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Co-founder of public lab, balloon and kite nut. mdml.co/ @headfullofair


mathew was awarded the Watchdog Barnstar by amysoyka for their work published in Frac Sand in 10 minutes.


mathew was awarded the Photo Documentation Barnstar by amysoyka for their work published in a paper spectrometer design.


mathew was awarded the Basic Barnstar by Francis for their work published in a paper spectrometer design, pt 2.


mathew was awarded the Video Documentation Barnstar by amysoyka for their work published in CSI: Creek Scene Investigators -public lab tv-.


sensors in soda bottles

by mathew | 7 days ago | 4 | 290 views | 2

What I want to do I want to keep electronics dry while wired to underwater sensors. I did a sho...

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housing water-quality water open-water


dealing with patents: Black & Decker and the Thermal Flashlight

by mathew | about 1 month ago | 6 | 387 views | 4

Update: actually, Black & Decker came up with this idea first and we just hadn't seen the thi...

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thermal-photography thermal-flashlight thermal-camera question:patent


shortlinks: putting contributors directly on a kit

by mathew | about 1 month ago | 2 | 505 views | 2

What I want to do I want to help users of Public Lab kits understand community research that goe...

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spectrometer community oil spectrometry


sketching a waterproof pop bottle sensor system

by mathew | about 1 month ago | 4 | 592 views | 0

What I want to do I want to make a way to reliably put sensors through the cap of a PET bottle. ...

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housing water-quality open-water openwater



CSI: Creek Scene Investigators -public lab tv-

by mathew | 3 months ago | 4 | 1,207 views | 2

Public Lab TV starring @Eymund of the Gowanus Conservancy. Eymund explains how to find the chalk ...

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water creek tv openwater


a paper spectrometer design, pt 2

by mathew | 3 months ago | 11 | 1,600 views | 3

What I want to do This is a substantial revision to an earlier design, which integrated a bunch ...

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spectrometer oil oil-spill-toolkit spectrometry


A DIY gas-finding camera?

by mathew | 3 months ago | 10 | 850 views | 1

What I want to do Explore whether its possible to make a camera that can see VOCs, like the very...

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infrared camera


a paper spectrometer design

by mathew | 4 months ago | 7 | 1,218 views | 3

What I want to do build a spectrometer that doesn't use a conduit box, out of mostly paper and c...

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spectrometer desktop-spectrometer fold-up dsk



notes on setting up a Dustduino

by mathew | 4 months ago | 1 | 591 views | 2

What I want to do setup a Dustduino per Matthew @Schoyer's instructions My attempt and results ...

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air-quality dustduino dust silica


Frac Sand in 10 minutes

by mathew | 4 months ago | 7 | 975 views | 6

photo credit: Crispin Pierce PhD What I want to do I made a 10 minute video introducing what fr...

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air-quality air monitoring dust


shorter spectrometer geometry with two slits?

by mathew | 5 months ago | 3 | 844 views | 2

What I want to do answer two questions: Can straylight be eliminated in a simple spectrometer se...

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spectrometer oil-testing-kit


Graded oils using UV fluorescence

by mathew | 5 months ago | 22 | 1,081 views | 1

What we want to do Me and @Warren are trying to replicate the heavy to light sorting of oils, a...

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spectrometer oil fluorescence spectral-workbench



Replicating the Grading of oils with UV Fluorescence on other cameras pt 1

by mathew | 5 months ago | 4 | 647 views | 0

What I want to do replicate the results of my previous note using different other cameras. I wa...

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spectrometer fluorescence oil-testing-kit 405nm


Grading oils with UV fluorescence

by mathew | 6 months ago | 5 | 621 views | 0

What I want to do I want to be able to grade oils from light to heavy. I'm going to use a means ...

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spectrometer laser fluorescence crude


Laser Pointers and the LIF Literature

by mathew | 6 months ago | 1 | 953 views | 1

*LIF stands for Laser Induced Fluorescence. What I want to do I want to answer three questions ...

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spectrometer uv laser fluorescence


Fluorescence spectroscopy with the foldup + gelcap

by mathew | 6 months ago | 4 | 605 views | 1

What I want to do See bright fluorescence spectra with a fold up. My attempt and results While...

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spectrometer uv fluorescence fold-up



Using Gelatin Caps for oil fluorescence

by mathew | 6 months ago | 19 | 1,136 views | 2

What I want to do see if we use gelatin caps as sample containers. They cost a few cents each, ...

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spectrometer oil fluorescence cuvette


Getting a high altitude balloon back

by mathew | 6 months ago | 4 | 679 views | 0

What I want to do fly a high altitude balloon and get it back. This means tracking where it goe...

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balloon-mapping solar-balloon mapping balloon


Clips for the next spectrometer, pt 2

by mathew | 6 months ago | 3 | 781 views | 1

What I want to do try out some clips I bought and figure how they fit in a new spectrometer desi...

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spectrometer oil-testing-kit


Low-cost passive aerosol monitors

by mathew | 7 months ago | 4 | 972 views | 1

What I want to do Summarize the literature on low-cost passive particle monitors tha can produce...

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air-quality dust particulates silica



Clips for the next spectrometer

by mathew | 7 months ago | 4 | 714 views | 1

What I want to do find and test a clip that works with the bench design @warren and I brainstorm...

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spectrometer oil-testing-kit


State of the Science: The Oil Testing Kit

by mathew | 7 months ago | 3 | 1,041 views | 3

What we want to do I sat down with @warren to record a video presentation on the state of the oi...

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spectrometer video oil-testing-kit with:warren


Karen's comments on the spectrometer instructions

by mathew | 7 months ago | 1 | 625 views | 0

Karen assembled a desktop spectrometer and commented the instructions during our 7/31 workshop.

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spectrometer assembly desktop-spectrometer desktop-spectrometer-assembly


Hardware design work for the Oil Testing Kit

by mathew | 7 months ago | 13 | 988 views | 2

A hardware sketch of our favorite configuration is above. _This is a jointly authored research no...

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spectrometer kits fluorescence desktop-spectrometer



A Retrospective of Spectrometer Design Ideas 2011-2014

by mathew | 8 months ago | 0 | 1,325 views | 0

Here is a history of public lab spectrometer research ideas up to the present. There is really n...

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spectrometer overview retrospective


Off-wind kite flying & Redstone Rigging in Augusta, WI

by mathew | 8 months ago | 5 | 1,525 views | 2

Dogs are totally pro-kite. Stephanie, Tom, myself, and our entranced canine audience. All groun...

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kite-mapping mapping wisconsin silica


DIY dust monitoring: Dylos in Wisconsin

by mathew | 9 months ago | 7 | 1,008 views | 1

Hank Boschen and Concerned Chippewa Citizen have been deploying ~$200 Dylos 1100 laser particula...

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wisconsin dust silica midwest


a first look at dust with consumer scanners

by mathew | 9 months ago | 7 | 783 views | 1

What I want to do See if I can't see PM10 or even PM2.5 particles on a consumer scanner. I purc...

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silica pm midwest particle-sensing



Using Fluxtream to look at Speck Data

by mathew | 9 months ago | 1 | 721 views | 1

What I want to do Document how to upload data from a Speck to CMU's analysis program Fluxtream.o...

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visualization data dust silica


The development of stickypad monitoring

by mathew | 9 months ago | 3 | 807 views | 2

What I want to do Summarize the development of sticky pads for dust monitoring and collect the p...

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air dust silica midwest