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Old 11-14-2012, 11:08 PM   #51
Yorg
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Quote:
Originally Posted by brewman !
I think we should split this thread off into RPi + Arduino efforts for those that want that and RPi alone efforts for those that want that.
I agree.



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Old 11-17-2012, 11:21 AM   #52
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New thread started here.
http://www.homebrewtalk.com/f235/sta...2/#post4597971


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Old 11-17-2012, 03:25 PM   #53
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Here is a device that looks like it would interface well with the RPi. It is basically a 15A relay. No soldering required.

Power tail switch
https://www.sparkfun.com/products/10747

Here is another solution that needs 5v to move the coil, requires soldering, and is limited to 8amps if you use the terminals provided.

Relay Board
https://www.sparkfun.com/products/11042
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Old 11-18-2012, 11:45 AM   #54
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Check out this Raspberry PI mod, the Hackberry, which has wifi on board, and extra memory:
https://www.miniand.com/products/Hac...eloper%20Board

 
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Old 11-19-2012, 09:05 AM   #55
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Actually, with more research, I can better see why brewman has gone the R PI / Arduino combo.
Just getting a reliable interface to a relay board means some kind of intermediary board. In which case why not use a dirt cheap Arduino (I can get an uno for under $20) and benefit from all the existing development such as PID libraries etc.
Sorry brewman, I think I was wrong. Then again, I don't know enough to confident about that

What would you use for the wifi cabability - that seems to be expensive.

 
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Old 11-19-2012, 05:51 PM   #56
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Found this guy in youtube, RPI talking directly with a cheap relay board, without any intermediary board. Also code is shown.

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Old 01-19-2013, 05:56 PM   #57
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hey guys, longtime lurker, brewer and EE here who started in automated control systems. Wanted to say the arduino / pi combo is the way to go as it is a great analogy to the PLC / SCADA combo at the heart of a lot of industrial automation.

these relay boards will certainly work, they take a 5V connection and then you can apply 3.3V to control each relay. The thing to watch is probably current draw, i'd probably use another 5V source - having all eight on at once might be a decent draw. in this case, the 3.3V - 5V interfacing is taken care of. Adafruit makes a simple bi-direction interfacing chip for the pi for this specific purpose.

however, this 3.3V - 5V disparity is not the only reason to use an arduino for IO, thought it does make voltage screwups much cheaper, just a new chip in the arduino vs. a whole new pi. The real advantage is that linux is too slow/sloppy to properly control IO, but is clearly the winner in terms of http (web serving), logging (data acquisition) and supervisory control (changing setpoints, starting/stopping processes, etc.).

my ultimate setup will go as follows:
- start with just raspberry pi controlling ferm temp (currently following this tut: http://learn.adafruit.com/send-raspb...i-data-to-cosm)
- expand to control keezer and ferm with arduino/pi combo
- finish electric single tier stand (BCS) and use pi to run web interface showing keezer and ferm temps as well as an interface into the BCS during brewing.

next pi project is a desktop arcade enclosure (MAME) which, IMO, goes great with friends and freshly brewed beer.

keep this thread going and good luck to all

 
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Old 01-19-2013, 06:08 PM   #58
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duplicate post, so edited

Reason: duplicate post

 
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Old 01-26-2013, 04:02 PM   #59
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Quote:
Originally Posted by bschwinn View Post
however, this 3.3V - 5V disparity is not the only reason to use an arduino for IO...
Not knowing what size relay you need the Fotek SSR's can handle the 3.3v directly from the Raspberry Pi. I'll probably use this one to turn on my fridge.

http://www.amazon.com/40A-SSR-Solid-...id+state+relay
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Old 01-26-2013, 04:35 PM   #60
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Quote:
Originally Posted by bschwinn View Post
hey guys, longtime lurker, brewer and EE here who started in automated control systems. Wanted to say the arduino / pi combo is the way to go as it is a great analogy to the PLC / SCADA combo at the heart of a lot of industrial automation.

these relay boards will certainly work, they take a 5V connection and then you can apply 3.3V to control each relay. The thing to watch is probably current draw, i'd probably use another 5V source - having all eight on at once might be a decent draw. in this case, the 3.3V - 5V interfacing is taken care of. Adafruit makes a simple bi-direction interfacing chip for the pi for this specific purpose.

however, this 3.3V - 5V disparity is not the only reason to use an arduino for IO, thought it does make voltage screwups much cheaper, just a new chip in the arduino vs. a whole new pi. The real advantage is that linux is too slow/sloppy to properly control IO, but is clearly the winner in terms of http (web serving), logging (data acquisition) and supervisory control (changing setpoints, starting/stopping processes, etc.).

my ultimate setup will go as follows:
- start with just raspberry pi controlling ferm temp (currently following this tut: http://learn.adafruit.com/send-raspb...i-data-to-cosm)
- expand to control keezer and ferm with arduino/pi combo
- finish electric single tier stand (BCS) and use pi to run web interface showing keezer and ferm temps as well as an interface into the BCS during brewing.

next pi project is a desktop arcade enclosure (MAME) which, IMO, goes great with friends and freshly brewed beer.

keep this thread going and good luck to all
I'm using a Teensy 3.0 in place of the Arduino for my project, and it works very well with the RPi. I'm using a 5V/5A switching power supply and a 3v3 800ma on-board regulator on my system to avoid over-stressing the RPi's or Teensy's regulators.


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