7.2 voltage indicator

Discussion in 'The Projects Forum' started by Ubi, Aug 14, 2015.

  1. Ubi

    Thread Starter New Member

    Aug 14, 2015
    2
    0
    I'm trying to make a voltage Indicator light for 2, 7.2 lithium batterys. Each battery set is 7.2 volts and 1700 MHa each battery. Id like to use a dual Bi-Color LED 5mm that would light up green when the battery is between 8.2 to 7.7. Then orange between 7.6 to 7.2 then red from 7.2 to 6.6. I had read on the Internet were it said to use a LM358 op-amp I'm not sure if I can use it. Any suggestions would be great fully appreciated.
     
  2. absf

    Senior Member

    Dec 29, 2010
    1,493
    372
    use LM393 instead of LM358. Google for "window comparator" and see how it work...

    Allen
     
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    You will need a voltage reference, too. I recommend the TL431
     
  4. jjw

    Member

    Dec 24, 2013
    173
    31
  5. Ramussons

    Active Member

    May 3, 2013
    557
    92
    As jjw posted, these were available from Online stores some time back for about 7 Dollars.

    BGInd.jpg Something like this.
     
  6. Ubi

    Thread Starter New Member

    Aug 14, 2015
    2
    0
    I wanted to thank you all for such a quick respond. I"m going to try the options you have all gave me I "ll let you know with one i used.
     
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