Arduino Resistance Changing

Grumpy_Mike:
And the comments say:-
My underlining but makes the point.

i always try to see "the other side" - and given my minimal knowledge of electronics, this may be nonsense;
could there be some sort of circuit where the difference b/n 217.8 and 218.79 Ohms makes all the difference ?

R.val    R-1%      R+1%
 220    217.8     222.2
 221    218.79    223.21