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mathew "+1 to not putting units on the CSV file. The 'signal' that this data needs further work/calibration is important and I think well articulated her..." | Read more » almost 7 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 » almost 7 years ago
gretchengehrke "Hi Don, I was assuming the output would be in frequency for both, but there would be an algorithm before the graphing step to do a unit conversion,..." | Read more » almost 7 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 » almost 7 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 » almost 7 years ago
gretchengehrke "Looks great! Two thoughts: (1) definitely important comment by Jeff about units and potentially a post-data-retrieval function for units conversio..." | Read more » almost 7 years ago
warren "What are the default units? I'm thinking about how the CSV will be uploaded and graphed. Looks great! " | Read more » almost 7 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 » almost 7 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 » almost 7 years ago
danbeavers "The surface mount connector has plastic pins protruding on the bottom to help with mechanical rigidity. SMconnectorF.pdf Click on the box in the..." | Read more » almost 7 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 » almost 7 years ago
tonyc "I support the idea of giving up recharging in order to handle more types of batteries. That seems a higher likelihood use case. We could offer the ..." | Read more » almost 7 years ago
donblair "Oh, and @warren & @tonyc -- so some notches on the edges of the board, yeah? Will play with the idea ... " | Read more » almost 7 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 » almost 7 years ago
tonyc "Those recesses look like the ones I was reqeusting for the zip-tie mounting idea. should be simple manufacturing-wise, and if we had recess on fron..." | Read more » almost 7 years ago
warren "I wonder if the connector were recessed from the edge of the board, and perhaps wrapped around some kind of supporting shape of the board itself? I..." | Read more » almost 7 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 » about 7 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 » about 7 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 » about 7 years ago
donblair "male side ... http://www.digikey.com/product-detail/en/610114249121/732-6071-2-ND/5047735 " | Read more » about 7 years ago
donblair "oh, interesting ... i don't know how mechanically stable these will be, but: " | Read more » about 7 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 » about 7 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 » about 7 years ago
pdhixenbaugh "Exciting stuff! I'd second the easy AA battery option. I can solder at a basic level, but the less it's required, the less it can go wrong. I don'..." | Read more » about 7 years ago