donblair 82 research notes and 700 wiki edits | Joined about 6 years ago | Moderator






Simple 555 conductivity meter

by donblair almost 5 years ago | 7 | 4,124 views | 4


Using an Audio Jack to Assess Conductivity

by donblair almost 5 years ago | 2 | 2,752 views | 1


"Underwater LEDz" -- first test

by donblair almost 5 years ago | 2 | 1,320 views | 0


Science for the People

by donblair almost 5 years ago | 0 | 1,256 views | 3



Riffle dev: 'Fun w/ Five-Five-Fives'

by donblair almost 5 years ago | 12 | 3,260 views | 1



How do we measure particulate stuff in the air?

by donblair about 5 years ago | 10 | 5,613 views | 3


Preliminary PCBs for Particulates

by donblair about 5 years ago | 7 | 3,542 views | 2




Open-Lux REV-N: Full Circle

by donblair about 5 years ago | 3 | 4,381 views | 1


Open-Lux REV-F: "NeoPixel" Fiesta!

by donblair about 5 years ago | 3 | 3,234 views | 1



RIFFLE: Conductivity + Adhesive updates

by donblair about 5 years ago | 11 | 2,771 views | 0


Comparisons: Canons, Mobiuses, 'fruit

by donblair about 5 years ago | 2 | 1,176 views | 0



Open-Lux

by donblair about 5 years ago | 2 | 3,642 views | 2


Thermal Flashlight REVA -- first tests

by donblair about 5 years ago | 0 | 2,447 views | 3


Thermal flashlight REVA -- mostly built!

by donblair about 5 years ago | 0 | 2,257 views | 2


Preliminary Plymouth Plant Plume Ponderings

by donblair about 5 years ago | 8 | 4,392 views | 2


Thermal flashlight -- now with more LEDz!

by donblair over 5 years ago | 1 | 2,783 views | 2


Public Lab Mascot Tryouts

by donblair over 5 years ago | 2 | 1,543 views | 0



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Comments

Comment Last activity Moderation
"Ah, great -- yes, that's what seems most sensible to me, too. TMI: By frequency I meant the "555 timer output frequency" for the conductivity rea..." | Read more » over 3 years ago
"The basic trade-off I see is that: it's actually a pain to reprogram the device with calibration corrections every time you do calibration, even t..." | Read more » over 3 years ago
"Great point! @warren and @gretchengehrke Need to figure out those default units. Was actually just musing about that, and wrote this: https://pub..." | Read more » over 3 years ago
"To be more specific ... The goal is for the microcontroller (uC) brain (Atmel 328p), and the sensor boards it connects to, to be running at 3.3V. ..." | Read more » over 3 years ago
"Thanks @danbeavers! The PDF you just linked to seems empty -- if you get a chance, could you link to a URL with the part? I have share your feeli..." | Read more » over 3 years ago
"Ah, okay, issue: I can drop the charging chip; but currently the charging chip performs a useful additional function: it allows voltage to be com..." | Read more » over 3 years ago
"Oh, and @warren & @tonyc -- so some notches on the edges of the board, yeah? Will play with the idea ... " | Read more » over 3 years ago
"connector Aj, cool ideas @warren and @tonyc! Also: I just heard back from MacroFab -- they can do through-hole soldering for a little more (per ..." | Read more » over 3 years ago
"My impression, from what I've heard, read, is that it's a bad idea to use SMT components when there is any regular mechanical stress expected. Cf...." | Read more » over 3 years ago
"I don't know if this part can be placed by a pick-and-place, but if it can, might be worth trying -- the double row SMT pads might make it sufficie..." | Read more » over 3 years ago
"Receptacle side ... http://www.digikey.com/product-detail/en/610114249221/732-6081-2-ND/5047736 Hmm, maybe we can get away with no soldering requi..." | Read more » over 3 years ago
"male side ... http://www.digikey.com/product-detail/en/610114249121/732-6071-2-ND/5047735 " | Read more » over 3 years ago
"oh, interesting ... i don't know how mechanically stable these will be, but: " | Read more » over 3 years ago
"@warren -- wow, that Pocket Operator looks so cool. It makes me wonder if there are AA battery holders like the one they used with the metal clips..." | Read more » over 3 years ago
"Wow, so many good thoughts .... soldering & accessibility It's a good point that it'd be nice for the kit to be useful without requiring any ..." | Read more » over 3 years ago
"Apparently the "change" code is already part of the Arduino base code ... http://playground.arduino.cc/Main/PinChangeInt I might try this example..." | Read more » over 3 years ago
"Fantastic -- thanks @SteveHicks! Ah, I see the source of my confusion. I was reading the explanation here: https://www.arduino.cc/en/Reference/A..." | Read more » over 3 years ago
"Thanks, @cfastie! Background Automated dispensing cabinets were introduced in the late 1980s, and allow for decentralized, automated distribution ..." | Read more » over 3 years ago
"Note: regarding the RTC wakeup functionality, I posted some thoughts here: https://publiclab.org/notes/donblair/12-02-2015/random-bits-atmel-low-p..." | Read more » over 3 years ago
"Thanks @warren re: Semver -- that looks like just the sort of guidance I was looking for! @tonyc -- I was thinking about this issue ... one of the..." | Read more » over 3 years ago
"Wow, such a clever demonstration! Makes me wonder, as an aside, if we could simply stick a piece of filter in front of these sensors before puttin..." | Read more » over 3 years ago
"Yes, nice! In the picture, it looks like one could place a little cuvette right there in the middle and assess the turbidity :) " | Read more » over 3 years ago
"Update: just figured out that cloud 9 is intended for development-only -- the free service stops running after 2 days :) I'm now experimenting wit..." | Read more » over 3 years ago
"whaddya think? " | Read more » over 3 years ago

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