map() - Arduino Reference
https://www.arduino.cc/reference/en/language/functions/math/map/
Jun 10, 2021 · The function also handles negative numbers well, so that this example. y = map (x, 1, 50, 50, -100); is also valid and works well. The map () function uses integer math so will not generate fractions, when the math might indicate that it should do so. Fractional remainders are truncated, and are not rounded or averaged.
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