#define Trig 10 
#define Echo 11
#define Led 2
long width, distance; 
void setup() 
{
Serial.begin (9600);
pinMode(Trig, OUTPUT);
pinMode(Echo, INPUT);

}

void loop() {
digitalWrite(Trig, 0); 
delayMicroseconds(2); 
digitalWrite(Trig, 1);
delayMicroseconds(10); 
digitalWrite(Trig, 0);
width = pulseIn(Echo, 1);
distance = width/58.2;
Serial.print(" Distance is: ");
Serial.print(distance);
Serial.println(" cm");
 if (distance<100)
   digitalWrite(Led,1);
 else
   digitalWrite(Led,0);
delay(1000);


}