Archives for December 3, 2021

Arduino code

const int led=13;
void setup() {
  pinMode(led,OUTPUT);
  Serial.begin(9600);
}
void loop() {
  if(Serial.available()){ 
    char c=Serial.read();
    if(c=='H'){       
      digitalWrite(led,HIGH);
    }
    if(c=='L'){
      digitalWrite(led,LOW);
    }
  }
}

Processing code

import processing.serial.*;
Serial myPort;
void setup() {
  String portName = Serial.list()[0];
  myPort = new Serial(this, portName, 9600);
  size(1000, 1000);
  background(255,255,255);
  fill(255,255,255);
  rectMode(CENTER);
  rect(500,600,500,650);
  fill(240,233,22);
  triangle(500,65,850,275,150,275); 
  strokeWeight(10);
  line(500,275,500,425);
  fill(12,43,165);
  triangle(500,425,400,525,600,525); 
  PFont myfont=createFont("宋体",50);
  textFont(myfont);
  textSize(48);
  text("Eva's home",350,200);
  fill(255,255,255);
  rect(350,400,100,100);
  fill(237,230,86);
  text("on",300,420);
  fill(255,255,255);
  rect(650,400,100,100);
  fill(237,230,86);
  text("off",610,420);  
}
void draw() { 
 if((mouseX>=300)&(mouseX<=400)&(mouseY>=350)&(mouseY<=450)&mousePressed&(mouseButton==LEFT)){
   fill(230,233,22);     
   ellipse(500,600,150,150);
   println("led turn on");
   myPort.write("H");
   }
else if((mouseX>=600)&(mouseX<=700)&(mouseY>=350)&(mouseY<=450)&mousePressed&(mouseButton==LEFT)){
   fill(0,0,0);
   ellipse(500,600,150,150);
   println("led turn off");
   myPort.write("L");
   }
else{
  println("no data");
}
}

Documentation

Q1:Document your work on your blog, detail how your process of building the circuits and writing the code went. Any success? Any failures? What did you learn?

I want to use Processing to realize the effect of turning on and off the light, which reminds me of today’s smart home. People can control the lights in the room and so on. In the Arduino part, I quickly completed the effect of lighting up the LED. But in Processing, it took a little bit of calculation to design the part of the house. I ended up connecting the two, and I failed several times. I learned how to step by step check if my code is correct and successfully connect!

Q2: Use this week’s reading, Computer Vision for Artist and Designers, as inspiration to write a reflection about the ways in which technology was used in your recitation project.

I love Myron Krueger’s Video place, whose concept is that the camera needs to capture the surrounding colors and then send a signal to a light fixture connected to the Arduino. I think this week’s technology makes the connection between Processing and Arduino excellent. I also hope to add some sensors that can correspond well to my project. For example, a response is made in Processing when a hand is waved.

Exercise 1: Make a Processing Etch-A-Sketch

#1 Arduino Code

// 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 sensor1 = analogRead(A0);
  int sensor2 = analogRead(A1);
  int sensor3 = analogRead(A2);

  // send the values keeping this format
  Serial.print(sensor1);
  Serial.print(",");  // put comma between sensor values
  Serial.print(sensor2);
  Serial.print(",");  // put comma between sensor values
  Serial.print(sensor3);
  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(100);

  // end of example sending values
}

#1 Processing Code

// 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;
float x = 0;
float y = 0;

void setup() {
  size(1000, 800);
  background(92, 167, 186);
  setupSerial();
  stroke(255, 66, 93);
  strokeWeight(6);
}

void draw() {
  getSerialData();
  printArray(sensorValues);
  float posx = map(sensorValues[0], 0, 1023, 0, width);
  float posy = map(sensorValues[1], 0, 1023, 0, width);
  line(posx, posy, x, y);
  x = posx;
  y = posy;

  // use the values like this!
  // sensorValues[0] 

  // add your code

  //
}

void setupSerial() {
  printArray(Serial.list());
  myPort = new Serial(this, Serial.list()[ 2 ], 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]);
        }
      }
    }
  }
}

Exercise 2:

#2 Arduino Code

Servo servo1;
Servo servo2;
void setup() {
  Serial.begin(9600);
  servo1.attach(9);
  servo2.attach(10);
}
void loop() {
  getSerialData();
  if (processing_values[0] == 1) {
    servo1.write(90);
  }
  else {
    servo1.write(0);
  }
  if (processing_values[1] == 1) {
    servo2.write(90);
  }
  else {
    servo2.write(0);
  }
}

#2 Processing Code

void setup() {
  background(0);
  setupSerial();
  fullScreen();
}
void draw() {
  background(0);
  noStroke();
  fill(0, 255,255);
  circle(x, height/2, 100);
    x += step;
  if (x<0 || x>width){
    step = -step;
  }
 if (x< 40){
   processing_values[0] = 1;
 }
 else{
   processing_values[0] = 0;
 }
  if (x> width-40){
   processing_values[1] = 1;
 }
 else{
   processing_values[1] = 0;
 }
  sendSerialData();

}

Additional Homework

#3 Arduino Code

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

void loop() {
  int sensor1 = digitalRead(10);
  int sensor2 = digitalRead(11);
  int sensor3 = digitalRead(A2);

  Serial.print(sensor1);
  Serial.print(",");  
  Serial.print(sensor2);
  Serial.print(",");  
  Serial.print(sensor3);
  Serial.println(); 
  delay(100);
}

#3 Processing Code

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;

boolean Star1;
boolean Star2;
int stat1;
int stat2;




void setup() {
  size(1000, 800);   
  setupSerial();   
}

void draw() {
  getSerialData();
  printArray(sensorValues);
  background(200);
  fill(255);
  
  if (Star1){
    star(width*0.3, height*0.3, 30, 70, 5); 
  }
  
  if (stat1==0 && sensorValues[0]==1){
    Star1 = !Star1;
  }
  
  if (Star2){
    star(width*0.7, height*0.7, 80, 100, 40); 
  }
  
  if (stat2==0 && sensorValues[1]==1){
    Star2 = !Star2;
  }
  
  stat1 = sensorValues[0];
  stat2 = sensorValues[1];

  if (mousePressed){      
    background(255);   
  }
  // use the values like this!
  // sensorValues[0] 

  // add your code

  //
}

void star(float x, float y, float radius1, float radius2, int npoints) {
  float angle = TWO_PI / npoints;
  float halfAngle = angle/2.0;
  beginShape();
  for (float a = 0; a < TWO_PI; a += angle) {
    float sx = x + cos(a) * radius2;
    float sy = y + sin(a) * radius2;
    vertex(sx, sy);
    sx = x + cos(a+halfAngle) * radius1;
    sy = y + sin(a+halfAngle) * radius1;
    vertex(sx, sy);
  }
  endShape(CLOSE);
}

void setupSerial() {
  printArray(Serial.list());
  myPort = new Serial(this, Serial.list()[ 2 ], 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]);
        }
      }
    }
  }
}