[DIYbio] DIY turbidity meters / OD measurements

hello fellow bio-tinkerers, hi sebastian,

the topic of cheap turbidity meters popped up again in another discussion.

i have been developing simple laser-cut shields for arduinos. or also stand-alone units to measure light-absorbtion through the standarized cuvettes:

sorry for the lousy docu sofar...

laser cutting seems to me more useful for this application. good precision and much faster production. the cut sides of the wood is nice black and light absorbin/non-reflecting. and the device can be assembled layer by layer, embedding the LED and sensors into an optical channel.

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$. but we have been thinking of additionally communicating to the device using an audio-protocol, meaning we could use the line-in of a smart phone to read the data.

more soon,
marc




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