Anelok: rework plan, battery update, left-shift, Anelok in China

Spencer Young spencer at fabricatorz.com
Sat Feb 14 16:44:16 UTC 2015


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On Sat, Feb 14, 2015 at 8:35 AM, Werner Almesberger <werner at almesberger.net>
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
>
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