Sharp sensor on arduino darylrobotproject.wordpress.com

#define sensorIRleft A1 //Must be an analog pin

float sensorValue;
int cm;
int led = 9;
int brightness = 0;

void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}

void loop() {

  sensorValue = analogRead(sensorIRleft);
  cm = 10650.08 * pow(sensorValue,-0.935) - 10;

  if (cm>200||cm==0) {
    cm = 200;
  }

  delay(100);
  Serial.print("CM: ");
  Serial.println(cm);
  brightness = map(cm, 0, 200, 0, 255);
  analogWrite(led, brightness);
  delay(10);
}