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Kegbot (flow meter and digital taplist) project


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#21 Mr Wibble

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Posted 17 May 2017 - 04:54 PM

Could you please give us a few notes on how you performed the calibration ?



#22 Moad

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Posted 17 May 2017 - 05:29 PM

She does not know the URL, if she does find it...I will change it. 

 

 

 

Calibration I used water to get each meter ball park measurements using a 500ml flask. I then hooked up the beer and poured ~250-350 mls into a schooner and weighed it vs an empty schooner. 

 

I assumed 1g = 1ml which is probably wrong but the measurements I am getting from kegbot seem pretty good to me. Around 415-430 for a full schooner with a small amount of head. Slightly over estimating is good for me

 

I then adjusted the tick/ml and poured again. I will keep testing as I pour for a little while, until I am happy it is reliable and consistent


Edited by Moad, 17 May 2017 - 05:31 PM.


#23 dblunn

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Posted 17 May 2017 - 08:26 PM

What about when SWMBO has a higher score than you :blink:

 

Jeez, I never considered that ever happening.

 

I assumed 1g = 1ml which is probably wrong but the measurements I am getting from kegbot seem pretty good to me. Around 415-430 for a full schooner with a small amount of head. Slightly over estimating is good for me

 

 

Use the FG, so if it were 1.010 then 1 ml would be 1.01 g . That is only 1% so not worth worrying about.



#24 contrarian

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Posted 18 May 2017 - 08:19 AM

How are you measuring the starting volume? I guess if it's a full keg it isn't too hard but measuring partially filled kegs could be a bit tricky. Apologies if this has been answered in a previous post.

#25 Moad

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Posted 18 May 2017 - 10:15 AM

Rough guess for existing kegs, I could weigh them to be accurate.

The whole thing is a bit of fun and to roughly know when I'm going to kick a keg so not trying to be accurate to the ml

#26 Clayton Spencer

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Posted 18 May 2017 - 10:44 AM

Rough guess for existing kegs, I could weigh them to be accurate.

The whole thing is a bit of fun and to roughly know when I'm going to kick a keg so not trying to be accurate to the ml

 

I weighed my kegs while empty and stuck a sticker with the weight on the keg. when hooking up a new keg, weigh it and deduct the kegs weight and put that into Kegbot as the starting volume.

 

I've stopped recording the drink lately as my system is a manual glass weighing mod after each pour, worked well and now interested in using these flow meters, thanks for the feedback. The Swissflow meters @ $60US each make it an expensive option

 

if your interested http://kegbot.spencertribe.com:8000

 

Had a few parties using it and the manual weighting gets way out towards the end of the night, lots of missed pours or double pours recorded.



#27 Moad

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Posted 19 May 2017 - 10:10 AM

I got a double pour last night, have you done any troubleshooting on that?

#28 Clayton Spencer

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Posted 19 May 2017 - 03:30 PM

I got a double pour last night, have you done any troubleshooting on that?

To be honest I thought it was a User (drunk User) problem as my system is a user tap on the screen when they have the glass on the scales. 

So never looked further into it. It's possible the System is posted the same data twice to the server.



#29 Moad

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Posted 21 May 2017 - 07:42 AM

I've only seen it once in 100 pours, it was an identical pour. Could have been no acknowledgment from the server to the core. 

 

Anyway even with this and one or two pours registering way off I am loving the system. I've dialed all my taps to within 10ml on a schooner now, the test will be if the flow rate needs tweaking on a new keg. I'm wondering if the viscosity of the beer affects the measurements. I'll be tapping a dark IPA after a helles so that should be a decent test



#30 Clayton Spencer

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Posted 22 May 2017 - 10:22 AM

Moad, good to see it's working well so far. Which connectors did you use to connect the flow meter too your beer lines? I'd like to use a 8mm quick connector thing but can't see them on the kegking site



#31 Moad

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Posted 22 May 2017 - 12:44 PM

cheers mate, they are just 3 pin connectors and 5 pin sockets from Jaycar. They fit together and you just use 3 of the 5 pins on the sockets, just in case you weren't sure!

 

https://www.jaycar.c...e-plug/p/PP0302

 

and

 

https://www.jaycar.c...socket/p/PS0348

 

I'm sure there are better options but these work for me and were available on the day



#32 Clayton Spencer

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Posted 23 May 2017 - 01:01 PM

Jaycar don't sell them any more, I got mine from AliExpress. They sell on eBay as well if you just want one or two.

http://m.ebay.com.au...d=1509142147010

 

Moad Sorry I meant the connecting to the Beer line, i've got 8mm (I think) beerline and the flowmeter you linked early looks to be a 1/2" thread (which sort NPT etc I'm not sure)



#33 Moad

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Posted 23 May 2017 - 02:24 PM

ahhhh!

 

I use 5mm line (remember its ID not OD) so needed a small barb.

 

https://www.aliexpre...0608.0.0.iNrh7s

 

Doesn't affect flow rate or foaming etc.

 

Cheers



#34 stuartf

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Posted 28 May 2017 - 02:25 PM

Hey moad, really interested in getting something like this set up on my kegerator. How difficult for a non-IT person to build? Also I was thinking of adding in pressure sensors so I can confirm what pressure each keg is at, not sure how easy that would be to do though?

#35 malt junkie

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Posted 28 May 2017 - 04:53 PM

Hey moad, really interested in getting something like this set up on my kegerator. How difficult for a non-IT person to build? Also I was thinking of adding in pressure sensors so I can confirm what pressure each keg is at, not sure how easy that would be to do though?

Each flow sensor requires an interrupt circuit, each pressure sensor also requires an interrupt circuit, so an arduino could only handle I think 6 taps with flowmeters or 6 pressure sensors or three with both.



#36 Moad

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Posted 28 May 2017 - 10:58 PM

Not sure about pressure sensors but malt junkie is right, using the arduino mega you can have a max of 6 taps. The back end will read multiple boards, you just have to assign them serial numbers.

 

Non IT savvy you could work it out with some help (which I am happy to offer). The hardest part is the server side which took some effort for me with minimal linux knowledge. Where are you located?

 

Something I have noticed after tapping a new keg tonight and I think I mentioned this earlier about pressure being consistent... Because of the minimal headspace in a new keg the pressure drops off quickly when you pour which alters the flow rate. This has affected the measurement of flow for the first few schooners. Once you are ~2L into the keg it isn't an issue but something to be aware of.