ultrasonicwithled.txt

int trigger = 12;
int echo = 13

int led = 8


void setup()

{ Serial.begin (9600);

pinMode(trigger, OUTPUT);

pinMode(echo, INPUT);

pinMode(led, OUTPUT);

}

void loop()

{ long duration, distance;

digitalWrite(trigger, LOW);

digitalWrite(trigger, HIGH);

digitalWrite(trigger, LOW);

duration = pulseIn(echo, HIGH);

distance = (duration/2) / 29.1;

if (distance < 10)

{ digitalWrite(led,HIGH);

}

else {

digitalWrite(led,LOW);

}

Serial.print(distance);

Serial.println(" cm");

delay(500);

}