min sparge 20 min bring to boil 60 min boil 30 min chill 30 min cleanup I've considered stepping up to 5500W elements but that would save me...

I bought one of these for use as a fermentationn chamber but it turns out the picture on the walmart website isn't what you get so a better bottle didn't fit with an airlock. The video shows the proper configuration which is that there's no freezer coil at the top. The freezer is just a tray...

The reason I mounted my pumps horizontally was because I thought it would take too much space vertically to have the hose run down and back up to the inlet without kinking. I ended up flipping them upside down then rotating the heads 180 degrees and attaching them to the table top. Neither has...

Wow a 4.3 cubic inch fridge? It must be adorable! FermWrap is Flexwatt so the choices are the same. The fermwrap is just some Flexwatt with all the connectors and plug pre-installed. If you wrap your carboy with either one, you don't want to tape your temperature probe under or over it unless...

I use the TA4 version of this PID controller for my HLT and mash kettles (although the mash doesn't use the output). The PT100 hooks up the two same color wires to the B pins #12 and #13 and the odd colored wire to the A pins #10 and #11. I use a jumper between 10 and 11 but I'm not sure if it...

You definitely do not need to wash your yeast when you're saving it from a starter. The concentration of stuff you're trying to get rid of in the trub isn't as high as when you're taking it from an active fermentation. What I do with a new liquid yeast is make a 1.5L starter on a stirplate...

Oh cool you've got the LCDs right on the rPi's I2C I didn't see that. What is the bus speed of that I2C bus out of curiosity? I imagine it can go even higher than 400kHz given the Pi has a much higher clock speed than my ATmega does.

You may have already found this, but I know when I used an MCP23017 with the adafruit library I noticed that the I2C bus was only running at 100kHz and could be juiced to 400kHz with a compiler define. That was on the Arduino platform though so I don't know if it carries to the Teensy platform...