DIY turbidity meters

Spectroscope
coming soon, first experiments by Andy and dusjagr and GaudiLabs Open Fiber Spectrometer looked great... see more details on DIY spectroscopy

= Turbidity Meters =

we started a github repo

New TurbiGNUSB by Gaudi Industries & Söhne Inc.
"It's not REAL open source if it hasn't used a 3-D printer AND a laser-cutter" - anonymous 2015







Turbidity Meter made in Germany


http://www.thingiverse.com/thing:1434139

BabyTurbiduino aka Nyamuk Synthisaaaiza
Pretty much the same as below, just made new designs, larger and easier to produce locally here in Yogya. added speaker and VU meter extension... testing it now!



Download the files here for printing the pcb and the original design

Prototyping








Kafi-Schnapps Detektor


See more info and file on Thingyverse

Files for Ardunio and pd



Daphnia-2-MIDI device


Some bugs in the cuvette:



Testing different yeast culture densities:



Tests with Bengt et al
It woooorks!

we finally soldered a mini-jack plug to go directly into the line-in.... muuuuuch better quality than through the air :-) who would expect that!



We made various tests the other night, trying to have the Baby communicating like a modem, bliip bliip bluup, first using a small piezo-speaker or the hi-fi in the living room. it's looking good:



the free software Sigmira is kinda useful to test http://www.saharlow.com/technology/sigmira/

Bengt had to modify the SoftModem library to work with the attiny85, some different names of the PORTs and TMSKs and experiment with different frequencies for the carrier and baudrates.

you can easily check the signals also with audacity. display as spectrogramm and do spectral analysis.





FSK-Baby
We had to do some changes to the SoftModem library... more soon.

With the following speed setting it works fine, but slow:


 * 1) define SOFT_MODEM_BAUD_RATE  (50)
 * 2) define SOFT_MODEM_LOW_FREQ   (600)
 * 3) define SOFT_MODEM_HIGH_FREQ  (850)
 * 4) define SOFT_MODEM_MAX_RX_BUFF (32)

resources
some inspiring links:

http://www.kickstarter.com/projects/lumulabs/lumu-bringing-light-meter-to-the-21st-century

http://www.trendhunter.com/trends/smartphone-wind-meter

http://pinoutsguide.com/HeadsetsHeadphones/samsung_moment_pinout.shtml

http://sree.cc/electronics/arduino-as-an-fsk-modem

http://forum.arduino.cc/index.php/topic,19648.0.html

Interesting article by tom keene about the iPhone boundary, also talking about the SoftModem approach, but finally just going into the phone with an oscillation. http://www.theanthillsocial.co.uk/sites/theanthillsocial.co.uk/files/TheAppleBarrierTomKeene.pdf

http://colinbookman.com/2014/03/23/micio/

SoftModem Library
http://code.google.com/p/arms22/downloads/detail?name=SoftModem-005.zip&can=2&q=SoftModem+label%3AFeatured

https://code.google.com/p/arms22/downloads/detail?name=SoftModem-005.zip

http://arms22.blog91.fc2.com/blog-entry-366.html

some japanese via android

for iPhone

Schematics: http://www.flickr.com/photos/arms22/4821347734

FSK java script for browsers: https://github.com/NeoCat/FSK-Serial-Generator-in-JavaScript/

more about FSK, Frequency Shift Keying

http://en.wikipedia.org/wiki/Frequency-shift_keying

abnother one
https://code.google.com/p/androino/wiki/AndroinoTerminal

Turbidity meter, visual
Secchi disc

http://youtu.be/LZ9WLnCAd1M?t=54s

Turbidity sensor
simple light absorbtion at a specific wavelength of a cheap laser, easy detection of turbidity.



turbidity to pd tools:





Commercial Turbidity Sensors
see this for dishwashers...

http://www.appliancezone.com/ShowProduct.aspx?ID=48034

http://ch.mouser.com/ProductDetail/GE-MC-Thermometrics/TSW-10/?qs=tktsEd1V4BlbFxHNdxJfvA==

some links and snippets
The Turbidity Module uses an IR LED with a wavelength of 860 nm to meet ISO 7027 requirements for Turbidity water quality measurements.

http://www.turnerdesigns.com/products/laboratory-fluorometer/trilogy-laboratory-fluorometer

UV-vis absorbtion spectrophotometer
UV-vis spectrometer, would be even nicer, added white LED instead of laser, changing colors with simple light filters. but they have almost no UV, so added a UV led. turns out the CdS photoresistors are really slow and not very sensitive at UV also...



also we are working on a hacked line-scanner to look at the spectra after passing a prism or grating.