Trying to simulate a motor that fails after starting up

Discussion in 'The Projects Forum' started by Modern Primate, Mar 3, 2016.

  1. Modern Primate

    Thread Starter New Member

    Mar 3, 2016
    7
    1
    Hi folks,

    I'm in the process of building something of a steampunk joke gift for a friend and I want it to give the impression of starting up before puttering out.

    So basically:
    - the user will hit a button or flip a switch
    - the motor will rev up (vrum vrum vrum vrumvrumvrumvrumvrum...)
    - after about a second the motor will "fail" (vrumvrumvrum vrow vroow vroooow)
    - an led will light up behind a paper display of an error message

    The trouble is, I'm an absolute beginner and I'm not even sure what to google. Can I do this with capacitors and motors? Should I be looking at arduino? I covered electronics in a college physics class but I have never picked up a soldering iron without burning myself.

    While I'd love it if someone just told me the easiest way to accomplish this, I'd also be happy with just an idea of what to look up so I can get started.

    Thanks!
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,979
    744
    555 timer monostable with relay output, puts motor on,then motor off after set delay and puts led on..... simple
     
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  3. wayneh

    Expert

    Sep 9, 2010
    12,103
    3,038
    What sort of motor are we talking about? Since you want sound, maybe you don't really need the motor, maybe just a sound file to play?

    If you really want a motor, maybe you need a slow start? Otherwise it will be instant on.
     
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  4. Modern Primate

    Thread Starter New Member

    Mar 3, 2016
    7
    1
    Great! A bunch of places to start, I appreciate it.
     
  5. Modern Primate

    Thread Starter New Member

    Mar 3, 2016
    7
    1
    I wanted a motor because I want to have a bit of vibration along with the sound. Maybe a motor isn't the best way to accomplish the sound portion, though?

    I didn't realize a motor could be slow start. I thought that would be externally controlled. I will check that out, thanks!
     
  6. ISB123

    Well-Known Member

    May 21, 2014
    1,239
    527
    Motors are fairly quiet, how are you going to produce the sound you need?
     
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  7. wayneh

    Expert

    Sep 9, 2010
    12,103
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    Sorry if it seemed I implied it was a type of motor. I was referring to a slow-start circuit. For example some power tools such as my router do slow starts to avoid jerking when they start, which could be a safety issue or make it hard to do some jobs. It's still pretty fast. Using a flywheel might help slow down the start and stop times.

    One thing you might look into is a cellphone vibrate motor. These are tiny DC motors with an unbalanced flywheel. They obviously make noise and vibrate. If you control the rpm, you might get a nice effect. Pull one out of a dead cellphone.
     
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  8. Modern Primate

    Thread Starter New Member

    Mar 3, 2016
    7
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    I was actually going to try a flywheel (or something attached to one) that was a set up similar to how we used to use playing cards on our spokes to make our bikes sound ridiculous when we were kids. The card (or whatever was going to stand in for one) would also serve to slow down the flywheel once the power was cut.
     
  9. Modern Primate

    Thread Starter New Member

    Mar 3, 2016
    7
    1
    That looks more like my ignorance reading it incorrectly than you actually implying anything. :)

    The router explanation makes good sense, since I have one of them as well. I always assumed it was a flywheel making it start slowly. Either method should work, I think.

    I happen to have a few old cell phones in a drawer. That's an excellent suggestion, thank you.

    I'm not sure I can still use the 555 timer for all of this now, though...
     
  10. ISB123

    Well-Known Member

    May 21, 2014
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    You can those are normal dc motors with just the flywheel cut in half.
     
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  11. wayneh

    Expert

    Sep 9, 2010
    12,103
    3,038
    There's a trick where you use one of those cellphone motors inside a paper envelope, powered by a button cell battery, and activate it when the "victim" opens the envelope. It makes quite a racket.
     
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  12. Modern Primate

    Thread Starter New Member

    Mar 3, 2016
    7
    1
    Not sure if anyone is still reading this thread, but I have another question. It looks as though the 555 timer only handles loops. I'm looking to start a motor, stop it, then light up an led that stays on until the switch is flipped again. What would I look for to accomplish that?
     
  13. ebeowulf17

    Active Member

    Aug 12, 2014
    678
    79
    I think the key word here is monostable (as opposed to astable 555 circuits which do just loop forever.)
     
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  14. Modern Primate

    Thread Starter New Member

    Mar 3, 2016
    7
    1
    Ah! Thank you!
     
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