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	FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
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Contents:
  Re: Bubble Logger (Natalie Hirneisen)


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Date: Thu, 11 Jun 2009 15:23:08 -0400
From: Natalie Hirneisen <cave.natalie at gmail.com>
Subject: Re: Bubble Logger

The Bubble logger is a interesting idea.
Here are some thoughts I was pondering.

Matlab or equivalent needs a PC to run on,
To reduce the hardware, maybe try a
dsPIC (a microcontroller) from Microchip
to take care of the signal processing and log  the
bubble events.
Digikey has an evaluation kit for the
dsPIC for about $60 that connects to the
USB port on your PC and has a mic amp + AtoD built in.
When done fermenting, one could
just download the data from the device flash memory.
One could also connect an I squared C temp sensor to the
processor to log temp and how that changes the bubble rate.

Another thing, normally a blow off tube is needed
the first few days of fermentation, maybe a specialty
designed high capacity airlock would help?
regards,

Natalie


> Date: Tue, 9 Jun 2009 14:14:16 -0700 (PDT)
> From: Matt <baumssl27 at yahoo.com>
> Subject: Cheap and Easy Bubble Logger
>
>
> Airlock bubbles are a fun and potentially useful way to
> look at fermentation, and various automatic bubble-logging
> systems have been devised (see HBD archives, various web
> sources).  For those of us familiar with MATLAB, here's an
> idea for *extremely* cheap and easy bubble logging:
>
snip


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