/////////////////////////////////////////////
#include <Servo.h>
Servo servo1;

const int pingPin = 9;
int inPin = 8;

int l1=12;
//////////////////////////////////////////////
void setup() {
Serial.begin(9600);

servo1.attach(13);

pinMode(l1, OUTPUT);
}

/////////////////////////////////////////////
void loop() {
long duration, cm;
 
pinMode(pingPin,OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(5);
digitalWrite(pingPin, LOW);

pinMode(inPin,INPUT);
duration = pulseIn(inPin, HIGH);
 
cm = microsecondsToCentimeters(duration);
 
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);

///////////////////////////////////////////

if(cm <= 100) {
servo1.write(90);
digitalWrite(l1,1);
}

if(cm > 100) {
servo1.write(0); 
digitalWrite(l1,0);
}
}

/////////////////////////////////////////////////
long microsecondsToCentimeters(long microseconds)
{return microseconds / 29 / 2;}