const int trigPin = 12;  
const int echoPin = 11; 

float pulseTime ; 



void setup() {
 pinMode(trigPin, OUTPUT);  
	pinMode(echoPin, INPUT);  
  Serial.begin(9600);  
  Serial.print("RW"); 
}

void loop() {
  digitalWrite(trigPin, LOW);  
	delayMicroseconds(2);  
	digitalWrite(trigPin, HIGH);  
	delayMicroseconds(10);  
	digitalWrite(trigPin, LOW); 

  pulseTime = pulseIn(echoPin, HIGH);

  float distance = ( 0.0343/2.0 * pulseTime) ; 
  Serial.println(distance); 

  delay(1000); 
}