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Some pics

I finally put together a PWM. A friend wanted a PWM to use alongside the PID already installed in his awesome BIAB system. He's more than capable of building his own, but I told him I wanted to throw one together for him. He didn't want a DPDT between the PID & the PWM. I forget now why...

Very nice. The "everything fits in the kettle" aspect just floors me. That's awesome.

You want to avoid a regulator, but I think this might interest you: http://www.octopustap.com/cart/product_info.php?cPath=31_26&products_id=55

I'll wholeheartedly second the recommendation for the Jeremy Blum videos. I followed along, pausing and rewinding and going step by step. He covers a lot a material very quickly, and effectively.

This project was going pretty well, until this weekend. I'm having a bear of a time with the autotune library for Arduino. At this point, I'm receptive to any tips you guys have.

No... I'm close to giving up the faith on the autotune. I'm really frustrated with it. The only idea I have right now is to drag my the Arduino IDE, my sketches, etc, and everything over to my windows laptop so I can drag my laptop out to the garage. I'll have to tolerate using Windows, but...

It's official... I'm no help. The autotune library continues to give me values similar to the above for P.. and zeros for I & D. I spent some time last night reading about PID loop tuning. I'm going to post in the DIY section and see if I can get some help.

Okay, this went over like a fart in church. I guess the numbers will work, eventually! I have hard time accepting that my PID should just be a P with no ID. I'd try it, throw some more cold water in and see, but something just quit working in the can, so I'll have to fix that first...

Hopefully, I'll have better answers for you guys today. I'm working on it today. The part that is pertinent to this thread is that I changed the Serial.print parts to work on the LCD (no biggie), and I changed a couple lines in the working code. Specifically, I changed the aTuneStep to 200...

Made a lot of progress. I trying to auto tune this keg today.

I love the open pitcher of water, sitting on the PSU! I built a a crude peltier setup with an OLD DangerDen waterblock to start learning the Arduino PID library. It had a rough time cooling the gallon or so of water I was using. My peltier is a small, CPU sized one, though. Can you tell...

Uhm.... because I haven't thought it through that far yet? That would make a lot more sense, though. This part doesn't make sense to me. In my example, if the MLT and the HLT need to be "On" for the same time, my MLT would "steal" the signal from the HLT, the HLT temp would drop, and the...

Toner transferred, and the etched board. Thanks to those of you who recommended the Sharpie to clean up the transfer. It works WELL. For the curious, I switched to Eagle light to draw. I was using ExpressPCB, but have learned that the files are proprietary to their service. Eagle was NOT...

Here it is now. You can see that the Arduino is gone. The 'big' chip there was pulled from it. There's less than $10 worth of parts there. Once you add the LCD, the value vs a PID drops. However, I have PLENTY of pins left. I already drew another board that adds $0.40 worth of logic chips...

Here's the rat's nest on the breadboards. It's not as complicated as it looks. You can see the LCD, as well. In PID mode, it shows the Sv, Pv and current output %. In manual mode, shows --- for Sv, and in ON/OFF mode, it shows --- for output %.

I am abandoning the DIY PWM project. A few weeks ago I bought an Arduino UNO, and have really taken to it. The PWM seems like very, very low hanging fruit now. I though the Arduino was a specific type of microcontroller, or chip, or board. I just knew that it was over my head. What I now...

Any luck yet?

It was marinated when I bought it.

I hope it's helpful! I'm not a programmer, so if it looks butchered it's because I'm pretty new to Aruidino. Like I said in another post, the last thing I wrote was in "Clipper" for dBase III.