boa noite a todos peguei esse codigo no fórum ele esta funcionando certinho, sendo que eu queria colocar para acender o led em cada sensor, independe, com 10cm cada de distancia tentei acrescente mais o codigo ta dando erro, o codigo ficou assim, por favor preciso de ajuda!

// this constant won't change. It's the pin number
// of the sensor's output:
const int pingTrigger = 8;
const int Sensor_1 = 7;
const int Sensor_2 = 6;
const int Sensor_3 = 5;
const int ledPin = 13;
void setup();
{
pinMode(ledPin, OUTPUT);
pinMode(pingTrigger, OUTPUT);
pinMode(Sensor_1, INPUT);
pinMode(Sensor_2, INPUT);
pinMode(Sensor_3, INPUT);

// initialize serial communication:
Serial.begin(9600);

void loop();
{
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, inches, cm;

// SENSOR 1
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(pingTrigger, LOW);
delayMicroseconds(2);
digitalWrite(pingTrigger, HIGH);
delayMicroseconds(5);
digitalWrite(pingTrigger, LOW);

// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
duration = pulseIn(Sensor_1, HIGH);
// convert the time into a distance
inches = MicrosecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.println("Sensor 1");
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();

delay(100);

// SENSOR 2
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(pingTrigger, LOW);
delayMicroseconds(2);
digitalWrite(pingTrigger, HIGH);
delayMicroseconds(5);
digitalWrite(pingTrigger, LOW);

// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
duration = pulseIn(Sensor_2, HIGH);

if (Sensor_1 > 50){
digitalWrite(ledPin, HIGH);
}
else{

digitalWrite(ledPin, LOW);
// convert the time into a distance
inches = MicrosecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.println("Sensor 2");
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();

delay(100);

// SENSOR 3
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(pingTrigger, LOW);
delayMicroseconds(2);
digitalWrite(pingTrigger, HIGH);
delayMicroseconds(5);
digitalWrite(pingTrigger, LOW);

// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
duration = pulseIn(Sensor_3, HIGH);

// convert the time into a distance
inches = MicrosecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.println("Sensor 3");
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();

delay(1000);
{

long MicrosecondsToInches(long microseconds)

// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
return microseconds / 74 / 2;

}
long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;
}

aguarda uma possível ajuda,

obrigado