Community research

cfastie commented on anyone working on dataloggers for snow depth? 2 months ago

I think a laser rangefinder might work well for this. Put it on a pole and point it downward to m...

MadTinker commented on How to collect a water sample 2 months ago

We take two different samples: one sample is used for local chemistry analysis (alkalinity, pH, h...

stevie commented on How to collect a water sample 2 months ago

Thanks @MadTinker! Question for you - The sample bottles I found here are a little smaller than o...

MadTinker commented on How to collect a water sample 2 months ago

Nice explanation. I do this a few times a month and this is the same procedure accepted in Colora...

TC1994 commented on Horticultural Spectrometer - Assembly III 2 months ago

Hi @jenjimah, thank you so much for sharing your work. I have a question, did this final assembly...

nanocastro commented on Nuestros Suelos: a low-cost toolkit for the participative assessment of soil degradation 2 months ago

Hola Si, estamos trabajando desde hace ya un tiempo con Fernan. Estaría buenísimo si pudiéramos c...

macapola commented on Microscope not focusing right 2 months ago

HI! I have the same problem, did you find any solutions?

drewc228 commented on PMS7003 with Arduino MEGA2560 2 months ago

Hi @vinushi1995..did you get your project working? I am having a similar problem with the PMS7003...

Meculus commented on Microscope not focusing right 2 months ago

I can get it to focus somewhat, but with an onion skin (the main thing I tried), and try to focus...

566303 commented on Assembling the Simple Air Sensor 2 months ago

We are having some issues with our sensor. It does turn green around clean air, but it only turns...

stevie commented on Build a plant-based air purifier 2 months ago

That makes sense! Thanks for clarifying. On Wed, Jan 15, 2020 at 7:22 PM \<notifications@publ...

warren commented on WHATS THE PRICE OF THE SPECTROMETER 3? 2 months ago

Hi, we have a few different options here! https://store.publiclab.org/collections/spectrometry

lev29 commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 2 months ago

Thank you, Chris! You've given me much to read and think about, but please, don't misconstrue tha...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 2 months ago

Using green foliage (or chlorophyll) to set a custom white balance deserves more consideration th...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 2 months ago

The goal of the custom white balance hack is to fool the camera into wildly exaggerating the brig...

lev29 commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 2 months ago

Thank you so much, Chris! With respect to what to use as a reference to calibrate the White Balan...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 2 months ago

If your K610 filter is a cutoff filter that passes wavelengths greater than 610nm and blocks shor...

lev29 commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 2 months ago

Thank you, Chris, for helping to clarify my question. In fact, as you suspected, I was misusing t...

cfastie commented on How can I make IR photos derived from various cutoff useful for creating NDVI (normalized difference vegetation index) images? 2 months ago

`>> for simple bandpass filters, I use the letter "K" followed by the approximate cutoff wa...

dwhite01 commented on Introduction to Spectrometry (& Building a Spectrometer!) Lesson 2 months ago

The instructions for the Papercraft spectrometer Kit are terrible!!What part of the DVD are we su...

stevie commented on What is the air flow requirement for air sampling tubes? Any inexpensive method? 2 months ago

I know @mathew did some work a number of years ago exploring air flow. Here's a link to some of t...

stevie commented on Which is more accurate in measuring formaldehyde: air sampling tubes vs RKI FP-30? 2 months ago

@nshiparo I was wondering if you have any ideas on these questions, or know who else we might rea...

radimir_cacic09 commented on Just some tests :) 2 months ago

Let’s see how this works with images or an embedded video. Is \ *markdown * parsed? Number 1...

keshavgarg234156 commented on What are ways to make dense CSV data more readable? 2 months ago

Whenever we have such large numbers of columns then we first perform correlation analysis before ...

radimir_cacic09 commented on Just some tests :) 2 months ago

Item 1 Item 2 Item 3

liz commented on Terrain Surveying with Emery Boards 2 months ago

thanks for explaining this application Scott, i understand it better now. Thank you for all your ...

liz commented on Is there a way to make a cheaper "UV Hound"? 2 months ago

Sharing back a response from Bryan Parras with permission: I'd love to be a part of developing a...

Ag8n commented on What is the air flow requirement for air sampling tubes? Any inexpensive method? 2 months ago

Check with the individual sampling tubes for airflow requirements. Most manufacturers also sell ...

Ag8n commented on Air sampling tubes for formaldehyde: which brand is accurate? 2 months ago

In industry, we commonly used draeger tubes to measure for a number of contaminants. There are o...

warren commented on Build a plant-based air purifier 2 months ago

Hi, I believe I remember @nshapiro saying that it provided a substrate for bacteria to grow - lot...