| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "As to your other question about professional sensors -- I think there's nothing super special about the sensor you have, and almost any system (ard..." | Read more » | about 6 years ago | |||
| warren | "Sorry, Nick I think it may still be an open question whether the manufacturer provides greater precision than this. Do you know? And I think the p..." | Read more » | about 6 years ago | |||
| nshapiro | "Thank you, Chris! This is extremely helpful, although a bit disappointing that none of the DIY data loggers would work without serious fiddling or ..." | Read more » | about 6 years ago | |||
| warren | "@nshapiro - I think this is a provisional "yes" -- thanks @cfastie! Which is to say, a good follow-up question for the company is "how much resolut..." | Read more » | about 6 years ago | |||
| zengirl2 | "@stevie Wow, that is exciting. I'm almost picturing pomander balls of this stuff hanging around. " | Read more » | over 6 years ago | |||
| stevie | "Here's an answer coming in from Ann Marie Carlton who works with an Atmospheric Multiphase Chemistry Research Group at University of California, Ir..." | Read more » | over 6 years ago | |||
| severo_bo | "Maybe uMap (https://umap.openstreetmap.fr/en/) could be a good solution for you. " | Read more » | over 6 years ago | |||
| alyd_vt | "It's awesome to hear about your participatory mapping work in Panama! It's great that you're testing out DigDem's Mapeo, I'm interested to try it m..." | Read more » | over 6 years ago | |||
| cfastie | "Any Arduino-based data logger should be able to read the signal from that sensor and save the reading at regular intervals. The main obstacle is th..." | Read more » | over 6 years ago | |||
| cfastie | "Thanks Nick, The $9/month plan could work. It allows 20k checks per month, or one every 3 minutes which is more than we need. Multiple notification..." | Read more » | over 6 years ago | |||
| stoft | "Pollution comes in many forms and many of the worst contaminants will not alter the appearance so visible light spectrometers (i.e. PLab types) wil..." | Read more » | over 6 years ago | |||
| Ag8n | "We always went with the longest path length. The visual test was done with 50 cm color comparison tubes. Very long for visual. Maybe you could d..." | Read more » | over 6 years ago | |||
| amirberAgain | "Be careful! light in the 450-480nm range (royal blue) is dangerous to unprotected eyes! 430 is not as bad but be aware! http://www.cree.com/led-com..." | Read more » | over 6 years ago | |||
| amirberAgain | "Can you measure pure water? Probably so! While largely transparent in the visible water absorb in the 700-850nm range, note that to image in that r..." | Read more » | over 6 years ago | |||
| nshapiro | "Ah, bugger! I'm sorry that didn't work out! This one can check 5 pages every 6 hours. https://distill.io/pricing I wonder if you could set it up so..." | Read more » | over 6 years ago | |||
| thangvu | "I have no solution for multi-wavelength source like a spectrometer. I will try with another wavelength. " | Read more » | over 6 years ago | |||
| thangvu | "Thanks for your answer, I have the standard solution of 5-10-20..70 pt / cb (I borrowed), according to the standard method, when measured at 430nm,..." | Read more » | over 6 years ago | |||
| Ag8n | "Do you know what APHA values you will be observing? I was typically observing values under 25. And yes, a florescent light was very helpful again..." | Read more » | over 6 years ago | |||
| Ag8n | "If you used the right lamp, you would be ok. You need to use a broadband source, as stoft noted. " | Read more » | over 6 years ago | |||
| thangvu | "My idea is to use a 430nm wavelength to measure the color of the water, so, I use a 430nm (+ - 10nm) led as the source, but the 430nm led seems to ..." | Read more » | over 6 years ago | |||
| thangvu | "sorry for saying it is unclear, with wastewater, the color of the water partly assesses the level of water pollution. " | Read more » | over 6 years ago | |||
| stoft | "Depending on what information is needed from the spectrum (i.e. like the entire available spectrum, using a CLF will not be useful. A broadband sou..." | Read more » | over 6 years ago | |||
| thangvu | "Thanks for your helpful answers " | Read more » | over 6 years ago | |||
| warren | "Awesome!!! " | Read more » | over 6 years ago |