strain gauge help

Discussion in 'The Projects Forum' started by giovi1514, Aug 14, 2013.

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  1. giovi1514

    Thread Starter New Member

    Aug 14, 2013
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    hello, hopefully you guys can help me i am a bit stuck and i am sure that it is something simple i am missing.

    basically i want to build a circuit with a strain gauge so that i have a pressure sensitive kill switch. the strain gauge will be used to detect pressure applied to a steal rod and activate a separate circuit which will cause a engine to cut out for 75ms once the pressure has been detected. however i am having trouble finding a way to make the strain gauge circuit in to a on/off one. as i said i am sure that it is something simple i am missing.

    the strain gauge is in a wheatstone bridge and is connected to a 12v dc battery however anything apart from the strain gauge can be changed to achieve the desired result. budget is a factor though


    hopefully you can understand what i am trying to explain.
    thanks
     
  2. #12

    Expert

    Nov 30, 2010
    16,346
    6,833
    And after the engine stops for 75 milliseconds, what? Ignore the strain gauge?
     
  3. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    5,003
    745
    Use an op amp to amplify the output or use a Differential amp

    amp
     
  4. giovi1514

    Thread Starter New Member

    Aug 14, 2013
    2
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    ah, thanks that is perfect i knew i had missed something simple.

    unfortunately i have ran into another problem the circuit i was going to use to cut the engine (by grounding the coils) does not work. does anyone know of a circuit i can use?all i needs is a variable time of 50-100ms which can be acheaven anyway something simple like changing a capacitor would be best though


    basically i am making a diy quickshifter for my motorbike (because i am a cheapskate and have more time then money :) ) when pressure is applied to the shift lever the engine will cut out for x amount of time allowing for much quicker gear changes there is a lot of videos on youtube if you want to have a look.

    Thanks again

    the bike is a sv650 btw
     
    Last edited: Aug 14, 2013
  5. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    The owners of All About Circuits has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)

    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:

    http://forum.allaboutcircuits.com/showthread.php?t=54400

    Another good forum that shares many of the same membership is http://www.electro-tech-online.com/ . Good luck.
     
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