Michel,
Hi. I'd like to clear up a couple things that you don't seem to
understand about my Nixie watch design.
On 1/28/12 10:25 PM, Cobra007 wrote:
Hello David,
...
I have seen you used some open source software in your watch, that is
however not the most efficient way of software watch design.
I do not know what you mean by this. I wrote the software myself, then
published it under the GPL. That is why it is open source - I opened it
myself.
Have you read my watch code? It's as efficient as I could make it. Feel
free to point out anything in the code that seems wasteful to you.
If someone would occasionally wear the watch, it would still drain the
battery, no matter what. One battery will last for about 7 years if my
watch is worn only 1 day per week and will last at least one year with
daily usage.
I'd be interested in seeing your cell life calculations, since you make
a big deal of how much more efficient your circuit is.
My 16LF722 processor draws about 10 uA while running at 32 kHz, and the
ADXL335 accelerometer draws 350 uA for about 1.5 msec, activated 5 times
a second, for an average current of 2.6 uA. That 13 uA average current
draw would use up the 750mAH CR2 cell in 7 years, except that the cell
will drain itself in about 7 years. So to be realistic, I expect the
cell to last 3-4 years without viewing.
The HV power supply uses about 200 mA to light the tubes, which are lit
for two seconds per viewing. This gives power for 6750 viewings, which
is four months at 50 viewings per day. That's more than one viewing per
hour. After all, how can a person resist reading their Nixie watch over
and over again?
I have lost track of how long the battery in my watch lasts. I just grab
a cell from the drawer of cells that I keep on hand to test watches
before shipment, so I never know how fresh the cell that I just put in
my watch really is. Perhaps some of my customers could chime in.
--
David Forbes, Tucson AZ
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