#Define EchoPin = 3;
#Define TriggerPin = 4;
#include <SoftwareSerial.h>
SoftwareSerial mySerial(4, 3); // RX, TX
 
void setup() {
  //pinMode(6,OUTPUT); 
 // mySerial.begin(4800);
   
   pinMode(TriggerPin, OUTPUT);
   pinMode(EchoPin, INPUT);
}
 
void loop() {
   int cm = ping(TriggerPin, EchoPin);
    mySerial.print("Distance in cm:");
   mySerial.println(cm);
   delay(500);
}
 
int ping(int TriggerPin, int EchoPin) {
   long duration, distanceCm;
   
   digitalWrite(TriggerPin, LOW);  
   delayMicroseconds(100);
   digitalWrite(TriggerPin, HIGH); 
   delayMicroseconds(200);
   digitalWrite(TriggerPin, LOW);
   
   duration = pulseIn(EchoPin, HIGH); 
   distanceCm= duration*0.039/2;
   //distanceCm = duration * 10 / 292/ 2;   
   return distanceCm;

}