使用 Arduino-Processing 连接和 ADXL345 传感器显示图像

Question

I am working on an artistic project that includes an ADXL345 sensor (accelerometer), Arduino Uno R3 Board, Arduino IDE 2.0.3 and Processing 4.1.2. I want Processing to display images randomly and continuously every time the values of the sensor that are received from the serial communication with the Arduino sketch, go x>5, x<-5, y.5, y.-5, z>1, z<-1.

UPDATE: A friend helped me with some lines of code and now the image being displayed when I move the sensor.

CHALLENGE: What I want to be able to do now is run the processing sketch ONCE and let the windows containing the images pop up, close down, open new windows and display new random images from my folder. For this process to repeat on itself so I don't have to run the sketch manually every time.

These are the codes that I am using in Arudino and Processing.

ARDUINO

void setup() {
  // initialize serial communication at 9600 baud rate
  Serial.begin(9600);
}

void loop() {
  // send x, y, and z values over serial
  int x = analogRead(A0);
  int y = analogRead(A1);
  int z = digitalRead(2);
  Serial.print(x);
  Serial.print(",");
  Serial.print(y);
  Serial.print(",");
  Serial.println(z);
  delay(1000);
}

& PROCESSING

import processing.serial.*;
Serial mySerial;
PImage fragment;
int rand;

void setup() {
  size(1000, 500);
  rand = int(random(0,133)); 
  takerandomimage("C:/Users/user/Documents/Processing/Trial_300123/frag_" + nf(rand, 3) + ".jpg");
  String portName = Serial.list()[0];
  mySerial = new Serial(this, portName, 9600);
  println("Serial port connected: " + portName);
  loop();
}

void takerandomimage(String fn) {
   fragment = loadImage(fn); 
   println(fragment);
}

void draw() {
  background(255); //clears the screen
  if (fragment.width>0 && fragment.height > 0){ //check if image has been loaded
    String data = mySerial.readStringUntil('\n');
    if (data != null && data != "\n" && data != " " && data != "\r" && data != "\t") {
      println("Data received: " + data);
      String[] values = data.split(" ",0);
      int counter = 0;
      int x = 0;
      int y = 0;
      int z = 0;
      for(String w :values){
         System.out.println(w); 
         if (counter == 1)
         x = int(w);
        if ( counter == 4)
         y = int(w);
        if ( counter == 7)
         z = int(w);
        counter++;
        }
        println(x);
        println(y);
        println(z);
      if (x < 0 || y > 0 || z > 0) {
          takerandomimage("C:/Users/user/Documents/Processing/Trial_300123/frag_" + nf(rand, 3) + ".jpg");
          image(fragment, 0,0);
          delay(1000);
        }
      }
    }
  }

Thank you!!

Answer 1

So many things are right with your code (and question)(+1):

• your question mentions version of the Arduino/Processing used, Arduino board, sensor and also includes minimal code focused on the issue
• checking if data is not null
• checking if the split array is right length, etc.

You are so close !

There is one issue throwing off parsing:

• your Processing code assumes you have the x, y, z values one line: String data = mySerial.readStringUntil('\n');
• your Arduino code is printling mulitple lines instead of one(eg Serial.println(x); instead of Serial.print(x) )
• to double check, you would see x, y, z values (as well as the two "," symbols) in Serial Monitor on separate lines each (instead of all on one line)

I suspect the intention was to use println() only on the last line:

void setup() {
  // initialize serial communication at 9600 baud rate
  Serial.begin(9600);
}

void loop() {
  // send x, y, and z values over serial
  int x = analogRead(A0);
  int y = analogRead(A1);
  int z = digitalRead(2);
  Serial.print(x);
  Serial.print(",");
  Serial.print(y);
  Serial.print(",");
  Serial.println(z);
  delay(1000);
}

(The above should print 3 values separated by "," on a single line. Double check if z should be a digitalRead(2) (returning 1 or 0) reading on pin 2 on your Arduino or analogRead(A2) (returning 0 to 1023) reading analog pin A2.)