Recitation 8: Serial Communication

I successfully made it by myself! Good job!

Coding part:

Processing:

// IMA NYU Shanghai
// Interaction Lab
// For receiving multiple values from Arduino to Processing

/*
 * Based on the readStringUntil() example by Tom Igoe
 * https://processing.org/reference/libraries/serial/Serial_readStringUntil_.html
 */

import processing.serial.*;


int NUM_OF_VALUES_FROM_ARDUINO = 3;   /** YOU MUST CHANGE THIS ACCORDING TO YOUR PROJECT **/
int sensorValues[];      /** this array stores values from Arduino **/

String myString = null;
Serial myPort;

void setup() {
  size(500, 500);
  background(122);
  setupSerial();
}

void draw() {
  getSerialData();
  printArray(sensorValues);

  stroke(255);
  circle(sensorValues[0]/4, sensorValues[1]/4, 4);
  // use the values like this!
  // sensorValues[0] 

  // add your code

  //
}

void setupSerial() {
  printArray(Serial.list());
  myPort = new Serial(this, Serial.list()[ 3 ], 9600);
  // WARNING!
  // You will definitely get an error here.
  // Change the PORT_INDEX to 0 and try running it again.
  // And then, check the list of the ports,
  // find the port "/dev/cu.usbmodem----" or "/dev/tty.usbmodem----" 
  // and replace PORT_INDEX above with the index number of the port.

  myPort.clear();
  // Throw out the first reading,
  // in case we started reading in the middle of a string from the sender.
  myString = myPort.readStringUntil( 10 );  // 10 = '\n'  Linefeed in ASCII
  myString = null;

  sensorValues = new int[NUM_OF_VALUES_FROM_ARDUINO];
}

void getSerialData() {
  while (myPort.available() > 0) {
    myString = myPort.readStringUntil( 10 ); // 10 = '\n'  Linefeed in ASCII
    if (myString != null) {
      String[] serialInArray = split(trim(myString), ",");
      if (serialInArray.length == NUM_OF_VALUES_FROM_ARDUINO) {
        for (int i=0; i<serialInArray.length; i++) {
          sensorValues[i] = int(serialInArray[i]);
        }
      }
    }
  }
}

Arduino:

// IMA NYU Shanghai
// Interaction Lab
// For sending multiple values from Arduino to Processing


void setup() {
  Serial.begin(9600);
}

void loop() {
  // to send values to Processing assign the values you want to send
  //this is an example
  int sensor0 = analogRead(A0);
  int sensor1 = analogRead(A1);

  // send the values keeping this format
  Serial.print(sensor0);
  Serial.print(",");  // put comma between sensor values
  Serial.print(sensor1);
  Serial.print(",");  // put comma between sensor values
  Serial.println(); // add linefeed after sending the last sensor value

  // too fast communication might cause some latency in Processing
  // this delay resolves the issue.
  delay(0);

  // end of example sending values
}

The final project:

(I try to upload the whole video but I failed)

To improve it, I thought I should made the line being drew more smoothly. The problem solving way may be making the coordinate points more accurately.