craftbrew pi build

[Clparker23]

I've been researching a bit and want to get a build started on a 2 heater/2 pump system:

I have a few questions.
What is typically used to power the raspberry? 240v to 120v to 5v?
Do I need an adrino board as well or is it all done with raspberry?
Do I need coils for each Heater?
Will a 2 channel 10amp shielded relay work as a relay for the pumps or do they need 25amp ssr's?
Where can I find a switch for pumps that are on-off-auto?

If anyone knows of a build similar that they can link me to, I appreciate it.

 

[clearwaterbrewer]

I used this DIN Power Supply from eBay.. (note, some CBP printed ciruit boards have a nice 12v to 5v regulator daughterboard, and you *may* then want a 12v version, or you may want to have both..)

You do CraftBeerPi with just rPi (or others with with arduino - look at ardbir or brucontrol, but arduino requires more of what you would call 'programming' or 'flashing') caveat - No one has done it, but I think that a hybrid solution of Arduino for the dedicated controller and rPi ZeroW for the 'front end' (server/web interface, flashing the arduino, etc) would be the ideal setup, but don't hold your breath, it may never happen..

Coils? you will need Solid State Relays if you want to do PWM (variable power) heating, which is needed for RIMS/Boil. You can get away with 'relays' or 'contactors' for something like a HLT.

For the pumps, you will need a 'relay board', and a 'powered relay board' at that, you cannot directly turn the relays on from the rPi, the board has to be the sort that has transistors on it to amplify the signal and turn on the relays, some turn on the relays with 3-5v, some turn it on when you ground the input, both will work, but know what you are buying. This board also needs a power supply.

for hand-off-auto switches, I bought these years ago from automation direct :
GCX3263-120L SELECTR, 22mm, PLASTIC,YEL,MNTND,120V, 3-POS, LED ILLUM, 2 N.O., 2 N.C.
GCX3264-120L SELECTR, 22mm, PLASTIC,BLU,MNTND,120V, 3-POS, LED ILLUM, 2 N.O., 2 N.C.

All this being said, you may want to just fork out the $50 to have a v5.0 PCB board assembled and tested for you... heck, you should buy 2 boards and 2 rPi's, you may fry one if you are brand new to this game... see if someone local to you is doing this, even travelling 50 miles to see someones rPi setup would be worth it, and heck, they may have a hand-me down system you can get cheap...

 

[Clparker23]

Ok, things are a little clearer after a day of browseing the inter webs and your reply. A quick search for PCB board came up with terragady, which I now have on my list, I’ve seen that mentioned in a post. I’ll have to draw a schematic of what I think it needs to be for just a tad more help on it. I have not seen a straight forward schematic, I’ve been zooming in on others build pics trying to figure out little details here and there. Thanks for the help.

 

[Inspire]

Some schematics I have. These are not mine, just collected on the internet. Sorry I don't have links to where I got them from. I havn't tested any of these, so beware. Just use them for ideas. I hope they help you.

 

[golfindia]

You can run 5v relays directly from the RPi board. You don't need to use externally powered relays.... You just have to make sure you have enough 5v amperage If you use a lot of them simultaneously. I run 4 of them with a 6amp PS.

 

[Simphoto02]

So please tell me more about the relay board..,. I am in the process of building something similar. Links, etc please