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Old 02-24-2013, 01:53 AM   #1
DougEdey
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Edit: Removed at the request of the brewtroller people.



 
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Old 02-24-2013, 03:22 PM   #2
Yaksha808
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A friend of mine pointed me in the direction of this tiny computer, do you think it could work with a full electric brewery system??



 
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Old 02-24-2013, 03:32 PM   #3
DougEdey
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I'm using it with a two vessel system as we speak, my friend is going to start using it on a 3 vessel next week, and I'm add variable valve control (so it's not a full open/closed value) and pump control in the coming weeks.

 
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Old 02-24-2013, 05:27 PM   #4
jimmayhugh
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Quote:
Originally Posted by Yaksha808 View Post
A friend of mine pointed me in the direction of this tiny computer, do you think it could work with a full electric brewery system??
Might want to take a look at what I'm doing.

I'm working on the PID section now.
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Old 02-24-2013, 05:55 PM   #5
jimmayhugh
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First: The RPi GPIO pins are not 5V tolerant, so you are inviting trouble if the 100ohm resistor is inadvertently shorted during operation. You might want to consider tying the DS18B20 VCC to 3V3, as they work just fine at that voltage.

Second: You might want to consider increasing the size of the resistor. At 5V and 100ohms, it's possible to exceed the PRi's safe current limits. Here is an explanation of that. I use a 4k7 resistor at 3V3 over very long ( > 50ft) lines with no problem.

Third: You're driving what appear to be 5V relays with the 3V3 output of the RPi. Depending on the specs of the relays, this may or may not be adequate for proper drive. The SSRs I use operate at from 3-32 VDC.

Just some points to ponder...
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Old 02-24-2013, 05:59 PM   #6
DougEdey
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Quote:
Originally Posted by jimmayhugh View Post
First: The RPi GPIO pins are not 5V tolerant, so you are inviting trouble if the 100ohm resistor is inadvertently shorted during operation. You might want to consider tying the DS18B20 VCC to 3V3, as they work just fine at that voltage.
That is actually a diagram issue, it's actually a 4k7.

Quote:
Originally Posted by jimmayhugh View Post
Second: You might want to consider increasing the size of the resistor. At 5V and 100ohms, it's possible to exceed the PRi's safe current limits. Here is an explanation of that. I use a 4k7 resistor at 3V3 over very long ( > 50ft) lines with no problem.
see above

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Originally Posted by jimmayhugh View Post
Third: You're driving what appear to be 5V relays with the 3V3 output of the RPi. Depending on the specs of the relays, this may or may not be adequate for proper drive. The SSRs I use operate at from 3-32 VDC.
Relays are 3-32V, again, diagramming issue, I forgot to change the default values...

Thanks for the input though

 
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Old 02-24-2013, 07:56 PM   #7
RidingDonkeys
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I'm tuned in. There is potential here.
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Old 02-26-2013, 06:29 PM   #8
audger
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Originally Posted by DougEdey View Post
Edit: Removed at the request of the brewtroller people.
thats too bad that they would take issue... makes me think less of them as a company. the patent and trademark abuse in this country is disgusting. i could see taking offense if you were making money off of it, if the hardware or software was similar to theirs in anyway or if this was anything more than some homebrew (pun intended) project... but its not.

its also too bad for them that the post was cached in google and will live on forever on the internet regardless of their efforts to censor your discussion...

http://webcache.googleusercontent.co...&ct=clnk&gl=us

 
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Old 02-26-2013, 06:31 PM   #9
DougEdey
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I'll be republishing it, I have to remove all traces/references to the Phrase "BrewTroller", I thought it was a common phrase like "Keggle" or "Kegerator".

I've already got a new name though I'll post a new thread at the weekend.

 
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Old 03-10-2013, 11:46 PM   #10
DougEdey
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For anyone listening on this thread, reposted under Strangebrew Elsinore; http://www.homebrewtalk.com/f170/str...roller-396627/



 
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