A few months ago, Nike+ web site warned me to change my Nike+ Sensor because it was under 2% of power. It would be possible to built in this site a kind of "Sensor Tracker" or something that tell you that it's time to change your Sensor ?
Nike+ Sensor Tracker
(9 posts)-
Posted 1 year ago #
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I kind of sort of have that data. But I am still not sure how to interpret it. If you go to your run list and click on the Raw XML data link at the top for a couple of your latest runs, then look for a field called *batteryLifetime* in the data. You might need to do a View-Source to see it in your browser. You will see a number there that changes for each run. I asked Nike long ago what that number was supposed to mean, but they didn't answer. I also wasn't able to determine a pattern. It seems to go up semi-randomly. For example, for my last 10 runs I get:
April 23: 279
April 21: 276
April 20: 275
April 19: 274
April 18: 273
April 17: 271
April 16: 269
April 15: 268
April 14: 267
April 13: 263Now, my guess is that it is the number of days the sensor has been active, but what is the upper limit? I see people whose sensors have lasted for 3+ years and this number appears to stop at 2047. There obviously aren't 2047 days in 3 years, so.. For example:
His first run with that sensor was on 2007-12-15 and he has run 1186km with it.
Then there is someone like:
His sensor battery for his latest run says 1881. But he has only run 182 miles since 2010-01-02 with that sensor.
I'm at 279 on my sensor, and I have run 2031km since 2009-02-12.
And http://slowgeek.com/pr/282997672
He has 9403km on his current sensor across 996 runs starting on 2008-06-05. His Battery Lifetime reading from his run yesterday? 972
So, I have no idea what to do with those numbers. When Nike warned you that you were under 2%, did you change your sensor or did you keep using it until it died? I would be interested to hear if it actually did die shortly after you got that warning. Like so many Nike things, I fear this number and the associated warnings (assuming they are based on this number) are rather random.
Posted 1 year ago # -
Despite de Nike warning, I keept using my old sensor until it died a couple of runs later. My last run with it was on Sep 16th 2009 , I remember that because on my next run on Sep 21th 2009 I forgot to introduce my weight data on my Ipod and then I burned 0 Cal.
Posted 1 year ago # -
Right, so your battery lifetime said 1152 on that last run on Sept.16. So your sensor lasted for only 57 runs for a total of 277km starting on 2009-01-10 and ending on 2009-09-16. That's way less than most of the active sensors right now. So there must be some other indicator in the data that Nike isn't sending back out. I'll take a look at my raw (off my ipod) run data later to see if it is there. Even if it is, since Nike isn't sending it back out, there isn't anything I can do to show it.
Posted 1 year ago # -
huh. My "batteryLifetime" has read "0" from the start. No warnings yet; I'll just keep using it 'til it dies.
Posted 1 year ago # -
I don't believe the number of runs is relevant to battery life of the sensor. It is my understanding the sensors goes to sleep between runs and wakes up with movement. While it is "awake" it will be transmitting data and as such using up the battery. So battery life will be most influences by the amount of time it is awake which will be pretty close to total run time. Of course, the battery isn't perfect and will lose some charge even when "asleep". To add to the complexity, there will be a certain amount of time before and after a run where the sensor is transmitting but you aren't recording time. Another thing would be variation in the actual batteries themselves and temperatures under which they were used. Bottom line is I don't think it would be possible to come up with a sensor tracker.
I was reading up on the sensors recently (I'll try to find the Nike+ FAQ that mentioned it) and if remember correctly, the sensor sends out a low battery warning once the charge falls below a certain threshold. The low battery is meant to be indicated on the iPod screen (at least for iPod Touch) and I suspect it sends something along with the data (although I couldn't see anything in Jovisaru's data).
Posted 1 year ago # -
Just a detail about my Nike+ Hardware History:
4H7341B4VSX 2007-09-20 2008-12-30 540km iPod
4H647A5KVSX 2009-01-10 2009-09-16 277km iPod
4H9270TVVSX 2009-09-21 2010-04-23 267km iPodif I remember right, on 2009-01-10 I only changed my old receiver because it broke down and I keept using my old Sensor. So I made 540 + 277 km with the old Sensor.
Posted 1 year ago # -
The receiver doesn't matter. The 4H... id is the Emped ID which is the sensor id. You must be on your third sensor.
Posted 1 year ago # -
The batteryLifetime number is probably the number of times the sensor has awoken from sleep mode. But since there is nothing that says how long it was awake for, it isn't a a very useful number.
Posted 1 year ago #
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