void setup() { 
    pinMode(11,OUTPUT); // on
      pinMode(10,INPUT); // mas de 500
        pinMode(9,INPUT);  // mas de 750
   
}


void loop() {
  // read the sensor:
 // int sensorValue = analogRead(A1);
  
  int sensorValue = analogRead(A0);

 if (sensorValue < 100)
{
   digitalWrite(11, HIGH); 
    digitalWrite(10, HIGH); 
  digitalWrite(9, HIGH); 
   
}
else if (sensorValue > 300)
{
 digitalWrite(11, HIGH); 
    digitalWrite(10, LOW); 
  digitalWrite(9, HIGH); 
}
else
{
  digitalWrite(11, HIGH); 
    digitalWrite(10, HIGH); 
  digitalWrite(9, LOW); 
}  
  // print the sensor reading so you know its range

  // map the analog input range (in this case, 400 - 1000 from the photoresistor)
  // to the output pitch range (120 - 1500Hz)
  // change the minimum and maximum input numbers below
  // depending on the range your sensor's giving:
  int thisPitch = map(sensorValue, 0, 1023, 200, 6000);
  //int thisPitch = map(sensorValue, 100, 600, 200, 2000);

  // play the pitch:
  tone(3, thisPitch, 1000);
  // tone(3, 440, 1000);


  
  delay(100);        // delay in between reads for stability
}