Re: [DIYbio] DIY turbidity meters / OD measurements

yes, i have been using those weird cuvettes with the side arms. just
had them lying around and they fit very nice and reproducably into my
device. but the laser cutting design can easily be adapted to normal
cuvettes.

best,
m

On Mon, Sep 9, 2013 at 10:09 PM, Nathan McCorkle <nmz787@gmail.com> wrote:
> Are you using a side-arm flask?
>
> On Mon, Sep 9, 2013 at 5:51 AM, Marc Dusseiller <dusjagr@gmail.com> wrote:
>> hoied mitenand,
>>
>> it's a good question, why to use MIDI? i am aiming at an ultra-low cost
>> device, with all parts available in the local electronics store in a
>> tropical jungle.
>> additionally the MIDI devices are not using any drivers anymore these days.
>> but of course it's very limited bandwidth. good enough for a bunch of sensor
>> data from an turbidity measurement. and as brian already mentioned, there is
>> loads of creative media arts people and sound artists that might wanna use
>> such a device and they are using their own tools, synths, max/msp etc...
>>
>> i made a new prototype yesterday:
>> http://hackteria.org/wiki/index.php/DIY_spectrophotometer#Daphnia-2-MIDI_device
>>
>> only had a green LED laying around...
>>
>> tested the device to midify/sonify the movement of small waterbugs/plankton
>> in the cuvette and tested various densities of baker's yeast cultures
>> overnight. the device gave me a difference of apporx 1000mV in 12 hours
>> (sedimentation is neglected, always stirred up the culture before the
>> measurements).
>>
>> but again, this sound interface to a smart phone seems to me interesting.
>> check these examples:
>> http://www.kickstarter.com/projects/lumulabs/lumu-bringing-light-meter-to-the-21st-century
>> http://www.trendhunter.com/trends/smartphone-wind-meter
>>
>> the nice thing is, that we could have a browser interface for accessing the
>> sensors, it's easy to access the line-in, but not other attached hardware
>> via internet-browser. same for the smartphone. so the measurements could be
>> recorded on-site without using a laptop.
>>
>> i will try to callibrate my prototype soon, testing it in parallel with a
>> standard OD meter from a biolab.
>>
>> stay tuned,
>> marc
>>
>> PS: that's the commercial turbidity meter sensor:
>> http://ch.mouser.com/ProductDetail/GE-MC-Thermometrics/TSW-10/?qs=tktsEd1V4BlbFxHNdxJfvA==
>>
>>
>> On Saturday, September 7, 2013 9:41:52 PM UTC+2, DrBrian wrote:
>>>
>>> Midi is good for a number of visual programming softwares like max/msp and
>>> pd/gem.
>>> Nothing stops you going the msp route...if you want ;)
>>> The babysguino is a nice platform cos it uses the arduino ide, but is
>>> super cheap.
>>> 5v logic is also a bit more robust than the 3.3v of pi or msp.
>>>
>>> On 7 Sep 2013 15:29, "John Griessen" <jo...@industromatic.com> wrote:
>>>>
>>>> On 09/07/2013 05:17 AM, Marc Dusseiller wrote:
>>>>>
>>>>> at the moment we are using something like a digistump clone, we call it
>>>>> babygnusbuino, based on attiny85 and compatible to arduino
>>>>> ide. it can send/receive data as a midi-device and costs less than 5$.
>>>>
>>>>
>>>> Not sure why MIDI or analog audio would be good for instrument data
>>>> sending to a smartphone...
>>>>
>>>> an MSP430 for this app could be one of the under $1 ones and not need
>>>> many parts on a pc board,
>>>> so you could use the extra $3 on the bill of materials to buy a bluetooth
>>>> dongle for it to
>>>> send data to your PC/tablet/smartphone with...
>>>>
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>
>
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> -Nathan
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