Comments

Author Comment Last activity Moderation
donblair "Great question re: whether powering the Feather on the 3V line really does work well ... I don't really know. But: looking at a schematic for one ..." | Read more » over 6 years ago
donblair "Thanks Chris -- this is incredibly useful. So important for folks to have a sense of the trade-offs and considerations when choosing solutions in ..." | Read more » over 6 years ago
donblair "-- a CR1220 coin cell. " | Read more » over 8 years ago
donblair "@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 8 years ago
donblair "Oh gosh -- Chris, thanks for tagging me in this thread -- I had no idea that this existed! Wow, Ed -- what amazing work you've been doing!! It's ..." | Read more » over 8 years ago
donblair "Note: fixed the broken link to the riffle datalogger, above. Cheers! " | Read more » over 8 years ago
donblair "@mathew -- great stuff! I really like the stud ring + nut replacement for the alligator clips. More secure, and likely available at a typical hard..." | Read more » over 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "Oh, and @warren & @tonyc -- so some notches on the edges of the board, yeah? Will play with the idea ... " | Read more » over 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "male side ... http://www.digikey.com/product-detail/en/610114249121/732-6071-2-ND/5047735 " | Read more » over 8 years ago
donblair "oh, interesting ... i don't know how mechanically stable these will be, but: " | Read more » over 8 years ago
donblair "@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 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago
donblair "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 8 years ago