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The heater coils behave pretty linearly around there, which is just fine for PID.

Nice build, yayvape. Looks like fiddling with the I, D terms can get you better stability around the setpoint. Have you tried Ziegler-Nichols for tweaking the PID? Yours looks pretty decent already, but its something you might consider trying. Should be pretty straightforward, compared to...

To drive the MOSFET, I'd take a look at something like the MCP1416 IC from Microchip. It can provide a lot more current than the output of a uC can. The gate capacitance of the MOSFET can reach 1000s of pF during high current switching and the 20mA or so output a uC is capable of will take a...

Ah, I didn't catch the supply voltage. You could always keep the uC at 5V, though, and level-shift the SPI signals between the uC and the MAX31855. Then again, minimizing the number of components is always good, so having all the peripherals use 5V is convenient. This app note on level...

Statistical mechanics says this is absolutely true. However, at such low temperatures, the probability of single THC molecules acquiring enough energy to leave their neighbors and become airborne is exceedingly low.

The MAX6675 is $14 at digikey and mouser!? Thats quite expensive for an 8 pin chip:(. Additionally its successor, the MAX31855 is out of stock everywhere... grumble.

Sweet, thanks for clearing that up. I just like knowing how things work ^_^. Interesting choice of copper. It has such a low resistivity!

You're probably right here. By ceramic, he probably meant, "ceramic in the airpath" and was comparing having those materials present in the airpath vs not having them present.

I read that post. A "proprietary heater that can shape around our glass" is very nonspecific. The only time stonemonkey55 used the word "ceramic" in one of his posts in this thread was when he was differentiating the Cloud from other vaporizers eg: post 1183 see google...

Thanks. To be fair, the type of heater used in the Cloud was never stated in this thread. Look for yourself google: site:fuckcombustion.com vapexhalelabs ceramic heater Here's the quote from vaporpedia for those who are interested: "The Cloud Heat Injector uses a unique heater design that...

Hey, the Cloud looks quite impressive. It's evident that a lot of work went into it. I had a few questions that I didn't see the answers to in this thread / your site that I was wondering about. Where is the temperature sensor located? I think I remember you mentioning that you used a...

Good to know, thanks.

I sincerely hope this is an early unit that dime is showing. There are some serious fit and finish issues that shouldn't be in a $450 vaporizer.

Hey, which IR emitter are you using in The Oracle?

I'm quite excited about putting my knowledge of embedded electronics to good use :). I'm a C, AVR guy (paying for compilers sucks) and tend to stay away from assembly unless absolutely necessary, so I commend your ability to implement PID control in PIC assembly with that damn W register!

Haha, well open source engineering without me having to reverse engineer it ;)

Cool, thanks for the reply. I like your simple/efficient design a lot. Open source engineering for the win! Do you think you'll ever need to opto-isolate the MOSFET switching circuitry from the digital control ICs? Those must be pretty large switching currents. If you haven't observed any...

Hey what kind of current are you getting through the MOSFET? How hot is it getting? Have you considered using a large ground pour on both sides of the PCB with plenty of thermal vias?