Hy

Hmm I like to calculate the cos-1() but when I use acos the result is wrong.

So: cos-1(500/1000) => 60° the Arduino does calculate 90° why?

This is the code:

float alpha = acos(500/1000);

int grad = alpha*57.2957795131; //is the same as (180/pi)

Serial.println(grad);

What am I doing wrong?

THx

Andy