int led=5;
int trig=12;
int ecch=11;
void setup() {
  // put your setup code here, to run once:
pinMode(led,OUTPUT);
pinMode(trig, OUTPUT);
pinMode(ecch, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig,HIGH);
delayMicroseconds(10);
int t=pulseIn(ecch,HIGH);
int distance=t*0.0342/2;
if(distance<10)
{
  digitalWrite(led,HIGH);
}
else
{
  digitalWrite(led,LOW);
}
delay(100);
}