if (half == HIGH); {
dimming = 100;
}
The semi colon after the if() is wrong, it terminates the if statement and the effect is to make dimming = 100 whether half is HIGH or LOW.
Remove it.
if (half == HIGH); {
dimming = 100;
}
The semi colon after the if() is wrong, it terminates the if statement and the effect is to make dimming = 100 whether half is HIGH or LOW.
Remove it.