Voltage Monitor Problem

Morning,

 

I hooked up my voltage monitoring as per the instructions in the manual.  I get a reading of 16v rather than 12.45V that I get on my test meter.

 

Any ideas?

 

Regards,

Solo.

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Replies

  • Morning All,

     

    Ok, so I gave up with the calculations on the Voltage monitoring page and I fitted a 10k Variable pot resistor like the one attached. It is a no drift type so hot and cold in regular conditions does not effect the resistence.  When I was finished, it measured at 3080Ohms.

     

    Hope this helps anyone else having simular issues.

     

    Regards,

    Solo.

    p124.jpg

    https://storage.ning.com/topology/rest/1.0/file/get/3692242097?profile=original
  • Morning,

     

    ok, so have done some more homework.  Here's how I propose to do it without changing any code.

     

    My Target is 4.58V as I understand it.

    I used http://www.raltron.com/cust/tools/voltage_divider.asp to calculate the ohm rating for R2 which is 5.710ohms.

     

    Unfortunately I could not find a 5.7k resistor so I used http://www.raltron.com/cust/tools/parallel_resistance.asp to calculate the closest possible match that I can get.  24k + 7.5k in parallel gives me 5.71ohms.

     

    So I will try to find two of these resistors and solder them in and test.

     

    If I am going to be blowing up my APM, please warn me, I will certainly read all of your posts tomorrow evening when I attempt this.

     

    Regards,

    Solo.

  • Morning,

     

    Perhaps you are looking for more details to respond to this one.

     

    I am running a 3S lipo battery.  I have solded into the board the balance connector.  Grnd is Grnd, an0 = 4v and an1=8v and an2=12v.  I have soldered in the 3 3.9k resistors and measured them to make sure they were the correct values as per the howto.

     

    I would really appriciate a response on this one.

     

    Regards,

    Solo.

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