RE: [DIYbio] DIY Science Equipment contest

While still kind of on topic, what would you guys like to see in a
turbidity spec?

So far my plan is as follows:

3D printed chassis
takes standard 12.5mm cuvettes (10mm path)
~3" tall 2" wide square footprint with lid
Tiny LCD screen and two buttons as stand alone unit for blanking and
reading
The whole device is an arduino Sheild with open source standard curve
tools, simple GUI, logging, etc.

I was thinking of using a digi stump but it would drive cost up. The
original plan was a stand alone battery powered module that can be
placed anywhere and pocketed when needed.

All software open source as well as design CAD, STL, OBJ, Eagle for
sheild circuit, and parts list.

I'm debating whether or not to include a built in generic arduino or
keep it a sheild.

The arduino's main clock is precise enough for 1Hz readings but I would
be happier designing a op-amp clock a la 555 or edge counter chip for
improved accuracy and precision. With some low level arduino code I
managed to get the interrupts to work and the signal is fairly stable.
Best readings are made by blanking for each sample. The code will be in
Mono. Hope no one minds too much about that.

Other fancy things like blue tooth and larger sample areas for readings
while in the shaker incubator or SD card for CSV output will obviously
drive up costs. I'm not looking nor intending or a silly profit margin
so version 1 will be base line needs and a robust GUI. Thoughts?

Sebastian S. Cocioba
CEO & Founder
New York Botanics, LLC
Plant Biotech R&D From: John Griessen
Sent: 9/6/2013 4:22 PM
To: diybio@googlegroups.com
Subject: Re: [DIYbio] DIY Science Equipment contest
On 09/06/2013 07:36 AM, Josiah Zayner wrote:
> Submit your stuff and win some cash money and some publicity, probably more than you would have received without the contest.

Oh, a kickstarter for a well planned one might do better by far...
And that goes for Sebastien's OD600 meter for $25, if it has a few nice features
and looks like it is worth $25 and not going to quit in weather
changes and time.

Some of us worry about the licensing because that's the way of the
manufacturing world
and we want to make a difference by freely outflowing good product at low prices
without attracting lawyer letters to desist and to pay royalties.

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