You just need to think a little bit to help me find the solution

Maurício Vilarinho

I have rpm, max_rpm and a variable x.

When rpm aproaches max_rpm -> x tends to 0

When rpm aproaches 0 -> x tends to 255

x = (rpm/rpm_max)*255;
arduino.analogWrite(g,(int)x);

I have the exact opposite. What can I do? I'm really dumb to figure it out.

obe

If I understood your question correctly then maybe this?

x = (1 - rpm/rpm_max)*255

UPDATE: as mentioned by CandiedOrange - rpm and rpm_max need to be float or double for it to work. Otherwise the value of x would simply switch back and forth between 0 and 255.

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edited at2021-04-10

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