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Old 09-25-2012, 05:21 AM   #221
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I promised pictures but there isn't a whole lot of physical items to show just yet.

A significant amount of progress has been made on both the microcontroller and LabVIEW code:

  • Any number of DS18B20 sensors can be read, there are 8 1-wire channels which could each support a maximum 255 sensors... don't think I will run out of capacity soon. Currently I have four wired in for testing. Each sensor is polled once a second and the results are sent to the LabVIEW controller for handling/display.
  • All of the switches and manual dials on the front panel are read into the microcontroller and then a status message is sent to LV.
  • PWM outputs for the HLT, HEX, and BK SSRs are functioning properly.
  • Serial comms and error handling between the micro and labview works well.

The control panel is completely wired for my initial uses, everything checks out great so far. The power panel is nearly finished, just need to wire up a few neon 240V indicators for each element output.
  • The safe-start feature works perfectly! The 240V contactor in the power control module can only be enabled when all element/pump switches are set to off and the emergency stop button is released. Once started it is only disabled by turning off the control panel or hitting the e-stop.
  • The front panel alarm physically works, just need to determine where in the process to use it.
  • All connections between the control panel and the power panel are working correctly.

The RO/DI system plumbing is 95% complete, the 4 remaining fittings should arrive by Wednesday. A couple extra parts needed for the solenoid valve control should also come this week.

I ordered some ingredients for a couple extract brews and a partial mash to get me started on this new control panel. From there I will move into AG once my pumps and the remainder of the system is completed. Hopefully I will be producing beer again by next week, I haven't brewed for almost a year now .
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"No sense having empty carboys around when full ones take up just as much space. " - Me
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Old 09-26-2012, 04:30 PM   #222
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Nice job! I just read thru the hole thread and have to say I like the concept. Have you thaught of using a plc to control this masterpiece or are you happy with your processor interface? I know labview interfaces with plc's nicely. I've done it before an am working on my own automated rig using an allen bradley and labview.

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Old 09-27-2012, 10:43 PM   #223
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Hey had a question about your digital temp sensors..

i bought the same ones, and im looking to hook them up to a NI myDAQ (http://www.studica.com/ca/en/Nationa...781327-01.html) and using its digital in's
and finally using labview to provide an analog input for an SSR.

Im treading new ground with this. Not an electrical guy, this is for a mechatronics class. Do you see any pitfalls? Should i go analog with the sensors? (thermistors). I beleive I would need a wheatstone bridge to then convert the resistance to voltage.

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Old 09-28-2012, 05:20 AM   #224
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Quote:
Originally Posted by allclene View Post
Have you thaught of using a plc to control this masterpiece or are you happy with your processor interface? I know labview interfaces with plc's nicely. .
The originally concept for this was to be entirely controlled by a microcontroller, then came the feature creep. I think PLC(s) would be a fine replacement but they wouldn't give me the exact flexibility I have with the mcu approach. Much of the reasoning behind building all of this custom equipment was to learn how to build it, that is a big part of the fun of this hobby for me.


Quote:
Originally Posted by aquenne View Post
Hey had a question about your digital temp sensors..

i bought the same ones, and im looking to hook them up to a NI myDAQ (http://www.studica.com/ca/en/Nationa...781327-01.html) and using its digital in's
and finally using labview to provide an analog input for an SSR.

Im treading new ground with this. Not an electrical guy, this is for a mechatronics class. Do you see any pitfalls? Should i go analog with the sensors? (thermistors). I beleive I would need a wheatstone bridge to then convert the resistance to voltage.
Without knowing anything about that NI myDAQ I will offer a couple words of caution. The 1-wire protocol used for the DS12B20's requires microsecond resolution timing to implement in software, this may be difficult using LV and that DAQ. On my first iteration I performed all of the 1-wire routines by bit-banging in SW and it used way too many processor cycles. My design now uses a DS2482-800 I2C to 1-Wire bridge which has greatly simplified the code and eased the burden of the processor. You may want to look into a standalone 1-wire converter or use a different sensor for your project... There are several sensors that output a voltage reference relative to the temperature, the DAQ should read that just fine, no wheatstone bridge required.


As far as a project update goes, I finished up the water supply lines and drains last night. The only thing left for the plumbing is to finish the solenoid valve wiring.

Tonight I soldered the DC relays for the solenoid valve controls onto the embedded processor board. I also wrote some test code to cycle them off and on. I just need to wire up connects to the external outputs and implement the controls in LabVIEW. Might be ready to perform a plumbing test by Sunday.
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Primaries: Air
Secondaries: Lakefront India Brown Ale

On Tap 1: Rootbeer, On Tap 2: NB White ouse Honey Ale, On Tap 3: Nitrogen, On Tap 4: Air, On Tap 5: Air
On Deck: DIPA, Imp Stout, Porter, Wheat, Black IPA

"No sense having empty carboys around when full ones take up just as much space. " - Me
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Old 09-28-2012, 06:05 AM   #225
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Quote:
Originally Posted by aquenne View Post
Hey had a question about your digital temp sensors..

i bought the same ones, and im looking to hook them up to a NI myDAQ (http://www.studica.com/ca/en/Nationa...781327-01.html) and using its digital in's
and finally using labview to provide an analog input for an SSR.

Im treading new ground with this. Not an electrical guy, this is for a mechatronics class. Do you see any pitfalls? Should i go analog with the sensors? (thermistors). I beleive I would need a wheatstone bridge to then convert the resistance to voltage.
your daq should work just fine for this type of application. However, you might want to check to see if your daq will accept a 2 wire thermocouple directly to the daq analog input (I don't know what daq you have). if it has that capability, labview will see this fast enough and be pretty accurate. i have done this at work before and it works good enough for acceptance testing.
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Old 09-28-2012, 06:06 AM   #226
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coudles FB on your logic for using the mc instead of a plc. You gotta love a good challenge!

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Old 10-04-2012, 02:45 AM   #227
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Extremely impressive! Your LabVIEW synoptic display is beautiful; I hope to build one of my own some day. I look forward to your continued updates.

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Old 10-04-2012, 12:23 PM   #228
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Awesome! I'm sorry to have found your build history just today, but I'm very impressed from the pro attitude you've put into this build from the very first day. Your control panel makes me speechless!

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Old 10-12-2012, 04:26 PM   #229
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Very nice. I've seen a LOT of brewery builds, and this one has to be at the top of the list. Not only are you using a very advanced system of controls, you're one of a very few who have used peristaltic pumps. Great work

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Old 10-29-2012, 04:06 AM   #230
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Very nice. I've seen a LOT of brewery builds, and this one has to be at the top of the list. Not only are you using a very advanced system of controls, you're one of a very few who have used peristaltic pumps. Great work
Thanks!

I decided to sneak in a test extract batch tonight (NB White House Honey Ale) to put the equipment through its paces before Sandy shuts this coast down. It has been over a year since I brewed last, first time since Oct 18th 2011.







For this brew I have my RO/DI system fully functional including touchscreen control of the solenoid valves. The control panel to power panel connection is also fully functional. I made a quick and dirty interface for the pump which lets me set the RPMs manually. At about 60RPM the pump was moving a good amount of sanitizer through my filter and chiller:


The stepper motor noise is a bit annoying but overall I am pleased with the end result. I shot a brief video of the pump in action, it will be posted in the next couple of days.

15 minutes left of the boil right now.
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Primaries: Air
Secondaries: Lakefront India Brown Ale

On Tap 1: Rootbeer, On Tap 2: NB White ouse Honey Ale, On Tap 3: Nitrogen, On Tap 4: Air, On Tap 5: Air
On Deck: DIPA, Imp Stout, Porter, Wheat, Black IPA

"No sense having empty carboys around when full ones take up just as much space. " - Me
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