Inkwell: Authors and Artists
Emily Gertz (emilyg) Fri 24 Aug 12 12:43
For what you have in mind, Gary, it's probably worth considering moving up to more professional-calibre gear. Those ion specific electrodes are not cheap, AFAIK. Patrick can say more, I think.
Gary Nolan (gnolan) Sat 25 Aug 12 01:14
The hand held meters are an arm and a leg also. Part of why these little guys looked intriguing. Companies like Vernier and Ocean Optics have been putting out little portable spectrometers that are basically an optical compartment hooked to their unit by fiber optic cable and USB out. A job for Arduino?
Patrick Di Justo (justpat) Sat 25 Aug 12 07:28
In the case of ion specific electrodes and the like, a lot (maybe half) the cost is in the sensor itself. So you might safe half the cost by connecting a specific sensor to an Arduino. One elaborate Rube Goldbergian approach might be to have a small arduino controlled micro pump extract a small sample of water, which is then injected (via another arduino controlled micro pump) with a small amount of chemical reagent, which turns color based on the level of whatever it is your measuring. This would be imaged by a small color sensor, which returns an RGB reading of the color of the liquid inside the test tube. The whole thing might cost as much as an ion specific probe, and be prone to more frequent breakdowns, but think of the glory!
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