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donblair 647 research notes and wiki edits | Moderator



Sync-mod for ambient background removal -- first tests

by donblair 6 months ago | 0 | 430 | 2

This is a quick follow-up to the idea posted here. The idea in that note was that by adding a pu...

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TTL Serial JPEG Cameras + microcontrollers

by donblair 6 months ago | 6 | 831 | 3

Just seeing @tonyc 's recent note on using a Mobius camera for field time lapse -- great stuff! ...

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Removing ambient interference from turbidity measurements through signal modulation

by donblair 7 months ago | 6 | 1,605 | 3

Turbidity is an optical measurement of suspended solids in solution -- a broadly useful water qua...

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Riffle 0.1.1 Debugging

by donblair 8 months ago | 10 | 1,743 | 1

Hi All, Just got back the latest version of the Riffle 0.1.1 board, nicely assembled by the kind...

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Conductivity Sensing: Open Questions

by donblair 9 months ago | 4 | 1,156 | 7

Design Goals A lot of people are interested in measuring conductivity in liquids -- because it p...

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Universal Hardware Registry?

by donblair 10 months ago | 5 | 664 | 1

Hi all! [WARNING: this idea is not fully thought through. Would love your thoughts!] Motivation...

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Riffle CT (Conductivity & Temp) Beta Design: Electronics, Enclosure, Probes, Data Collection

by donblair 10 months ago | 16 | 1,488 | 2

Hi All, For our "Beta Release" of the Riffle datalogger hardware, we're focusing on a particular...

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Riffle Beta Release: Feature Freeze this Friday! (12/11)

by donblair 10 months ago | 3 | 949 | 4

Thank you for the feedback! Thanks so much to everyone for all the fantastic comments on the ear...

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Random Bits: Atmel Low Power Libraries & RTC wakeup

by donblair 10 months ago | 6 | 1,825 | 1

Quick notes from the last several days -- sorry it'll be a bit of a ramble -- just trying to capt...

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Turbidity Notes: Absorption Spectrum of Liquid Water

by donblair 10 months ago | 3 | 1,514 | 1

Source: https://upload.wikimedia.org/wikipedia/commons/1/18/Absorption_spectrum_of_liquid_water...

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Riffle Beta Release: Feature Requests / Review?

by donblair 10 months ago | 25 | 2,208 | 3

Hi All! We're wrapping up a bunch of conversations about the design of the board, in order get a...

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Testing a Phant Data Repository on Cloud9

by donblair 11 months ago | 1 | 881 | 2

[Edit 11/8: an earlier title for this was "Your Own Data Repository on Cloud9" -- but I've since ...

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Riffle: one-sided pcb w/ breakaway mounting tabs

by donblair 11 months ago | 10 | 2,072 | 1

all surface mount components are on one side length of riffle board is now 100 mm (3.94 inches) ...

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Turbidity sensor prototype

by donblair 11 months ago | 4 | 2,516 | 5

Surrounded by friends who were putting together Dracula, Zombie, and etc equipment, I decided to:...

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Riffle Water Bottle Enclosure: rubber stopper w/hole + silicone sealant: > 8 weeks!

by donblair 11 months ago | 6 | 2,451 | 3

[photo credit: Liz Barry. Shocked cereal box credit: D'Ignazio family] We've been experimenting...

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Using a Cellular Modem to post directly to the web & track location

by donblair 11 months ago | 1 | 1,156 | 3

Hi Folks! More on this soon, but wanted to post a quick note on this code, in case it's helpful ...

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Monongahela Monitoring Marathon - Part I

by donblair 12 months ago | 1 | 956 | 1

Hello again! This is just a quick research note in an attempt to catch up with John Keefe's amaz...

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Suratá Visible -- Part I

by donblair 12 months ago | 2 | 1,234 | 2

Hallo! This is a long overdue first post on an amazing project that I participated in towards th...

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Rubba Stoppaz

by donblair about 1 year ago | 8 | 2,504 | 3

Finally getting around to testing @mathew 's clever ideas around sealing up plastic water bottles...

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Riffle: sensor board approach

by donblair about 1 year ago | 6 | 2,457 | 3

One idea that came up in Colombia (and, really, in various forms earlier, at LEAFFEST and elsewhe...

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Riffle Datalogger: quick development snapshot

by donblair about 1 year ago | 1 | 2,085 | 1

Background This is an attempt to take a quick snapshot of the Riffle open hardware water monitor...

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Wireless 001

by donblair about 1 year ago | 4 | 1,949 | 1

[header image from dev.physicslab.org] Background A first pass on notes re: various options for...

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Dock Test!

by donblair about 1 year ago | 0 | 1,583 | 6

Today Laura Perovich led Joe Goldbeck and me on an expedition to the Charles River to deploy a te...

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Turbidity 001

by donblair about 1 year ago | 4 | 2,582 | 2

Just wanted to gather some useful materials around turbidity -- how it's usually assessed, and va...

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Riffle-328p version 0.96 :)

by donblair over 1 year ago | 5 | 2,890 | 3

Quick update on the latest design for the Riffle ... But first, a quick review: Several of us h...

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Riffle & Coqui Development Plan

by donblair over 1 year ago | 0 | 1,819 | 1

(This is just a sketch re: what the Coqui and Riffle are intended to do, and how to develop them ...

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Shallow note on depth

by donblair over 1 year ago | 10 | 1,227 | 0

This is just to hold some pics for now ... more deets later!

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"Less is more: The Role of Small Data in 21st Century Governance."

by donblair almost 2 years ago | 2 | 2,465 | 2

A few months back, Diego Rafael Canabarro had graciously invited Catherine D'Ignazio, Jeff Warren...

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Coqui PCB + audio jack

by donblair almost 2 years ago | 0 | 1,386 | 1

https://github.com/OpenWaterProject/coqui

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Making a DIY conductivity probe from a water bottle and metal screws

by donblair almost 2 years ago | 6 | 4,380 | 2

Creating a conductivity probe:

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