Thanks. I do remember a discussion of two-MCU approach, was not sure where you landed. (Solid decision IMO.)
The new case design looks attractive to me. When you are ready, I have a long time friend who is a first-class mechanical designer. I'm sure that over a beer or three he would at least comment. He's a Solidworks guru. Not sure what a path from your design --> exported to solidworks might look like. I realize you'd want to return design to open source tools. But if (BIG "If") my buddy would work on the mechanical design for some (undefined..., TBD) incentive... he might be able to help with a 3D printed case approach for low quantity. Naturally any real volume will require a mold, but a so called soft mold (low volume) might not be that bad when the designer knows all the rules. Just ideas. No commitments. D'oh. ron j --- Ron K. Jeffries 805-567-4670 On Tue, May 19, 2015 at 3:16 PM, Werner Almesberger <[email protected]> wrote: > Ron K. Jeffries wrote: > > My sense is you are close to a decision that CR2032 will not support > anelok > > operation for a long enough period of elapsed calendar time. > > The main problem I found with CR2032 is that it can't support the peak > current Anelok needs, especially when using memory cards. So yes, my > plan is to eventually switch to AAA. > > Here is the updated hardware evolution diagram: > > > http://downloads.qi-hardware.com/people/werner/anelok/tmp/evol-hw-201505.pdf > > I also changed the MCU from KL26 to KL26 + KL16, as discussed before > > http://lists.en.qi-hardware.com/pipermail/discussion/2014-December/010738.html > > http://lists.en.qi-hardware.com/pipermail/discussion/2014-December/010739.html > > > Have you considered a case mod that would allow say 2xAAA batteries? > > Actually, I just tried to see what it may look like. One AAA should > be plenty. Here is an early design study: > > > http://downloads.qi-hardware.com/people/werner/anelok/tmp/case-aaa-study.png > > The device would be held as shown: the thick end with the battery > at the bottom, the thinner end up. USB and rfkill would be on the > right side, the antenna on the left side. The slider is also on the > right side, above the main PCB. > > This hypothetical case would have a footprint of about 50 x 40 mm and > a height between 9 and 14 mm. So the volume would be roughly 23 ccm, > 12% more than the current case with 67 x 34 x 9 mm = 20.5 ccm. > > The main PCB in this design would be only about 45 x 24 = 1080 mm^2, > i.e., almost 20% smaller than the existing PCB with 42 x 31 = 1302 mm^2. > Such a small PCB probably means the end of in-my-kitchen DIY. > > There are still numerous unresolved issues: > > - what would the battery contacts look like and how would they connect > to the PCB ? > - how is the battery accessed and would that still allow the memory > card to eject into the battery compartment ? > - is there enough clearance for the antenna to perform properly ? > - is the area for the slider large enough ? (As shown, it's a bit > smaller than in the current design.) > - will left-handed users find the device usable in this shape ? > - is there enough room for all the support structures and such ? > - how to actually make this case ? > and so on. > > - Werner > > _______________________________________________ > Qi Hardware Discussion List > Mail to list (members only): [email protected] > Subscribe or Unsubscribe: > http://lists.en.qi-hardware.com/mailman/listinfo/discussion >
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