| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 » | 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 | |||
| 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 » | 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 | |||
| 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 » | over 8 years ago | |||
| warren | "What are the default units? I'm thinking about how the CSV will be uploaded and graphed. Looks great! " | 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 | |||
| 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 » | 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 | |||
| 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 » | 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 | |||
| 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 » | over 8 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 » | 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 | |||
| 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 » | over 8 years ago |