SmokerDuino V2

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Introduction: SmokerDuino V2

About: Disclaimer: The author is not responsible for loss of life, limb or property. The author is not responsible for your actions. The author is not responsible for anything. In fact, the author is completely i...

They say "low & slow is the way to go".

I had built a simple Smoker controller in a previous instructable. For V2 it's time to go big.

I had posted a Wifi Meat Thermometer here before. I figured why not combine that with the smoker controller.

I got this car diagnostic meter at a swapmeet and decided to make it into a new Monster Smoker Controller.

Step 1: Gut It!

My favorite part of most projects is taking it apart. I save any scraps that wont be reused this time.

Who knows what they may get used for later.

i use these little divided drawer organizers to keeps the screws separate.

Also helps to have a cookie sheet on you table to work on top of. It catches the screws that fall.

I actually use an old cargo tray from a car.

Step 2: The Meters

I bought this cool software from Tonne Software that lets you make Meter Faces. They have a free version that only does one scale.

One of the meters had a few stress cracks in the case but they both worked great. A little cement melted those cracks shut.

After you design your meters just paint the old faces or flip them over so you have a blank slate.

I use 3M Sprayment but any contact cement should work. Just be sure your face plate is clean....

Step 3: Power Relay

My smoker draws 12 Amps so I went for some large parts here. I used a 240V 45Amp solid state relay mounted to the bottom of the case. I ground a section on the aluminum case flat and used some heatsink grease for good measure.

I used a simplex AC outlet and a recessed plug with some 12Ga wire leads.

The hole saw I use is a little large for the outlet so I 3D printed a ring to take up the extra space...

Step 4: Connectors and Switches

At first I thought I would put the connectors on the front but then I realized I had some nice round switches that would fit there. I drilled a few extra holes and put switches from one side to the other.

A Unitbit makes short work of this but does drift a bit if you're not careful.

For the thermocouple I used some binding posts and for the meat probes I use these locking connectors.

I found a new slide switch to fit the existing hole in the front panel. I cut LCD slots that covered up hte remaining holes. I 3D printed some nice bezels for these.

I only added one pilot light but its an RGB led..

Step 5: Assembling It

Everything went together pretty easily. I used the same code as in the previous instructables. (see links in intro). I just added a pwn output to drive the meters. i scaled them so 97% pwm pins the needle to the end. I like to know when things go wrong....

Only difference is I didn't use a Linkit. I opted for a another atmega 328. Now I will probably go back and add the wifi. It really was nice to have. Or maybe I'll start on V3...

Step 6: The Best Part, Testing It!

Brisket and Ribs.

Nothing more to say......

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    4 Comments

    Cool! care to share some more information about the smoker itself? Did you make one or is it a commercial product? Thanks!

    1 reply

    If you check out the first version, link in intro above, you'll see a slightly modified Smone hollow smoker

    I got it for $50 at a yard sale. It got s quick pressure washing and wire brushing. Then a hot bake at 350 to dry it out.

    I used little jack Daniels flavored chips at first but found the best stuff was big chunks about 3x3x3 inches. I found big applewood chunk at lowed right next to the lump charcoal bags.

    This way you don't even have to soak them in water first. Just put 4 chunks on the grill directly about the heating element. I use a separate tray filled with a mix of 2/3 apple juice to 1/3 Jim beam or jack Daniels.

    Don't try that on a charcoal fired smoker it might flash over.

    Everything I read about smoke hollow smokers said air flow was an issue. A $3 damper from true value and an exhaust pipe can fix that.

    I haven't tried it yet on my baby charcoal smoker but this controller should work for coal if you let it control a small fan to stoke the coals for you.

    Thanks! I just bought a single meter version last week for $5 just because I love the old school look