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Old 07-19-2012, 02:13 AM   #41
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Looks good!

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Old 07-19-2012, 03:00 PM   #42
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I just stumbled on to this thread because I had a similar idea of using the android platform to run an automated brewing system. Having beersmith files being pulled in was never a thought of mine since I don't use it. However, that would be a great feature for those that do.

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Old 07-21-2012, 03:21 PM   #43
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Quote:
Originally Posted by Adeering View Post
Thanks for the info, Ill look into those and decide. I saw the one you posted on amazon and it was almost $30 so I turned away from it, but thats a lot cheaper on ebay, Ill have to consider. Though I am liking the idea of the laptop charger because it already controls and regulates the output and has the easy usb interface which plugs very nicely into the Mega ADK which im using.

Got a nice little shipment of some parts to start piecing some stuff together so going to start the build part of the thread
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By the time you get valves and stuff like that in the mix, you will need quite a bit of power at some voltage. Low voltage is always going to be a bit safer than running them off of 110 or 220. I'd go with a $10 bulk supply at +12VDC and get the relays / valves / what ever to match than voltage. +24 is also a reasonable choice, but the relay boards are a bit harder to find / more expensive.

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Old 07-22-2012, 01:25 AM   #44
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So looking for a cheap plastic enclosure, I can get away with anything as small as 12x10x4. Waterproof isnt a huge deal for me as my plan for panel location is away and/or protected from general splashes. Any ideas?

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Old 07-24-2012, 02:56 AM   #45
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So just got together a wiring diagram. I think its good, but wanted to get opinions.

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Old 07-25-2012, 06:54 PM   #46
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So a few things I am curious about.

What pumps are you using? I hadn't thought about finding a DC pump, but now that i do, that would be pretty sweet being able to control the pump speed. If that is what you are doing, you may want to have some low pass filtering to smooth out the ripple from the DC-DC SSR if you are using PWM.

Why the 4 pole switches on your elements? Looks like you have your interlock control circut feeding through 2 of the poles. That seems either redundant or defeating the purpose depending on how they switch in relation to each other.

I'm guessing all the input to ground resisters are pull down resistors. Is that required in this setting?

That's all I can see right now, other than that everything looks good to my non-electrician eye.

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Old 07-25-2012, 07:18 PM   #47
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The pumps are Topsflo 15PV and can run on up to 24VDC, Im not regulating the flow with pwm just simple on/off control.

The switches are 3 position switches, with a set of Normally Open to talk to arduino via 5VDC to know whether the arduino or android is setting the desired temp. The second set of Normally Open is to give power to the 120v coil and The last set are Normally Close for the interlock and needs to go through both positions to make sure no power is able to go to the elements.

You are correct with the resistors and is needed otherwise the arduino registers inputs fluctuating with noise

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Old 08-01-2012, 12:49 AM   #48
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Now with the Raspberry Pi out I'm thinking that is even a better way to go.
http://www.homebrewtalk.com/f235/ras...roller-344529/

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Old 08-02-2012, 12:55 PM   #49
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I have been looking at the Raspberry Pi for some other projects. The problem I see with the Pi (and a minor one that is easily worked around) is the lack of inputs/outputs for sensors and parts. There are workarounds that are easy and well documented (a lot use an arduino to communicate with the Raspberry Pi) but still its extra work. And since the Arduino mega is more than enough to control what I need there really isnt a need for it. Now if I was planning something crazier then maybe

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Old 08-12-2012, 02:22 PM   #50
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Ok little update to the project, ended up getting a metal 12x12x6 enclosure, its gonna be a little tight but i think having only the one arduino instead of multiple PID controllers will help. Got the start of holes drilled and just ordered the last receptacle from ebay. So next week hopefully Ill get the last of the parts and can do the wiring. Will post pics once everything is wired.

I also added in the ability to change the elements to PID or manual mode and also set a power percentage. Working on just getting the arduino side done right now and will do the programming for the android side while deployed. Also switched from 4 buttons to a joystick. This gives me the same functions as the buttons, but require less resistors and connections and easier to install.

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