Hi Peter, No, I don't have anything to send BlueTooth to the device other than my computer, which is not going paddling. The software will accept Bluetooth input from a heart rate monitor, but only one model as it is interfaced to it's output stream. I guess XML has not arrived on the scene yet. ;-> The take-away point from that is if there were a BlueTooth data stream available someone could write code to grab it an I would think log it along with the accelerometer data. Today I went looking and I have found several other free apps that will plot and log the accelerometer data. One converts to m/s^2 and logs that value. I can create a log with timestamps in ms from Jan 1, 1970 so it should be easy to correlate multiple logs provided they have their clocks set the same and/or as you suggest there is some sync pulse. It might work to strap the device to the paddle shaft and swing the paddle around a couple times then move the device to it's logging position for the trials. Sadly, these later apps require post processing. I would like to have a display that would give me instant feedback (that I could see in the sunlight) of the effect of my strokes. I'm thinking that a ten second integration might be good to allow me to alter some aspect of my stroke and see what effect that has on the boat speed. The key is accuracy. GPS speed is quick enough but not precise enough to know if the change is me or just noise. I think gathering the data is quite possible given these tools, and the challenge will be knowing what data corresponds to what changes in form or other application of the paddle to the water. There are two approaches that might have merit for different purposes. Prerecorded instructions to the paddler and live recording of paddler audio. I've tested both of these techniques sitting here in my office and the device seems to handle both of them just fine. One thing I don't know, is if the logged values are instantaneous acceleration values or averages for the time interval. If it were averaged then it would be more useful for positional calculations, but I expect it is instantaneous, and average acceleration will have to be assumed, which is OK if the sample rate is high enough compared to the acceleration of the vehicle. The mp3 player comes with the device. Here are links to the apps I'm looking at. No connection to any of them other than I'm trying them out: Auto mic gain audio recorder: http://tapemachine.samalyse.com/ Accelerometer logs: http://www.androlib.com/android.application.org-nargila-robostroke-android-app-jzCFp.aspx http://www.androlib.com/android.application.pt-acoelhosantos-android-acc-nFwm.aspx http://www.androlib.com/android.application.com-freshprogramming-sensortive-xDwB.aspx http://www.androlib.com/android.application.com-ohisamallc-ohiapp29-jwDCF.aspx http://www.androlib.com/android.application.abs-sensor-ADpA.aspx I probably won't go paddling to try these ideas until Thursday (GMT -4) and will continue to think about the issues and/or play with spreadsheets to convert the data into speed values or other relative numbers that could be used to compare techniques for better or for worse. As in any other investigation, it's important to know what one is try to achieve, and in my case I would like to know what is my most efficient paddle stroke for A) steady state cruise, and B) burst acceleration. Carey *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
Carey wrote: ...................I've uploaded some of the data I collected today to Box.net and sent you an invite to share the folder.................................. G'Day Thanks Carey your paddling data came through nicely and I'll start working through it on Saturday. All the best, PeterO *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
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