rxreader.pde

unsigned long duration;
unsigned long time0;
unsigned long time;

void setup() {                
  Serial.begin(9600);
  // signal pin 
  pinMode(2, INPUT);
  // 
  time0 = micros();
}

void loop() {
  // 
  time = micros();
  // read pulse width
  // if there is no pulse during 50000 microseconds
  // then it returns 0
  duration = pulseIn(2, HIGH, 50000);  

  //
  Serial.print("Time interval = ");
  Serial.print(time - time0, DEC);
  Serial.print(", Pulse width = ");
  Serial.println(duration, DEC); 
  
  //
  time0 = time;
}