Re: [DIYbio] DIY turbidity meters / OD measurements

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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--
-Nathan

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