@ first ... your processor will be able to see a change only AFTER data have been collected ( La Pallice, french philosopher ).
from that, if you collect data once a second ( as written @ post #1 ) no need to scan value @ each millisecond ...
just place your test ONCE after data collection ( ADC conversion or serial value received ) and you won't loose any time !!!
no need to have a watching loop nor ...
Alain
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