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twinsfan 07-11-2012 01:30 PM

Anyone ever build an Arduino temperature controller? {GEEKS}
Hey guys,

I was wondering if any of you guys have ever built an Arduino, or any microcontroller, powered temperature controller.

I've always been a fan of Arduinos because of the ease of programming and relatively simple programming language, but never bought one. The Arduino Uno, pictured below, went on sale for $19 and I had to pick one up. Coming in the mail this afternoon.

Also, I ordered a 40 mm Scythe fan, for $4, which is powered by 12 V, not 5 V which is what the Arduino supplies. Not sure if it's gonna run too well, maybe an electrical engineer out there can help me out, the fan draws 0.06 amps, the Arduino powered by USB will supply 0.5 amps. I'm hoping it just runs at reduced speed.

Also have three thermistors, to measure temperature, and five 10k ohm resistors in the mail. Will build a simple circuit with some LEDs and a peizo to alert me when the temperature drops below set temp.

Sorry for techy post. Has anyone ever built their own iQue like set-up and how did it go?


Sorry for the techy post,

caliking 07-11-2012 01:42 PM

Cool! I would be interested in a similar project, but don't understand the electronics to figure it all out for myself.

Can you share where you bought your materials from?

touchdowntodd 07-11-2012 01:51 PM

hmm ... i could get into this .. keep the info comin

NVehr13 07-11-2012 01:54 PM

This actually crossed my mind the other day on the way home from work. But i wanted to use a Raspberry Pi, Two temps, (one monitors meat temp, one monitors grill temp) and the one that controls the power for the fan.

I didnt see any reason it wouldnt be feasible, may take some doing and may have to write some software for it. but keep us posted, i may get mine underway in the winter when i actually have time to do it

twinsfan 07-11-2012 01:56 PM

Alright, for those asking for information about this project, I bought the Arduino from The advantage of them is they have all the chips built into it with a standard USB connection, while if I tried to save money and buy a $1.00 micro-controller, I'd have to use serial and proprietary connectors which would be a huge PIA.

The first problem I've run into is the thermistor's I will be using max out at roughly 260 F. That's not a problem, because I'm looking to monitor when the temp drops, which will be somewhere between 210-225 F as the cut off.

I will be posting pics as I will be going. Instead of spending $150 for an iQue, I can build a similar unit for $35.

I will update with pics as I build the circuit and write the code. I'm a-OK as a programmer, not as strong as an electrician. We'll see

Corky 07-11-2012 01:56 PM

I think someone on the Virtual Weber Bullet made something like this. Check there.

twinsfan 07-11-2012 02:12 PM

Thanks, I have read a few threads on the topic over there. Should be a good, relatively quick build.

caliking 07-11-2012 06:49 PM

I have longed for a DIY wireless thermo - I already have an et-7 and et-73 which work great for me, but i would love to be able to interface it with my Android phone. I know the iGrill exists, but I don't own any Apple products and plan to keep it that way. As you develop this project idea, think of an Android "app" please!

twinsfan 07-11-2012 07:24 PM

CaliKing, once this build is done, I will explore producing the product for Brethren as an affordable temperature control. I am an iPhone user but I feel you on the Android issue. Let me work on it and see if I could develop an app for the platform.

rabeb25 07-11-2012 07:29 PM

I did but it resides in my brewing system ;)

Pyle's BBQ 07-11-2012 08:40 PM

Not sure if this will help but here are a couple threads.

muidaq 07-11-2012 09:01 PM

For a wireless/connected solution, I'd be inclined to think a Raspberry Pi rig would come in cheaper. Arduinos get rather expensive once you add comm shields.

Can't wait for the outcome of this, though. I started down this path a while back and got as far as figuring out how to use a Maverick probe instead of the little thermistor. Then I discovered Auber and wussed out.

dcoyle4040 07-11-2012 09:45 PM

I'm a newbe but wont that fan melt? Or does it sit far enough away from the coals to be safe. Sorry for the newbe questions

shibby30 07-11-2012 09:48 PM

Not sure if this would be helpful.

Instead of relays controlling hot plates the relays could control a fan.

Sous vide is just low and slow cooking using a water bath.

Arduino PID code

Sent from my SCH-I535 using Tapatalk 2

kennyd0118 07-11-2012 10:36 PM


Originally Posted by rabeb25 (Post 2131443)
I did but it resides in my brewing system ;)

This is what I'm looking to build. I'd love some info on what you did. I'm an embedded system programmer so that part is easy. I'm more curious about the brew system. I'm still doing all-grain in the driveway but would love to move indoors. Beautiful pot you have there!

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