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Thread: Breathalyzer for smartphone:

  1. #61
    Insider
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    Sorry was busy having a kid.
    Congrats! How many for ya? Boy-Girl? (We have...6)

    Brief update, 99% of the MCU/RF stuff I needed to proceed arrived last night
    Sweet!

    Edit: Just saw this: http://www.gizmag.com/arduino-compat...osystem/27007/
    Last edited by pbjosh; 04-16-2013 at 08:17 AM.

  2. #62
    Could the BB chrono sense the ball speed by reading it through the barrel porting rather then mounting it in front of the barrel? Of course that assumes that two rows of porting are opposite of each other....

  3. #63
    Insider bronc's Avatar
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    We had a little boy. I don't think I've slept in over a week, but I guess that comes as part of the package

    So anyone have a good EE that want to work on this stuff? For free?

  4. #64
    Insider new ion?'s Avatar
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    I'm just an EE student... but I'd be more than happy to attempt!

  5. #65
    Insider
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    Can't edit my post (grumble grumble), and can't PM Simon to edit it, but I moved the test recording for the sonic chrony idea.
    http://soundcloud.com/neftalydotcom/sonic_chrony

  6. #66
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    I now have the Arduinos talking in a tree network. Haven't managed to get the Nordic SOC's going at all, unfortunately. Ordered some wider tube to make slip-on devices.

  7. #67
    it should come with a ticket and jail time calculator

  8. #68
    Insider PBSteve's Avatar
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    Quote Originally Posted by neftaly View Post
    Can't edit my post (grumble grumble), and can't PM Simon to edit it, but I moved the test recording for the sonic chrony idea.
    http://soundcloud.com/neftalydotcom/sonic_chrony
    Microphone -> ADC then pass it through a DFFT and you could probably pick out those features pretty easily once you got it working. The trick is going to be getting sufficient bandwidth, as the really distinct features sound like they're highish on the frequency spectrum, but as long as it hits 100kHz to be safe you should be fine. Probably gonna need a filter or two, but what circuit doesn't...

    What's the clock speed of an arduino?

    Edit: What am I thinking... a couple band-pass filters would be sufficient.
    Last edited by PBSteve; 05-14-2013 at 11:50 AM.
    Ever so many citizens of this republic think they ought to believe that the Universe is a monarchy, and therefore they are always at odds with the republic. -Alan Watts

    I work for the company building the Paragon

  9. #69
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    http://hackaday.com/2013/08/14/makin...motion-sensor/

    So that [the opensource backpack, not the doppler module, I already have like 5 of those] actually makes radar super easy, will get one and look into it.
    Last edited by neftaly; 08-14-2013 at 07:39 PM.

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