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Discussion in 'General Electronics Discussion' started by discomark10, Nov 5, 2013.

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  1. Nov 5, 2013 #1
    discomark10

    discomark10

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    Sep 18, 2013
    Hi guys,
    is there a component which will give say.. a resistance increase when the device is spun at a certain speed.
    A bit like a trigger wheel with a hall sensor, but rather than a high/low output from sensing the teeth of the trigger wheel... a resistance at a certain speed.

    The reason I don't want to go for a trigger wheel is the size for one and also the delay between teeth.

    Cheers
     
  2. Nov 6, 2013 #2
    shrtrnd

    shrtrnd

    3,827
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    Jan 15, 2010
    If there were, it would be pretty expensive.
    What you need to do, is use a tach, married to a circuit built to do what you want it
    to do.
    A little more specific information might help put you on the best path to persue this.
     
  3. Nov 7, 2013 #3
    GreenGiant

    GreenGiant

    842
    7
    Feb 9, 2012
    my only thought would be to use something liek shrtrnd said OR try and rig something like a small speedometer which is cable driven but instead of driving the indicator hook that up to a potentiometer, but that would be pretty big.
     
  4. Nov 8, 2013 #4
    donkey

    donkey

    1,300
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    Feb 26, 2011
    use a hall sensor connect it to an LED then use a photo resistor, in effect its like pwming it but with a photoresistor. hope that helps
     
  5. Nov 8, 2013 #5
    KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
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    Nov 28, 2011
    Why don't you describe your whole project from start to finish. There may be a way to make it work, but that way may not be the way you imagine.

    Give us a thorough descripiton of what you want to achieve, including, but definitely not limited to, telling us about the rotating device that you want to monitor, and what you want to happen when a particular speed is reached.
     
  6. Nov 9, 2013 #6
    discomark10

    discomark10

    9
    0
    Sep 18, 2013
    basically I want to make a better traction control for off-roading.
    I want to control say a liner actuator or something alone those lines from a wheel rotation speed difference.
    Kris you may have just inadvertently given me the solution, its 5:30 am and I misread your post for a second.
    A simple motor/dynamo gives a voltage when turned, I could possibly use that.
    I wonder how accurate the output from it would be, one of the problems with existing traction control is that it takes quite a while to kick in and also is rather jerky, which is also not a desired trait.
     
  7. Nov 9, 2013 #7
    discomark10

    discomark10

    9
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    Sep 18, 2013
    Not sure what happened there, posted that twice..
     
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