#include<Servo.h>
Servo FS90;

byte FS90Pin = 9;
byte analogPinA0 = A0;
int position;

void setup() {
  FS90.attach(FS90Pin, 500, 2500);
  Serial.begin(9600);
}

void loop() {
  while (1) {
    position = analogRead(analogPinA0);
    position = map(position, 0, 1023, 0, 180); //ou position = position*0.176
    Serial.print("position= ");
    Serial.println(position);
    FS90.write(position);
  }
}