#include <SoftwareSerial.h> // import another program, a library, to communicate
#define rxpin 1 
#define txpin 0

SoftwareSerial serial(rxpin,txpin);

int rxPin = 1; // this is simular to the int = setting, however this is linked to the library
int txPin = 0;
int trig = 3; 
int echo = 2; 
int trig1 = 8; 
int echo1 = 7; 
long lecture_echo; 
long cm;
int timeout = 1000;

void setup() 
{ 
//  pinMode(trig, OUTPUT); 
 // digitalWrite(trig, LOW); 
 // pinMode(echo, INPUT);  
  
  pinMode(trig1, OUTPUT); 
  digitalWrite(trig1, LOW); 
  pinMode(echo1, INPUT); 
  
  serial.begin(9600);   
}
void loop() 
{ 
// digitalWrite(trig, HIGH); 
// delayMicroseconds(10); 
// digitalWrite(trig, LOW); 
// lecture_echo = pulseIn(echo, HIGH,  timeout*1000); 
// cm = lecture_echo / 58; 

 // if (cm >= 400 || cm <= 0){
 //   serial.println("Out of range");
 // }
 // else {
 //   serial.print(cm); 
 //   serial.println(" cm");
  
 // }


digitalWrite(trig1, HIGH); 
delayMicroseconds(10); 
digitalWrite(trig1, LOW); 
lecture_echo = pulseIn(echo1, HIGH, timeout*1000); //timeout in micro seconden
cm = lecture_echo / 58; 

  if (cm >= 400 || cm <= 0){
  serial.println("Out of range");
  }
  else {
    serial.print(cm); 
  serial.println(" cm");
  
  }
  
  delay(timeout); 
}