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Al posto di questo....
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if (Serial.available())
{
int speed = Serial.parseInt();
if (speed >= 0 && speed <= 255)
{
analogWrite(motorPin, speed);
}
}
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metti...
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if (t > 30)
{
speed = 255 ;
}
else
{
speed = 0 ;
}
analogWrite(motorPin, speed);
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