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#1 4thisguy

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Posted 30 December 2013 - 11:33 PM

First post here and I'm hoping someone can point me in the right direction.  I'm looking to build a Sous Vide cooker for home use (if you don't know what that is, its a temperature controlled water bath used to cook vacuum sealed food).  Typically they are made with PID controllers, but (more as an experiment) I'd like to make one with my computer...write a little program (LabView or C++, or other suggestions?) to control a heater based on temperature input and manually entered set-point, with some data logging along the way.  I'm sure there are easier ways to do this, but this is a bit of an experiment before I try more complex projects (beer brewing, home automation, world domination, etc).

 

So the question; what are my best IO options on the cheap?  I'd need a little input (temperature probe - ideally ability to work with a TC or maybe off-the-shelf meet probe) and output to open and close a relay (in this case, probably solid state).  I'm working on a mac most of the time, but I also have windows 7 running if needed.  Any thoughts for LabJack or other products that fit these needs?  I really would like to keep this as low cost as possible.

 

Thanks,

Guy



#2 LabJack Support

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Posted 31 December 2013 - 04:09 PM

We do have a Sous Vide expert here, so are familiar with them.

 

The lowest cost option is a U3.  I suggest a U3-HV for flexibility.

 

You can control most solid-state relays directly with the U3:

 

http://labjack.com/s...s-guide/2.8.1.4

 

The easiest way to measure temperature is with a silicon sensor.  You can buy the raw sensor element and waterproof it yourself (plasti-dip?):

 

http://labjack.com/s...erature-sensors

 

A thermocouple is not too bad to use, but you need to amplify the signal for the U3.  That would require an LJTick-InAmp or your own simply op-amp circuit:

 

http://labjack.com/s...s/thermocouples

 

http://labjack.com/s...s-guide/2.6.3.5

 

FYI:  De Steeg brewery here in town uses a U3 with LM34CAZ based probes:

 

http://desteegbrewing.com/



#3 LabJack Support

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Posted 31 December 2013 - 04:11 PM

The U3 is supported on Mac.  I suggest C++ or Python for a U3 on Mac.

 

http://labjack.com/s...river-linux-mac




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