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I am, if an Arduino with a PID-library is counted? Actually I've two PID's in a cascade. The serial is used to control and monitor temperatures + if needed changing the PID parameters.

Nearly there, a few things still hold in place by bubblegum, but it works reasonable well already. A big bummer was the fact that the magazine bended when I glued it together, it sometimes shoots two caps at the time because of that. http://youtu.be/ayErOyFyYTY http://youtu.be/zM_fHwKZBw8

I'll put the caps on a magazine, trying to get the dimensions right for the mechanism, it starts to be in the right ballpark:

Trying to make it feed the caps automatically: http://youtu.be/K9FQmfjGtBE http://youtu.be/pDDr1t1ElhQ

Here's my prototype in action: https://picasaweb.google.com/104045943760755128661/LievalanPanimo#5954648645400791346

I added a tab for mash settings + made the controls tab prettier. I've to learn how to use Arduinos EEPROM, it would be handy to put all the calibration values + PID stuff on the controls page too, after that I could change them on the fly and they would be saved on the memory.

I connected the cell's in a Wheatstone Bridge, it drifted about 60ml on overnight test run (1st brew with this mashtun/scale sometime during this week). The hoses that are connected to the mashtun didn't affect the results at all. The mashtun is made so that I can swap the direction of the...

Sorry about the missing videos, I deleted my youtube account... There's been a few updates with this project anyway and more to come too. The interface is now handled trough touchscreen + PC (the LCD + arduino's keyboard are still there for backup, but not for long, it's so much easier to...

The main reason behind all of this (there's a lot of info about this earlier in this thread, my previous setups with a constant pump speed and before that I had several HLT controlled systems) is to get an instant respond to the setpoint changes when doing step mashes. This can be done with a...

Seems to be working for them with rims: http://www.speidels-braumeister.de/

Yet another test run 50-65 deg C, maybe a bit too aggressive (some oscillation), but it might be just right once the grains are in: Once settled, it keeps the wort with in +- 0.1degC and the mash under +- 0.05degC :rockin: I guess this starts to be it or I have to get more accurate sensors ;)...

Yep, it seems to work now. I didn't have the patience to wait long enough to the HLT to heat up. The pump was just a tiny bit underpowered when heating from 50C to 65C and it didn't reach 65C straight away, but that will be cured by just g(l)etting the HLT to heat up to the 80C or just above...

Yeah, it does, oscillating like crazy. I just put in a 12V pump instead of the 24V. It looks like I hit the sweet spot now. I've PID back on again and the pump is running all the time, no oscillation (on/off). I need to wait to my HLT to hit 80 degC and I can see, if it works in all of the...

I couldn't make the PID work as I wanted, so I ditched it and I'm using my own code again. I also tried with even shorter HX, but step times suffered too much. Here's the latest test, I think I leave it like this for now (I'll just make it a tiny bit more aggressive on steps + different profiles...

Did some testing and reading last night and now a brew. The new 1 meter HX is still way too much. What I can guesstimate from my graphs is that about 10 centimeters is enough, if the length/efficiency-ratio is linear on HX's. I think I do a 30cm one and see how it goes. Now it's almost all...

Productive day, I made a new shorter HX: And I added a PID-library to my Arduino program, here's a test run with parameters from this example, I only changed the "gap"-parameter to 2 degC http://playground.arduino.cc//Code/PIDLibraryAdaptiveTuningsExample Now I just have to get into...

Here's a graph with the PWM numbers (green), it's the 65 -> 70degC step from a real mash, 5 gallon patch. Here's the mash temp only from the whole mash, measured from mash tun's output: Wort + mash: Pretty happy with it, but I think that I can make it a lot smoother with a smaller...

I haven't checked the frequency myself, but internet tells that it's 490Hz by default with Arduino Mega that I'm using. I've sketch that changes the pwm range when setpoint comes closer and it sounds quite nice, like a Lo-Hi tune from Kuusumu :fro: It also sounds like the motor is not liking it...

I'll take a graph of the PWM next time that I have time to test the system. The problem with a faster recirculating, if it's "gravity fed", is that it's really easy to end up with a stuck mash. That's why I've been thinking about the reverse flow and maybe switch to gravity fed after the mash...

The pump is a cheap 24VDC, the ones you can get from several Ebay sellers. I did some more testing and I think that my CFHX- is a bit too powerful, it would be much easier to control the pumping power near the setpoint, if it would take a bit more pumping of the hot water than what it takes now...