Unsubscribe, please. On Sat, Feb 14, 2015 at 8:35 AM, Werner Almesberger <[email protected]> wrote:
> Just a few minor items for this week: > > - I made a plan for reworking existing Anelok boards to make the > whole system run at 3.3 V: > > > http://downloads.qi-hardware.com/people/werner/anelok/tmp/boost-rework.pdf > > More details: > > > https://gitorious.org/anelok/anelok/source/aeaccf8b538ae2f46c894dea5afe7037b7359ce6:doc/boost-rework/README > > This looks reasonably simple. Losing the Vsys pad isn't nice but > not really a problem at this stage. > > In the boost-rework branch, I changed the schematics and the layout > to reflect the modifications, and they still agree with each other. > I haven't actually implemented the rework yet, so there may still > be surprises, such as the idea not working at all. > > - meanwhile, the battery is busy discharging and has just passed the > 300 hours mark: > > > http://downloads.qi-hardware.com/people/werner/anelok/tmp/cr2032-300h.png > > Not sure if the slight drop towards the end is a first sign of > weakness or whether this merely reflects the cooler weather of the > last couple of days. We'll see next week or so. > > The effect of temperature is noteworthy. If we assume that the > difference between highs and lows is about 10 K, that would mean > a temperature coefficient of roughly 5 mV/K. > > This may not seem like much but the voltage change caused by a > temperature difference of 10 K would then be the same as that > caused by a current difference of 2.5 mA or 20+/-10% of the > expected idle current (display on, LED off, not doing much else). > > - items on the screen are now arranged in a more logical way in > left-handed mode. Here is an illustration: > > http://downloads.qi-hardware.com/people/werner/anelok/tmp/handed.pdf > > On top is the usual right-handed configuration. So far, switching > to left-handed simply rotated the entire screen content. This > caused the position marker (the little white blip) and the icon bar > to end up far from the finger, which looked a bit counter-intuitive. > > The bottom drawing shows what it looks like now: position marker > and icon bar get moved to the left and the main display area starts > after them. > > - last but not least, the folks at Canaan Creative (Xiangfu et al.) > have made a few Anelok boards. Some first impressions: > > > http://downloads.qi-hardware.com/people/xiangfu/anelok/tmp/brd-with-UBB-front.jpg > > http://downloads.qi-hardware.com/people/xiangfu/anelok/tmp/brd-with-UBB-back.jpg > > http://downloads.qi-hardware.com/people/xiangfu/anelok/tmp/Anelok-booting.jpg > > Looking great ! Plus, it proves that the available design information > is sufficient to build working devices from it, i.e., that I didn't > hold back or simply forget something. > > - 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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