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Old 01-19-2014, 06:31 PM   #401
rabeb25
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Sorry default to 0oz poured, or have a full keg. However you want to look at it.
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Old 01-19-2014, 07:02 PM   #402
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Oh. The keg column is placeholder for the flow meters.

Flow meters won't be incorporated until at least v2.0.0.

You can manually update the SQL database. But I'd recommend you just turn the column off altogether.
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Old 01-19-2014, 10:52 PM   #403
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On my way into town this morning, I stopped by Walmart to return an old truck battery. Found this:



I figured, "well ****, if a redneck can make a bacon bowl, I can certainly solder!"

Went down to Radio Shack, picked up some goodies. Namely:

62/36/2 Rosin-core Solder (1.5 oz roll)
Desoldering Vacuum Bulb
Misc project wire
A 500-pack of assorted resistors (they didn't have any 270 ohm loose)
A rigid jumper wire kit for breadboards

Haven't soldered in over 10 years, since I had to build an FM transmitter to retrofit an RC aircraft. Watched a quick refresher video to re-familiarize myself with the finer points of soldering:

Jumped right in, using only a scrap piece of cardboard, soldering station and wet sponge. I don't think my results are professional-grade, but they look like they'll get the job done.

Parts from the kit:

Instructions from the kit: http://openmicros.org/index.php/arti...3-slice-of-pio

First row of the IC socket done (soupy looking stuff is rosin that hasn't dried yet):



IC socket completed, plus the two 8-port ground headers (top row) and two 8-port I/O headers (second row). The capacitor at bottom was certainly the hardest joint. I know it looks like I bridged there, but it's just the viewing angle. There's a pretty decent gap between them.



GPIO header soldered on (bottom right rows), MCP23017 read to snap in.



Total build time was about 45 minutes. Would have been much shorter, but I was taking my sweet time.

Lessons learned:

If you're buying solder, grab .032" instead. With .022", the feed rate was pretty fast. Hard to stay steady at that rate.

Bend the capacitor pins to hold it in place. Don't fight with gravity while trying to solder.

My iron came with an ST2 tip. It was larger than most of the pads on this project. I would have felt much more comfortable with an ST1 tip or even smaller.
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Old 01-20-2014, 02:10 AM   #404
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So, I have the Pi and a breakout board built. I have a breadboard and wires. I should have everything I need.

Yet the longer I sit here fiddling with bits of wire, the more I realize:

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Old 01-20-2014, 02:58 AM   #405
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Quote:
Originally Posted by thadius856 View Post
So, I have the Pi and a breakout board built. I have a breadboard and wires. I should have everything I need.

Yet the longer I sit here fiddling with bits of wire, the more I realize:

Hahahaah my god man, I about lost it on that meme lulz
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Old 01-20-2014, 04:54 AM   #406
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Figured out the wiring. Really wasn't all that bad.

Set the Pi up for I2C, Python, etc. Found a sample script that looks like it should listen for the tap handle opening once, and I can mod the heck out of it for our purposes.

Problem is, it keeps throwing Python errors at me. Hopefully somebody on the offical RPi forums will give me a reply so I can move forward. :\
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Old 01-20-2014, 07:05 AM   #407
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My first night of actually testing the flow meter code was hugely disappointing. In the end, I've decided that I'm trying to walk before I can run. I'm going to pick up a multimeter tomorrow to make sure that I've wired the flow meter right, then actually connect it to the pi. I think I'm close, though.

 
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Old 01-20-2014, 02:28 PM   #408
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Thought this was appropriate here:

http://xkcd.com/1319/
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Old 01-21-2014, 03:29 AM   #409
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Take a look at the adafruit kegomatic project. It looks like they took the kegbot and made it run on just the rPi with the flowmeter...

http://learn.adafruit.com/adafruit-k...pberry-pi-code

https://github.com/adafruit/Kegomatic

Granted, all they're doing at this point in time is posting to twitter... but the flowmeter.py file is pretty good for reading the flowmeters.

 
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Old 01-21-2014, 03:42 AM   #410
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Mmmmm, yes. Looking at flowmeter.py, looks like they don't actually do any GPIO there. Just number crunching the pulse data.

Looks like they import flowmeter.py into kegomatic.py, where the GPIO actually takes place. How, I'm not entirely sure. I can barely read Python at this point, let alone tweak it up.

The article's an interesting read. Good stuff in there. I may have to try wiring direct to the Pi's GPIO pins (conditioned to 3V3 of course) and see if I can get this to run. Then, hopefully a switch from GPIO.RPi to I2C wouldn't be too difficult.

Alternatively, I can attempt to learn enough C to utilize wiringPi.

Neither option sounds terribly fun. :\
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