Good Old times.. 5 years of geeking around with turbidity meters. Read an overview here: http://hackteria.org/projects/turbidity-meter/
And more notes about Kresse-Shields, KafiSchnapps detektors, Daphnia2Midi controllers and more: http://hackteria.org/wiki/DIY_turbidity_meters
If you want to reprogram the attiny, use the bootloader developed by anyma and iyok.
The TurbiGnUSB is detected as a keyboard. The LED inside the optical chamber is always on. press the button and the device starts typing the value into your laptop, use a spreadsheet or notepad to record the measurements.
- Cuvettes (plastic)
- some colorimetric test
- choose the right LED color for your test
- time