Jump to content

As of July 17, 2015, the LabJack forums here at forums.labjack.com are shut down. New registrations, topics, and replies are disabled. All forums are in a read-only state for archive purposes.

Please visit our current forums at labjack.com/forums to view and make new posts. To post on the current forums, use your labjack.com login account. Your old LabJack forums login credentials have been retired. There are no longer separate logins for labjack.com and LabJack forums.


Help getting started

  • Please log in to reply
2 replies to this topic

#1 4thisguy

  • Members
  • 1 posts

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.




#2 LabJack Support

LabJack Support
  • Admin
  • 8677 posts

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:




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




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:






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



#3 LabJack Support

LabJack Support
  • Admin
  • 8677 posts

Posted 31 December 2013 - 04:11 PM

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



0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users