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finding short on motherboards with a shorty (with display)

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wacd:
I built this Shorty on breadboard it works relatively good but there is one thing that i don't understand.

When i measure various shunt resistors it shows me strange results

0.0200R - 0.0189
0.0250R - 0.0245
0.0330R - 0.0333
0.0400R - 0.0430
0.1000R - 0.1100

Something wrong but i don't know what.

kripton2035:
did you build MY shorty-with-display with arduino nano, or the "clone" with ST controller ?
the shorty-with-display is not a precision instrument, so the error is possible. it's only to measure relative to another point
also I suspect the device to change the value when it becomes hotter with time. it could change values

Antonio90:
Hello, all results are within 5% tolerance, except the last one, which is 10%.
What is the tolerance of the shunts? 5-10%? Even if the resistors are 1% the results are well within expected values for a continuity tester IMHO.

wacd:
I removed these shunts from laptop motherboards

There is something about the results , its like a pattern for example

-10
-5
-2
-0
+2
+5
+10

Sorry for not being able to explain myself i'm just a begginer at this kind of work and a complete stranger to the software side of the project.

wacd:
Yes its your version Kripton. It's a clone nano. MCU has Atmel writing on it. 328P.

@Antonio90

All of them are %1


If i play around with these configs , i can get it to display the exact value of the resistor that i'm measuring. But when i change the resistor with a smaller or with a bigger value , it just does not measure it correctly. How can this be improved any suggestions?

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