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motion detector?

Discussion in 'Electronic Basics' started by Tristar500, Jul 12, 2005.

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  1. Tristar500

    Tristar500 Guest

    Hi Guys, I'm working on a project that is supposed to encourage kids to
    ride a stationary bike for three minutes. The plan is to have the rider
    hit a button when they get on the bike and that sets a series of timers
    going each one triggering a light or embedded sound bit encouraging the
    kid and perhaps announcing how much time is left.

    Here's the part I'm having trouble with. The bike needs to detect
    whether or not the kid is actually pedaling and it not reset itself. I
    was thinking a hall sensor or a proximity sensor (the type used in
    automation) or perhaps a reed switch mounted on the hub of the wheel
    with a small weight on the trigger that would depress once centrifugal
    force pushed it out.

    In short, Kid gets on bike, hits start button, three minutes go by and
    bells and whistles sound. If the kid stops pedaling at any time he has
    to start over.

    Any ideas? Simple if possible.


    Lawrence
     
  2. John Fields

    John Fields Guest

    ---
    Click on:


    or check "Motion detector (from seb)" on
    alt.binaries.schematics.electronic.
     
  3. Brian

    Brian Guest

    You could hook a small DC motor to the wheel and use it as a generator.
    You could then use the DC voltage to do whatever you wanted.

    Brian
     
  4. ehsjr

    ehsjr Guest

    A magnet mounted on the crankarm (for the pedal
    on the side opposite the main drive gear) and a reed
    switch mounted to the frame such that the reed transfers
    each time the crankarm passes by can be used to generate
    pulses. Feed them into a simple missing pulse detector.
    http://www.uoguelph.ca/~antoon/circ/mispulse.htm

    Ed
     
  5. Tristar500

    Tristar500 Guest

    Ed, I like it! reed switch makes much more sense then the coil idea.
     
  6. John Fields

    John Fields Guest

    ---
    The reed switch will work nicely with the circuit I posted for you on
    alt.binaries.schematics.electronic.

    If you received it I'd appreciate an acknowledgement.

    Thanks,
     

  7. Not likely, John, since he is posting through Google.

    --
    Link to my "Computers for disabled Veterans" project website deleted
    after threats were telephoned to my church.

    Michael A. Terrell
    Central Florida
     
  8. Tristar500

    Tristar500 Guest

    Hi John, I looked for something on alt.binaries.schematics.electronic
    but didn't see anything.

    Perhaps I was too late? I didn't know it was coming until now.

    Lawrence
     
  9. John Fields

    John Fields Guest

    ---
    No, it's just that Google doesn't archive binaries, so you'll never
    see it from Google groups, and since your ISP is Time-Warner
    Road-Runner they don't provide access to Usenet directly, so you're
    stuck.

    I'll email it to you.
     
  10. John Fields

    John Fields Guest

    ---
    Yeah, you're right; I missed that.

    Thanks.

    Bummer about that psycho interfering with your good work...
     
  11. Its easy enough to miss. No problem. ;-)

    I reported the call to the Sheriff, then found that the one who made
    the call was bragging about it on Then he
    followed that with threats that he was going to have the Florida State
    Attorney General stop my project. One of the people collecting
    computers for me works for the Florida State Attorney General, so that
    would be interesting.

    His ISP has already cut off his usenet access, now he's using Google
    Groups to spout more garbage. There is no one on that group willing to
    flame him like they should, and I have to ignore him till the legal
    matter is settled.

    He hasn't stopped the project. My goal is to collect, repair, and
    distribute 100 complete used computer systems to Disabled Veterans in my
    area from July 1, 2005 to July 1, 2006. I may be 100% disabled, but I
    can still work an hour or two a day, most days so I plan on staying
    busy.

    --
    Link to my "Computers for disabled Veterans" project website deleted
    after threats were telephoned to my church.

    Michael A. Terrell
    Central Florida
     


  12. TWC/brighthouse had their own news servers when I had their service.
    They had regional servers for each service area. Acoording to the TWC
    website they still offer access to newsgroups:


    FAQ >> Road Runner High-Speed Online


    Q: Are newsgroups available?

    A: Yes, 45,000 newsgroups are available through Road Runner. We've also
    included a number of newsgroups specific to Road Runner. These
    newsgroups are designed to allow subscribers to talk about and get
    answers to general questions about the service.

    In order to use newsgroups, you need a news client. We install and
    configure the Microsoft Outlook Express news client during your Road
    Runner installation; however, there are a number of other news clients
    available. With Microsoft Outlook Express, you will be able to search
    for newsgroups, read articles from and post articles to the newsgroup,
    and download binary attachments to newsgroup articles.




    --
    Link to my "Computers for disabled Veterans" project website deleted
    after threats were telephoned to my church.

    Michael A. Terrell
    Central Florida
     
  13. ehsjr

    ehsjr Guest

    Glad to see he's going to get it. It's nice.

    Ed
     
  14. John Fields

    John Fields Guest

     
  15. John Fields

    John Fields Guest

     
  16. John Fields

    John Fields Guest

     
  17. <http://www.timewarnercable.com/Search/SearchResults.ashx?query=newsgroups&levelid=0>
    has three references to newsgroups.

    I think I had to contact their customer support to find out which
    news server to use for my area.

    --
    Link to my "Computers for disabled Veterans" project website deleted
    after threats were telephoned to my church.

    Michael A. Terrell
    Central Florida
     
  18. Thank you, John. May he bless you, as well.

    Like I've said since I was laid off and got sick over three years
    ago: i was going to find something to occupy my time when I was well
    enough. This will not only help me, but the kids at my church I am
    teaching to fix computer problems, and the disabled veterans who will
    have something they couldn't afford on their pensions.

    I am thinking about setting up a "Safe online browsing and computer
    care course" for a $25 per head donation to help pay for the gasoline
    and other supplies I am paying for out of my pocket. I think that 5, two
    hour sessions once a week for that price is fair, and will save anyone
    who takes the course more than that in aggravation and repair bills for
    cleaning the garbage from their computers. What do you think of the
    idea?

    --
    Link to my "Computers for disabled Veterans" project website deleted
    after threats were telephoned to my church.

    Michael A. Terrell
    Central Florida
     
  19. John Fields

    John Fields Guest

  20. John Fields

    John Fields Guest

     
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