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Help w/ low battery indicator please!

  1. Jan 20, 2010 #1
    Any help is appreciated,

    I have a 11.1v battery system, an I would like to install a low battery indicator. I would like the indicator to be a single red LED that initiates when the voltage drops below 7v. Size is definitely a concern here.

    I have looked online at various templates, but I just can't find what I am looking for. I admittedly only know enough about electrical circuits to get myself in trouble. I suppose the main question is; what type of components should I use? I'm not sure I know how to do the math to get the threshold set at 7v.
     
  2. jcsd
  3. Jan 20, 2010 #2

    mgb_phys

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  4. Jan 20, 2010 #3
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