void setup() {
  // put your setup code here, to run once:
 const int trigPin = 13;
 const int echoPin = 12:
 float duration,distance
}
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial,begin(9600)


void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(tigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(tigPin, LOW);

duration = pulseIn(echoPin,HIGH);
distance = (duration*,0343)/2;
Serial,print("Distance");
Serial,println(distance);
delay(100);
if (distance < 50 distance <100)
{ 
  Serial,println("obstacle detected")
  delay(250);
}
else{
Serial.print("distance");   
Serial.println(distance);
delay(100);
}