TeensyPi Networked Temperature Controller - Page 36 - Home Brew Forums
Home Brew Forums > Home Brewing Beer > DIY Projects > Fermenters > TeensyPi Networked Temperature Controller

Reply
 
Thread Tools
Old 06-29-2013, 05:14 PM   #351
jimmayhugh
Turgid Member
HBT_LIFETIMESUPPORTER.png
 
jimmayhugh's Avatar
Recipes 
 
Feb 2011
Las Vegas, NV
Posts: 767
Liked 107 Times on 81 Posts


I've decided to incorporate both thermocouple sensors, and have boards and software in the works. Stay tuned...


__________________
TeensyNet Networked Controller
ButtCrack Brewery
And This Is Why We Drink...
Cogito, ergo bibere cervisia sum

 
Reply With Quote
Old 07-13-2013, 01:30 AM   #352
jimmayhugh
Turgid Member
HBT_LIFETIMESUPPORTER.png
 
jimmayhugh's Avatar
Recipes 
 
Feb 2011
Las Vegas, NV
Posts: 767
Liked 107 Times on 81 Posts


I've received the boards for the thermocouple sensor / switch combo board, and have put together three units for testing.

So far, it seems that the DS2762 may be suitable as a thermocouple sensor on a 1-wire mini-lan with a few caveats:
  1. The choice of a thermocouple seems to make a difference. I've got 3 thermocouples from different sources, and the locally sourced thermocouples seem to be more reliable. One "stainless" model that I sourced from china on eBay has already developed a fine reddish patina after a day in my local water.
  2. Since we are dealing with measuring microvolt levels, induced noise is a problem. My first generation boards seem to fluctuate more than I like, so I'm doing a second generation thermocouple-only board that will include a substantial ground plane for shielding. More on that in a later post.
  3. My current software only measures down to 0 degrees C (32 degrees F). This may change in a later iteration. The values are also displayed in full degrees to conserve space.
  4. The DS2762 is only available as an SOIC-16 Surface Mount Device (SMD), so more care and better soldering equipment is necessary if assembling the board yourself. There are numerous excellent videos and webpages that outline the techniques and skills required, so I'll not repeat that here.

When I'm satisfied with the design, I'll release the Eagle files and updated software.

More as things develop.


__________________
TeensyNet Networked Controller
ButtCrack Brewery
And This Is Why We Drink...
Cogito, ergo bibere cervisia sum

 
Reply With Quote
Old 07-13-2013, 10:51 PM   #353
jimmayhugh
Turgid Member
HBT_LIFETIMESUPPORTER.png
 
jimmayhugh's Avatar
Recipes 
 
Feb 2011
Las Vegas, NV
Posts: 767
Liked 107 Times on 81 Posts


Maxim just announced the MAX31850 1-wire thermocouple converter. More on this after I get some samples.

UPDATE: There's currently a 17-week lead time on purchases from distributors, so it may be a while before this becomes a valid option.
__________________
TeensyNet Networked Controller
ButtCrack Brewery
And This Is Why We Drink...
Cogito, ergo bibere cervisia sum

 
Reply With Quote
Old 07-14-2013, 04:01 PM   #354
RickH
Recipes 
 
Jun 2013
Princeton, Texas
Posts: 65
Liked 5 Times on 5 Posts


I am loving this. Being a HUGE fan of the various Pi projects this is especially amazing.

 
Reply With Quote
Old 07-17-2013, 04:46 AM   #355
jsbird
HBT_SUPPORTER.png
Recipes 
 
Oct 2012
Posts: 61


Quote:
Originally Posted by jimmayhugh View Post
Maxim just announced the MAX31850 1-wire thermocouple converter. More on this after I get some samples.

UPDATE: There's currently a 17-week lead time on purchases from distributors, so it may be a while before this becomes a valid option.
Just what the doctor ordered; sounds like it will be worth the wait!

 
Reply With Quote
Old 07-21-2013, 02:45 PM   #356
jimmayhugh
Turgid Member
HBT_LIFETIMESUPPORTER.png
 
jimmayhugh's Avatar
Recipes 
 
Feb 2011
Las Vegas, NV
Posts: 767
Liked 107 Times on 81 Posts


Just found some code here that should allow you to place almost anything that you can control on a Teensy 3.0 on the 1-wire lan.

Playing with the code as we speak...
__________________
TeensyNet Networked Controller
ButtCrack Brewery
And This Is Why We Drink...
Cogito, ergo bibere cervisia sum

MaverickBrew Likes This 
Reply With Quote
Old 07-23-2013, 07:04 PM   #357
mbrdk
Recipes 
 
Mar 2010
Copenhagen
Posts: 2

Jim great work! I just got mine up and running and was wondering if there is a easy way to change the temp to be displayed in Celsius?

 
Reply With Quote
Old 07-23-2013, 11:23 PM   #358
jimmayhugh
Turgid Member
HBT_LIFETIMESUPPORTER.png
 
jimmayhugh's Avatar
Recipes 
 
Feb 2011
Las Vegas, NV
Posts: 767
Liked 107 Times on 81 Posts


Quote:
Originally Posted by mbrdk View Post
Jim great work! I just got mine up and running and was wondering if there is a easy way to change the temp to be displayed in Celsius?
There's a boolean value "showCelcius" ( yeah, I know, spelling ) that can be set to "TRUE" , and then re-compile the Teensy 3.0 code, and the temp values should be set to Celsius.

I can also add code that would allow the values to be changed by the GUI, but that would be in a later release.
__________________
TeensyNet Networked Controller
ButtCrack Brewery
And This Is Why We Drink...
Cogito, ergo bibere cervisia sum

 
Reply With Quote
Old 07-24-2013, 03:41 PM   #359
lcat45
Recipes 
 
Apr 2012
, tn
Posts: 94
Liked 2 Times on 2 Posts


Hey Jim...been following this since day 1 and really like what's been going on so please don't take this next statement the wrong way....I'm a bit lost as to why or what you're looking for in the pursuit of new boards, hardware, and or ways to get to the end of this project if there is one....so please bring me up to date as I'm curious as to where it's going....will follow you to the end if my time and resources can hold out....again just an awesome project and one that I hope to finish...sincere regards

 
Reply With Quote
Old 07-24-2013, 07:49 PM   #360
mbrdk
Recipes 
 
Mar 2010
Copenhagen
Posts: 2

Thanks Jim it worked, a possibility to change it via the GUI would be nice to have even though changing the Teensy 3.0 code, recompiling and uploading took less than a minute :-)

Any plans for RTD (PT100) sensor support in the near future?



 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Arduino - Networked Temperature Monitor jimmayhugh Kegerators & Keezers 81 01-27-2013 01:22 AM
Temperature Controller sy2088 Equipment/Sanitation 3 10-25-2012 06:28 PM
Lux Temperature Controller scoots Fermenters 9 07-06-2012 01:38 PM
temperature controller from deas fridge - use as external controller on live fridge? BrewingChemist Fermenters 1 05-22-2012 10:21 PM
Johnson Analog Temperature Controller Temperature Profile Coastarine Equipment/Sanitation 4 10-11-2010 03:58 PM


Forum Jump