Battery level gauge LM3194

Discussion in 'The Projects Forum' started by bigK, May 4, 2013.

  1. bigK

    Thread Starter New Member

    Mar 31, 2013
    7
    0
    Hi guys,
    I have watched this great link on building a battery charge monitor (https://www.youtube.com/watch?v=iIKGvHjDQHs), I want to do the same thing but i am using a single cell battery. The range needed is 2.75V to 4V. I assumed that by removing the voltage divider at the signal in (pin 3) and just making the connection without halving the signal voltage would work in the same way but from a range of around 3V to 4.25V as mentioned in the video. For some reason this causes the bar graph to work wrongly. could you please help me out or put me contact with the guy that made the video......Thanks
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,999
    745
    No problem set the upper voltage limit on pin 6, and lower limit on pin 4, use an extra lm317 to set the lower limit, and use the internal one for the upper.

    see page 13 for an alternate circuit http://www.ti.com/lit/ds/symlink/lm3914.pdf
     
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