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
