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Yup. I've got a dutch oven that's been through tons (not joking, tons) of wheelweights. I'm not aware of ANY process that would make it food safe again. That said, it I wanted to reclaim a thrift store skillet that I had no reason to question the history of, I'd put it on the turkey...

So this is pretty much a gas-system-only problem, I'm guessing?

Which does what? You mean it actually, uhm.. virtually... breadboards whatever you draw? You can adjust pots and watch the voltage divide and such? The freeware version limits to 2, yes. Yup, what little I know, I learned from Sparkfun, LadyAda, and Jeremy Blum tutorials. I think...

Where are you with this? Have you got anything to show yet? What do Orcad & Allegro that Eagle doesn't? I'm aware of the freeware version of Eagle's obvious limitations of 2 layers and maximum size. But the sum of my experience is pretty much wrapped up in this thread, plus a number...

Oh, and for testing, I couldn't figure out a way to simulate, so I built a low-power model to play with. I clamped a peltier junction between an ancient CPU waterblock and a chunk of aluminum heatsink, using the arduino to drive a MOSFET. It's crude, but worked to prove the code and everything...

The Arduino's analogWrite(ssrPin,XXX); for PWM is not useful for our purpose. Most of us are using zero-crossing SSR's, which only happens 120 times a second. Yes, use the relay example from the Arduino site, it works great once you have acceptable values for P, I & D. That is the part that...

I can email them to you, PM your email address. That's a bit beyond the scope of a single thread. To get started, I suggest you pick up an Arduino UNO and download the Arduino IDE, here. ArduinoISP is the sketch you're interested in. It's one of the example sketches that come with the...

This is a shield I made to use the UNO as a programmer. I can put 8/168/328's in one of the ZIF sockets. The other is setup to program attiny84's at one end, attiny85's at the other, and I have a six pin header one there as well. I sent the Gerber files (made w/ Eagle) to BatchPCB for that...

I've recently started this part of the hobby. The route I've taken is to learn Eagle. It's not intuitive, but it's powerful. Plus, the reference files on the Arduino site are in Eagle. For my shield, I downloaded the UNO reference file and deleted everything except the outline, the stackable...

So, this is the curve you want? So that 65% of the control covers to 50% output, then ramps up to 100%?

Y'know, you just gave me another idea for the next iteration. I could add a two position DIP switch, and put four different profiles on chip.

Correct, as long as you have a 7-12vdc power supply. An LED driver from eBay would do, or any wall wort since there's a vreg already on the PWM.

Sure. It will look a little weird, as I'll have to use an extended set for the connector to clear the potentiometer housing. It will function fine, though. I'm going to do a revised version, I think. I want to rotate that header 90° to fix that issue. I also want to shed that mechanical relay...

Thanks! The electromagnets are these. They are driven with an SN754410 h-bridge, which is controlled by an ATtiny84. It's not very stable, the magnet will only spin at a specific RPM. But, hey, this is just a start. I'm receptive to any ideas anyone has to improve it.

I've been trying to come up with SOME advantage this idea would have over a magnet glued to a fan. I haven't been successful. That said, I'm going to try it anyways. Here's a rough prototype.

I'll have to do that for you before I send it. I temporarily solder a six pin header into the corner and hook up a programmer as I'm assembling it. Where would you want the center of your 'fine control' band to be?

Sure it would. But if that's your plan, you can leave out all but just a few components.

I'll barter one instead? Click on my name and do the "donate" thing for a membership for me, and I'll send you one. That way, the board here actually gets the money. Sound fair? Wait until I get another one put together, though. I've got some family here with health issues. If you do send...

Mine: https://www.homebrewtalk.com/f51/chuckjaxfls-pwm-344952/#post4296437

The PWM can run on 7-12vdc. The PID is wired into the PWM, rather than the SSR. When the switch is in the "off" position, the PID controls the SSR. Once turned "on", the PWM takes over control of the signal. The schematic & board were drawn in Cadsoft Eagle (freeware version). I used...