Reading 2 seperate batterys A2D?

Discussion in 'General Electronics Chat' started by thevoodoochild, Jul 23, 2011.

  1. thevoodoochild

    Thread Starter New Member

    Jan 14, 2011
    21
    0
    Hi forum, Voodoo the bot builder here again.

    I am using pic18f4550 with 3.5v battery .I am using an A2D port & took the vref off the output of the switching regulator @5v & all working fine. I took the vref ext off the regulator as the voltage stays constant. What I'm stuck with is ;
    I have 2 batterys the same lipo 3.5v. One for the micro & the other for the motors. the motor regulator runs @ 6.5v & I cannot read both batterys using A2D cos I get a conflict from the vref cos its a seperate battery. Apart for building a circuit I cannot see a way around this. I would prefer to read both batterys A2D.
     
    Last edited: Jul 23, 2011
  2. mcasale

    Member

    Jul 18, 2011
    210
    12
    Hi. Can you post a schematic of your circuit? Are you trying to read a "floating" battery signal on your ground-referenced MPU?
     
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