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donblair commented on Riffle Beta Release: Feature Requests / Review? almost 3 years ago

-- a CR1220 coin cell.

mathew commented on Riffle Beta Release: Feature Requests / Review? almost 3 years ago

@donblair what battery is the coin cell battery?

Mnzr commented on NDVI cape for the beagle bone. almost 3 years ago

What model cameras are you using?

ygzstc commented on Using the Spectroscope for Analysis of Concentration (Beer's Law) almost 3 years ago

Yes the Beer-Lambert Law is based on -log(I/Io) but it's applicable for a single wavelength value...

cfastie commented on Shallow note on depth almost 3 years ago

For $25 that hydro generator has got to be a good thing. It is an impartial solution for my sprin...

warren commented on Using the Spectroscope for Analysis of Concentration (Beer's Law) almost 3 years ago

It's odd -- I see the graphs. Straylight, can you contact web@publiclab.org so we can figure out ...

straylight commented on Using the Spectroscope for Analysis of Concentration (Beer's Law) almost 3 years ago

Thanks for the question. My apologies that all of the graphs appear to have vanished (they have f...

donblair commented on Shallow note on depth almost 3 years ago

Oh, exciting ... it'd be fun to demonstrate anything powered by moving water. Maybe this thingy ...

cfastie commented on Shallow note on depth almost 3 years ago

That hydro generator says it needs 3 liters per minute, which we have. Sorry about revealing you...

donblair commented on Shallow note on depth almost 3 years ago

Exactly. Was confusing for me, too, as I'd been nursing a rather fixed mental picture of a paral...

cfastie commented on Shallow note on depth almost 3 years ago

Why does this work when the two wires (the extension cord) are insulated? It must be that the ele...

donblair commented on Shallow note on depth almost 3 years ago

This sounds like it might prompt a PVOS research trip up to Bernie Country ... I need to write u...

cfastie commented on Shallow note on depth almost 3 years ago

Don have you described somewhere how in the world this thing measures water depth? I need this an...

eustatic commented on [reference] "Carbon Bombs" or "Climate Bombs" --EcoFys analysis for Greenpeace almost 3 years ago

"Gulf of Mexico: plans for new deepwater oil drilling would produce 2.1 million barrels of oil a ...

donblair commented on Shallow note on depth almost 3 years ago

Hi @gretchengehrke :) I'd never really testing it very thoroughly, and I haven't done sufficient...

gretchengehrke commented on Shallow note on depth almost 3 years ago

Hey Don -- How well does the depth feature work? @stevie and I were just talking about it, and ar...

bortek commented on Plant health NDVI Red vs Blue filter almost 3 years ago

Thanks Clayton. I am on it now. :)

Claytonb commented on Plant health NDVI Red vs Blue filter almost 3 years ago

@bortek -the blue in the NDVI image is related to the value of the color LUT I applied to the ima...

bortek commented on Plant health NDVI Red vs Blue filter almost 3 years ago

@Claytonb - I am planning to start with a single camera and do some initial testing and learning ...

anjohn12 commented on Using the Spectroscope for Analysis of Concentration (Beer's Law) almost 3 years ago

Quick question, I'm trying to do something similar for a school project. Shouldn't the absorbance...

Rural commented on KAPvolution almost 3 years ago

Magic Lantern seems to run on the EOS M and has an intervalometer. I can't recommend Magic Lanter...

Claytonb commented on Plant health NDVI Red vs Blue filter almost 3 years ago

Here is a similar scene with the Event38 at about the same height. This is with f/4, exp 1/1250, ...

Claytonb commented on Plant health NDVI Red vs Blue filter almost 3 years ago

@bortek -I am assuming that the noise is partly due to the filter thickness and light requirement...

warren commented on 405nm LED vs Laser almost 3 years ago

Gretchen is a chemist, so I thought she could shed some light on our questions about overlap and ...

Rural commented on Mapping Rural Alberta's Wetlands almost 3 years ago

Ah! Found it. Thanks. The gear is a red-herring if you are looking to edit.

warren commented on 405nm LED vs Laser almost 3 years ago

@gretchengehrke, can you help us w excitation emission wavelength questions?

cfastie commented on Mapping Rural Alberta's Wetlands almost 3 years ago

You are overlooking something hidden. The edit button is in the "Follow" "Like" bar at upper righ...

Rural commented on Mapping Rural Alberta's Wetlands almost 3 years ago

Sure @stevie. With the expectation (and fear) that more people would see my post, I gave it anoth...

stevie commented on Mapping Rural Alberta's Wetlands almost 3 years ago

Awesome post @Rural! If it's alright with you I'd like to tag it to the blog!

bortek commented on Plant health NDVI Red vs Blue filter almost 3 years ago

This is really interesting. I have read Ned's article too and it is clearly better contrast when ...

Foldup Spectrometer for iPhone

by cfastie almost 6 years ago | 6 | | 0

New Raspberry PI open source guide

by gonzoearth almost 6 years ago | 0 | | 2

Popular Mechanics DIY Spec. article #2

by Shannon almost 6 years ago | 0 | | 2

my MacBook's webcam is

by MarthaV almost 6 years ago | 1 | | 0

I've built the spectrometer

by MarthaV almost 6 years ago | 2 | | 2

Delta Levitation with A-1200

by patcoyle almost 6 years ago | 1 | | 2

White light sources

by mcuman almost 6 years ago | 0 | | 2

Spectrometer calibration

by wiebew almost 6 years ago | 2 | | 3

Black image after assembly

by BrentNewhall almost 6 years ago | 6 | | 2

Tis the Season

by cfastie almost 6 years ago | 2 | | 1

NOLA.com article on Sulfur release to Chalmette

by eustatic almost 6 years ago | 0 | | 2

Kukui'ula Resort

by knygaard almost 6 years ago | 2 | | 2

Public Lab community newsletter 12.21.12

by Shannon almost 6 years ago | 0 | | 2

Spectrometers arriving: what next?

by warren almost 6 years ago | 0 | | 0

NIR Camera Calibration

by Babu almost 6 years ago | 13 | | 2

Calibration Pictures

by ckmurt almost 6 years ago | 14 | | 1

Portable Energy Scavenging Kit 0.1a

by donblair almost 6 years ago | 7 | | 0

Public Lab community newsletter 12.14.12

by Shannon about 6 years ago | 0 | | 0

Understanding the spectrum

by minot about 6 years ago | 1 | | 0

Massive updates to Spectral Workbench

by warren about 6 years ago | 1 | | 0




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