Anyone ever build an Arduino temperature controller? {GEEKS}

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?

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

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

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

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!

I did but it resides in my brewing system

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

http://www.bbq-brethren.com/forum/showthread.php?t=117534&highlight=controller

http://www.bbq-brethren.com/forum/showthread.php?t=129229&highlight=controller

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.

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

Not sure if this would be helpful.
http://hackaday.com/2012/03/12/testing-an-open-source-pid-controller-with-steak/

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
http://arduino.cc/playground/Code/PIDLibrary


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rabeb25 said:

I did but it resides in my brewing system

Click to expand...

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!
Thanks
-Kenny

Yes, I did.

I use temperature probes purchased from Maverick that they use on their ET-73 units. They had no porblem supplying the temperature curves for the probes.

I also use a simple 12v, 10 cfm fan that's probably too big as I've never seen it go over about 50% powered.

The software reads the temperature in the cooker (via the probes) and compares it against the set temperature. It then determines the percentage of the error between the two. It then will turn on the fan via the PWM output by that error percentage. As the error decreases, the fan slows down. That way there's almost no overshoot.

I used a FET to control the fan. The PWM output is connected to the gate. There's a 1K ohm resistor connected between the drain & +12v. There's a 100uF 25v cap between the source and ground. The fan connects across the cap with a connector.

The idea is that the PWM output turns the FET on & off based on the calculated error percentage. When the FET is on, the cap charges and powers the fan. The lower the duty cycle the lower the average voltage for the fan, hence it slows down. The cap will 'average' the PWM pulses to create sort of a variable DC for the fan.

Pretty simple really.

Photobucket seems to be having some issues at the moment. As soon as they fix it, I'll post some photos of it in use and some internals.

Russ

twinsfan: have you seen this thread? http://www.bbq-brethren.com/forum/showthread.php?t=77330

Seems like a nifty design, but it does not have a fan, so it differs from yours.

You can translate the +5 volt control voltage to +12 volts by using a transistor, FET, or some other type of switching.

Connect the +5v (suitably limited) to the Base (transistor), or Gate (FET) and put the +12v on the collector (transistor), or drain (FET), again suitably current limited.

Here's a really good place to start. Bob did a good job of explaining how his works.
http://hruska.us/tempmon/

Russ

New member here. Is there a more cost effective way to get the Arduino wireless than the Async WiShield ($55)?

I am not familiar with Arduino, but could learn enough to write a decent Web/Android/iPhone app to monitor temps.

Been looking for a new side project since graduation in May

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