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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