I don't get it and doubt I ever will. I have been wrestling with this for
ages.I used to be a halfway decent programmer. Thankfully I didn't try
electronics.
I read online that equal resistor values will halve the voltage reading,
Exactly what I want. Bring it down from 12 to 6 so the MS-TV will handle
it. Nothing I see mentions what values to use. I came up with 1K by
experimenting.
I have seen nothing online that talks about standby current and I don't
know what it is.
Thanks for trying to help but I think I'm beyond it.
Peter
On Sat, Feb 21, 2015 at 11:40 AM, Colin Reese <colin.re...@gmail.com> wrote:
> I unfortunately cannot read your ascii art, which in itself is
> disappointing.
>
> 2k is a bit low for a divider - you'll get standby current of 6mA. You
> should also try optimizing the split to fit the range you can measure. So
> you'd want a ratio of R2/Rtotal =measured range/ measurable range. So
> 2.2k/10k would give you standby of <1mA and a range of 12.2V.
>
> As for diagnosing your actual problem, I'd get out a meter or scope to
> determine which end your issue is on.
>
> Colin
>
>
>
>
> > On Feb 21, 2015, at 11:29 AM, Peter Hollenbeck <pwhb...@gmail.com>
> wrote:
> >
> > I am using a LinkUSB and an MS-TV to read voltage from a 12 volt system.
> The MS-TV is limited to 10 volts so a made a voltage divider. I know next
> to nothing about electronics. Two weeks ago, with a test 12v power supply I
> played with various resistor values, from 1K to 1M. The 1K resistors
> appeared to give the best reading, about 6 volts. The higher the value the
> lower the output. Now, working with a real 12v battery system I am getting
> values ranging all over - .1, .82, .07, 10+, and rarely something
> reasonable, like 6.6.Within several minutes I just got 0.7 followed by
> 9.75. An inverter connected to the battery bank displays 12.1 volts and the
> output from my program shows .71 volts.
> >
> > My divider looks like this:
> >
> > 1K 1K
> > ---------^v^v------------^v^v-----------------------
> > | | | |
> > | | | |
> > | | | |
> > | | | |
> > battery (+) | | battery (-)
> > MS-TV MS-TV
> > red wire black wire
> >
> > I sure would appreciate suggestions.
> > Thank you,
> > Peter
> >
> >
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