donblair 82 research notes and 758 wiki edits | Joined about 6 years ago | Moderator






Riffle-328p version 0.96 :)

by donblair about 4 years ago | 5 | 110 views | 3


Riffle & Coqui Development Plan

by donblair over 4 years ago | 0 | 56 views | 1


Shallow note on depth

by donblair over 4 years ago | 10 | 97 views | 1



Coqui PCB + audio jack

by donblair over 4 years ago | 0 | 1,533 views | 1




Coqui BBv1.0: Reacting to an LED with Sound

by donblair over 4 years ago | 0 | 100 views | 1




Build a Coqui BBv1.0

by donblair over 4 years ago | 8 | 791 views | 7


Duty Cycles & 555s --> linearity!

by donblair over 4 years ago | 16 | 324 views | 3


Water quality voicemails: Vojo & Coqui

by donblair over 4 years ago | 2 | 233 views | 6


EPA's Advanced Monitoring Tech Demo Day

by donblair almost 5 years ago | 11 | 199 views | 3


Research Note Workflows

by donblair almost 5 years ago | 43 | 123 views | 3


RIffle-ito and Thermistor Deployment

by donblair almost 5 years ago | 0 | 1,411 views | 1



Riffleito-TH

by donblair almost 5 years ago | 0 | 991 views | 0


Open Hour on Water Quality, Monday July 21, 8pm

by donblair almost 5 years ago | 5 | 138 views | 0


Recap: Open Water Workshop, 7/12/14

by donblair almost 5 years ago | 8 | 214 views | 8


How to download and analyze Landsat imagery

by donblair almost 5 years ago | 11 | 425 views | 4



Simple 555 conductivity meter

by donblair almost 5 years ago | 7 | 297 views | 5


Using an Audio Jack to Assess Conductivity

by donblair almost 5 years ago | 2 | 121 views | 1


View these maps at MapKnitter.org »

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Comments

Comment Last activity Moderation
"I need a little help understanding this background. When you modulate the LED at 1 kHz, that means it's flashing on and off 1000 times a second? E..." | Read more » about 3 years ago
"This is so great. Quick question: I could imagine extending the battery on a Mobius by controlling a USB power source with a switch: i.e., one c..." | Read more » about 3 years ago
"@pdhixenbaugh -- These are great ideas / questions / suggestions! I just posted a quick follow-up here: https://publiclab.org/notes/donblair/03-2..." | Read more » about 3 years ago
"-- a CR1220 coin cell. " | Read more » about 3 years ago
"Oh, exciting ... it'd be fun to demonstrate anything powered by moving water. Maybe this thingy should be ordered immediately. A visit ASAP sound..." | Read more » about 3 years ago
"Exactly. Was confusing for me, too, as I'd been nursing a rather fixed mental picture of a parallel plate capacitor with a dielectric slab sandwic..." | Read more » about 3 years ago
"This sounds like it might prompt a PVOS research trip up to Bernie Country ... I need to write up a research note, but here's the basic idea (cour..." | Read more » about 3 years ago
"Hi @gretchengehrke :) I'd never really testing it very thoroughly, and I haven't done sufficient background research to know if the 555 approach I..." | Read more » about 3 years ago
"Wow, amazing note. Thanks so much for putting all this so nicely together, @mathew!!! Still digging in, but quick thoughts: The 6-32 screws wit..." | Read more » over 3 years ago
"@pdhixenbaugh -- Good point! I do think the self-discharge rate on these various battery chemistries does differ, but I don't know by how much. Le..." | Read more » over 3 years ago
"Hey All! Okay, after a bunch of discussion last night, it seems that the above P-Mos circuit will work, but the battery leakage is significant. A..." | Read more » over 3 years ago
"Further elaboration on this circuit solution: The idea (nicely described in the blog post) is to use a P-channel Mosfet arranged so that when USB ..." | Read more » over 3 years ago
"(Also note: I've added an extra capacitor to the circuit, so that I'll have a 10uF close to the lithium charger, and on both sides of the LDO) " | Read more » over 3 years ago
"Okay, here's my interpretation of the more advanced circuit: Full schematic: Close-up on the relevant power circuitry: Load balancing is ac..." | Read more » over 3 years ago
"For further reference (both of the below pics are from the above-referenced blog post, the minimal schematic for the charger chip (which I'd been u..." | Read more » over 3 years ago
"Update: What I'd observed was that the previous version of the riffle -- 0.96 -- seemed to allow for USB programming even when a battery wasn't pl..." | Read more » over 3 years ago
"Update: I've attempted to incorporate both the fix to the switch, and the new diode-based power management strategy, in the Riffle 0.1.4 schematic..." | Read more » over 3 years ago
"Update -- based on some tinkering, and some great feedback from folks on the plots-waterquality google group: The power issues no longer seem myst..." | Read more » over 3 years ago
"Also need to add CERN open hardware license info to board artwork " | Read more » over 3 years ago
"Ah, yes -- just now seeing Mathew's email -- we should also put a grid of pinout artwork on the back, corresponding to the arrangement of the pins ..." | Read more » over 3 years ago
"Great to see the photos -- thanks for taking them so quickly! Quick items: Looks from the photo that the USB part did in fact stay within the ~ ..." | Read more » over 3 years ago
"Hey Liz! Wow -- this looks great! Since this research note was originally posted, there are a few insights that have emerged: Silicone doesn't ..." | Read more » over 3 years ago
"Hah, just saw that @mathew posted a link I was reading this morning, but forgot to include: http://www.electroschematics.com/6923/555-low-voltage-..." | Read more » over 3 years ago
"@pdhixenbaugh -- the latest version of the Riffle (Beta 0.1.1) will have two battery ports -- one for rechargeable Lipos, and one that can take in ..." | Read more » over 3 years ago



















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