| 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 | "Hi @gretchengehrke! Sorry for the much-delayed reply :) and thanks for the comment. I, too, liked this approach -- basically, using the differenc..." | Read more » | over 6 years ago | |||
| donblair | "Hallo! If the hardware is Riffle version 0.1.8, the relevant schematic is here -- and, so far as I can tell, VBAT should simply be the battery inp..." | Read more » | over 6 years ago | |||
| donblair | "Hi Rebeccah! Fantastic stuff here. Lots to digest, and I have several thoughts -- but first, quickly: the frequency output of the Coqui requires..." | Read more » | over 7 years ago | |||
| donblair | "This is gorgeous! So cool! (Were you able to use the washer without bumping into any components on the board? Been worried bout whether using th..." | Read more » | almost 8 years ago | |||
| donblair | "Yay, data!! Neat observation about the battery voltage and the temperature. Makes me want to compare the rate of battery voltage drop to the temp..." | Read more » | almost 8 years ago | |||
| donblair | "Bravo!! This is amazing. This makes me wonder what accounts for the rest of that quiescent current draw ... maybe the majority of it is due to th..." | Read more » | almost 8 years ago | |||
| donblair | "This is so fantastic. So neat to see the current spikes with the SD card writes! ANd ... oh, my, what a terribly high sleeping current ... I sho..." | Read more » | almost 8 years ago | |||
| donblair | "Chris, This is such a beautiful project! The lapse rate calculation is so fun to see. Quick reactions: That power switch goof is annoying. I w..." | Read more » | almost 8 years ago | |||
| donblair | "Wow, great work. Sorry that there's so much trouble dealing with drivers for this USB-Serial chip! Re: the capacitive sensor circuit ... do you s..." | Read more » | almost 8 years ago | |||
| donblair | "@ggallant -- Wow, this is fantastic detective work. Does it seem that you were able to resolve the uC resetting issue with the extra cap parallel ..." | Read more » | almost 8 years ago | |||
| donblair | "Hi Chris! This is fantastic research. So many interesting questions coming up already via your testing. Thank you. Riffleman! These rechargeabl..." | Read more » | almost 8 years ago | |||
| donblair | "@cfastie: Power estimates are next on my list :) Looks like I should be able to switch off power to the camera completely using the microcontrolle..." | Read more » | about 8 years ago | |||
| donblair | "-- a CR1220 coin cell. " | Read more » | about 8 years ago | |||
| donblair | "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 » | about 8 years ago | |||
| donblair | "@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 » | about 8 years ago | |||
| donblair | "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 » | about 8 years ago | |||
| donblair | "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 » | about 8 years ago | |||
| donblair | "(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 » | about 8 years ago | |||
| donblair | "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 » | about 8 years ago | |||
| donblair | "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 » | about 8 years ago | |||
| donblair | "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 » | about 8 years ago | |||
| donblair | "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 » | about 8 years ago |