» MAKE: NOISE — Discuss this article

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• Wire for probe?
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  I'm looking at specs for wire, and seeing most has a temperature limit at 90C, when I can find a specification. This concerns me with making this project, as the 185F = 85C only 5 degrees from the limit of the wire. The point the wire contacts the cooker would be hotter, possibly quite a bit hotter. It looks like you used a long piece of heat shrink over it, but that might not be enough.
  I'm just wondering if there's a particular wire source that's good to use in this kind of application that I'm not finding. I already have obtained the rest of the parts and put together the relay board. All I need to build the sensor probe and wire things together and I can test it.

  Posted by kevinreaS on August 11, 2011 at 23:52:57 Pacific Time

• Error in the code?
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  I built this project this weekend. Worked ok in the end, but I noticed that there was a disconnect between the schematic/fritzing diagram and the code.
  
  The code calls for the pushbutton to be attached to pin 12 of the Arduino... but the schematic doesn't show this.
  
  Didn't matter to me much as I was making modifications anyway to remove the computer serial monitor stuff, but if someone were to follow this code/schematic verbatim, I think they would have issues.
  
  The basic concept works great, though. I've got rev 1.0 on the counter right now incubating my first batch. Rev 1.5 will have a serial LCD attached, once I figure out how to integrate it properly.
  
  I'm not a huge yogurt fan, but I am a foodie, and always enjoy understanding a process. I hope to apply what I learn here to an upcoming project - a blower motor for a smoker BBQ - this summer.
  
  Anyway, thought I'd point out the error in what was otherwise a fun and interesting project.
  
  Thanks!

  Posted by PerryRT on February 13, 2011 at 15:18:43 Pacific Time

• Error in the code?
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  Perry, part of the challenge of building the schematic was using pre-designed kits (the Arduino shield and the Sparkfun relay board). The shield kit has the button built into pin 12, if I remember correctly, so if you're not using the shield you may need to change your pin settings in the code.
  
  Anyways, thanks for your feedback. I'd love to hear if you find other uses besides yogurt making!
  
  -Chris

  Posted by diylilcnc.org on February 13, 2011 at 20:12:46 Pacific Time

• Re: Error in the code?
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  Chris -
  
  Ahhh... OK! I didn't have a protoshield available, but I always have plenty of perfboard sitting around. The key to hacking is using what you got, I suppose.
  
  The first batch turned out great, actually - I had some with blueberries yesterday and am marinating some chicken breasts for tandoori this evening.
  
  As far as other food related applications go, really, I would think this sort of idea would be handy anywhere you needed a specific temperature over time. I have lots of cheese recipes that call for "X minutes at Y degrees F" or "ramp the temperature to X degrees F at a rate of no more than 2 degrees a minute" - that sort of thing.
  
  Also, how about adapting this to make a refrigerator controller for lagering beer or storing wine or cheese? I would have to do some math on that to ensure that the relay could handle the inrush current of a fridge compressor, but the basic concept is sound.
  
  Anyway, thanks again for the writeup.
  

  Posted by PerryRT on February 15, 2011 at 17:12:41 Pacific Time

• Code Link?
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  Posted by johne@jellenberger.org on January 27, 2011 at 18:06:17 Pacific Time

• Code Link?
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  I see the link to the drawing but I don't see a link to the code.

  Posted by johne@jellenberger.org on January 27, 2011 at 18:07:10 Pacific Time

• Code Link?
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  Hmm ... I'm seeing the code right above the drawing link. Are you seeing the word "Code"?

  Posted by Laura Cochrane on January 28, 2011 at 09:20:46 Pacific Time

• Code Link?
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  Got it. Thanks.

  Posted by johne@jellenberger.org on January 29, 2011 at 10:08:36 Pacific Time