text: Hello everyone!
  I am an artist and I am trying to make an interactive artwork using Arduino and Processing. I am really new at all this,.I know very little about programming but I have to complete this artwork as it is the final task of an intensive program I took part in, which introduced me to interactive arts using Arduino.
  So, for this artwork, I am using an ultrasonic distance sensor to capture the existence of a person in front of it, an Arduino Uno, and of course Processing. Firstly, I want to play a video that only has sound with Processing. When the sensor detects a person at a maximum distance of 50cm, then the first video stops, and a second video starts playing without looping. Right after the second video ends, then the first video starts looping again until the sensor detects another person standing in front.
  So far I have found a code for Arduino and written a code in Processing. The problem is that the first video only plays a few seconds and then the second video starts playing without interacting with the sensor. I have checked the sensor and it functions properly. I have also tested the communication between Arduino and Processing with a premade code and it also works. But I still haven’t found what I do wrong. I would really appreciate any given help!
  Thank you in advance!
  This is the code I run with Arduino, which I found online:
  #include <NewPing.h>
  #define TRIGGER_PIN 10 // Arduino pin tied to trigger pin on the ultrasonic sensor.
  #define ECHO_PIN 9 // Arduino pin tied to echo pin on the ultrasonic sensor.
  #define MAX_DISTANCE 50 //(100); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
  //Serial.print("Ping: ");
  Serial.write(sonar.ping_cm()); // Send ping, get distance in cm and print result (0 = outside set distance range)
  //Serial.println(“cm”);
  }
  And this is a code that I did myself at processing:
  import processing.serial.; //importing serial lib
  import processing.video.;
  Serial arduino;
  int serialIn;
  int val = 49; // Data received from the serial port
  int THRESHOLD = 50;
  Movie sound;
  Movie video;
  void setup() {
  size(500,500);
  printArray(Serial.list());
  arduino = new Serial(this,Serial.list()[1],9600);
  frameRate(25);
  sound= new Movie(this,“keys.mp4”);
  video= new Movie(this,“cross.mov”);
  sound.loop();
  }
  void movieEvent(Movie m) {
  m.read();
  }
  void draw() {
  if(arduino.available()>0)
  {
  serialIn=arduino.read();
  println(serialIn);
  if (val <= THRESHOLD) { //If the sensor detect object at less 10cm sound.stop(); video.play(); image(video,0,0); }
  }
  }