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Full Version: All-In-One Mini Q-Control Unit
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Here's version 1 of my MINI Q-Control Unit:  

Here's a quick run-down.  I'll have complete build info soon for people that want to try it out....

[Image: IMG_20161119_184017.jpg]

[Image: IMG_20161031_152942%20-%20Copy.jpg]

More photos here:

You'll see that it is using basic complete boards that you can get from anywhere:    What's included:

WeMos Esp8266   ($4)
atmega pro mini 3.3v 8mhz ($3)

for temperature control I'm using 2x MAX6675 ($3/each)

diode, mosfet for fan control and a connector for micro usb (5v power)

for the damper part there's just a simple cheap servo and 5v fan/blower....

I'll be testing this out once I get it connected to my Kamado.....works on my desk though Smile
from wBegg (from old board system):

This looks awesome, David.



I think a printed circuit board could clean this up even more. I'd like to draw something up and maybe get a few prototypes from OSH Park. Shouldn't be too much of a layout, as most of the board will be mainly connectors. 


MyResponse:

That would be super-awesome if you could design a board!!!

It could get really shrunk down...some quick thoughts:

the atmega pro mini might only needs 3 connections to the esp....depending on which esp8266 board we decide the mini could go underneath the WeMos board.  Do you think that might work?  The mini could be soldered directly to the board and use a small row of headers right next to it for the WeMos/NodeMCU board to attach to....  

more than 2 thermocouple(even 4?) board support?  I've ordered a few of these....it'll be a while, but they are the max31855 thermocouple and they seem smaller than the max6675s I've used.

we could leave some holes to support ADC connections....but then we'd have to worry more about 'noise' from the fan/servo.

a future idea would to leave some options for headers to attach to something like this ....if you notice the back it could just attach to the board to make a 'standard' type of controller (not attached to the damper)...maybe I'm getting too ahead of myself Smile  as usual!!!

I'd definitely like to get some made as well.... 


from wBegg (from old board system):

Some awesome ideas. 



I just ordered some pro minis, D1 Esp8266,and a couple of max6675 so I can get this set up. Seems I lost some things in the shuffle to get back to the States.


I'll play around with placement and layout once I receive.
OK, so I received my ESP, arduino, and MAX6675s. I noticed that the MAX6675 is pretty much just the chip and a capacitor, so it got me thinking. Why not design a board with the MAX chips integrated into it. This would allow for a much smaller footprint, and also allow for an OMEGA style connector for the thermocouples. 

Then I priced the chips on Mouser and Digikey, and was quite disappointed to find they are quite pricey. Almost $13 a chip. It would be much cheaper to re-purpose the chips from the chinese boards from places like e-bay and such. Just an option.

I'd like to start designing a board with both options maybe. 1 with plug-in style, and 1 with on-board option, or maybe these two options could be incorporated into the same board. 

Do you have a schematic of how all this gets hooked up? 

Cheers,
W
that was fast....I thought you were getting it from china via 'slow-boat'....

i just did a small graphic for you to see how I got it hookedup....  try it on the breadboard first....  let me know when you plan on trying it and I will send you some test files/instructions to get it working.

the graphic doesn't have fan control yet,  i'll put that in a separate pic....  the fan control mosfet is a tough choice as not many can drive many mA with a 3.3v logic.  the one I used IRL44N should work up to 400-500ma but I don't use a fan in the allinone so if you could test it out with other mosfets that would be great.  You can connect the fan to 5v (usb power) and use pin 3 on the promini to the mosfet for control.   Make sure you use a diode on the fan connection if you plan on trying the fan, and a small resistor to group for the mosfet..

Here's the photo[Image: allinone_sch.png]
I received my first parts today. The MAX6675 boards arrived a lot sooner than I thought they would. Hopefully, other things will start to show up soon.
I just noticed my micro usb board hasen't even shipped yet...not cool.
did you order from ali/ebay? I find that these days, ordering from china is about 90 days for Canada.

It arrives in Canada pretty quickly, but clearing customs takes forever.... but I'm patient Smile

You should start a new build thread for your build. Pictures of everything and progress... would help others who want to start out!
(02-16-2017, 03:36 PM)NailBuster Wrote: [ -> ]did you order from ali/ebay?  I find that these days, ordering from china is about 90 days for Canada.  

It arrives in Canada pretty quickly, but clearing customs takes forever....  but I'm patient Smile

You should start a new build thread for your build.  Pictures of everything and progress... would help others who want to start out!

So this is just bizzare. I got impatient and made another order from ebay for the micro usb connection board thinking that it would ship quicker. Less than an hour later I get a notification from Ali stating that the one I ordered from there had finally been shipped. I gotta wonder if they are all coming from the same source.
(12-17-2016, 11:23 AM)wbegg Wrote: [ -> ]OK, so I received my ESP, arduino, and MAX6675s. I noticed that the MAX6675 is pretty much just the chip and a capacitor, so it got me thinking. Why not design a board with the MAX chips integrated into it. This would allow for a much smaller footprint, and also allow for an OMEGA style connector for the thermocouples. 

Then I priced the chips on Mouser and Digikey, and was quite disappointed to find they are quite pricey. Almost $13 a chip. It would be much cheaper to re-purpose the chips from the chinese boards from places like e-bay and such. Just an option.

I'd like to start designing a board with both options maybe. 1 with plug-in style, and 1 with on-board option, or maybe these two options could be incorporated into the same board. 

Do you have a schematic of how all this gets hooked up? 

Cheers,
W
So why use the max6675 when the max31855 is an updated version and more readily available?  On Mouser the newer chip is ~$4.  

And +1 for Omega connector style

(12-14-2016, 05:28 PM)NailBuster Wrote: [ -> ][Image: IMG_20161119_184017.jpg]

I'm drooling  Cool
Yes, the max31855 is their latest chip...  I actually found a low cost breakout board and ordered it a while back.  It's sitting somewhere around here....and it's on my list to support.

the max6675 is really low-cost and cheap and has a great range....  the 31855 is more expensive but the difference is coming down.

Once I add support for the 31855 then it will be another option....

but the $4 chip on mouser i think is an SMD type....  that type of soldering is waaaay too complicated for me (and others)....  but its always good to have options if someone makes a circuit board to support SMD chips....that could be a support small board if we use 2-4 Max31855 smd chips...

the temp range of the max31855 is overkill for the food probes though Smile
Thanks NB for the insight, alot of this chip stuff is still new to me so I don't always understand all the ins & outs. Speaking of, why is it I keep seeing with various temp controllers a 4 probe limitation? I know that if the signal is digital, you can have up to 8 addressable devices on an RPi. What am I not understanding? If it is possible, and I realize that there may not be much demand, I'd like to explore an option for a second set of 4 probes.
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