Serial Communication Examples

float brightness_led;
void setup() {
  Serial.begin(9600);
  Serial.println("0");
  pinMode(5, OUTPUT);
}
void loop() {
  while (Serial.available()) {
    
    brightness_led = Serial.parseFloat();
    
    if (Serial.read() == '\n') {
    
      analogWrite(5, brightness_led);
      Serial.println(brightness_led);
    }
  }
}

– Processing

import processing.serial.*;
Serial myPort;
int pos_x = 0;
int pos_y;
float brightness_led;
void setup() {
  size(960, 720);
  printArray(Serial.list());
  String portname=Serial.list()[5];
  println(portname);
  myPort = new Serial(this, portname, 9600);
  myPort.clear();
  myPort.bufferUntil('\n');
}
void draw() {
  background(255);
  brightness_led = int(map(mouseX, 0, width, 0, 255));
  
  pos_y = height/2;
  ellipse(mouseX, pos_y, 30, 30);
}
void serialEvent(Serial myPort) {
  String s=myPort.readStringUntil('\n');
  s=trim(s);
  myPort.write(brightness_led+ "\n");
}

 Exercises 3

Take the gravity wind example and make it so every time the ball bounces one led lights up and then turns off, and you can control the wind from one analog sensor

-Processing

PVector velocity;
PVector gravity;
PVector position;
PVector acceleration;
PVector wind;
float drag = 0.99;
float mass = 50;
float hDampening;
int Mover = 0;
import processing.serial.*;
Serial myPort;
int speedWind;
int xPos=0;
int yPos=0;
boolean onOff=false;
void setup() {
  size(640,360);
  printArray(Serial.list());
  String portname=Serial.list()[5];
  println(portname);
  myPort = new Serial(this,portname,9600);
  myPort.clear();
  myPort.bufferUntil('\n');
  
  noFill();
  position = new PVector(width/2, 0);
  velocity = new PVector(0,0);
  acceleration = new PVector(0,0);
  gravity = new PVector(0, 0.5*mass);
  wind = new PVector(0,0);
  hDampening=map(mass,15,80,.98,.96);
}
void draw() {
  background(255);
  if (!keyPressed){
    wind.x= speedWind;
    velocity.x*=hDampening;
  }
  applyForce(wind);
  applyForce(gravity);
  velocity.add(acceleration);
  velocity.mult(drag);
  position.add(velocity);
  acceleration.mult(0);
  ellipse(position.x,position.y,mass,mass);
  if (position.y > height-mass/2) {
      velocity.y *= -0.9;  // A little dampening when hitting the bottom
      position.y = height-mass/2;
    }
    
  
  
  println(velocity.y);
}
  
void applyForce(PVector force){
  // Newton's 2nd law: F = M * A
  // or A = F / M
  PVector f = PVector.div(force, mass);
  acceleration.add(f);
}
void serialEvent(Serial myPort){
  String s=myPort.readStringUntil('\n');
  s=trim(s);
  if (s!=null){
    
    int values[] = int(split(s,','));
    
    
    if (values.length == 2){
      if (values[0] > values[1]){
        speedWind = 10;
      }
      else if (values[0] < values[1]){
        speedWind = -10;
      }
      else if (values[1] == values[1]){
        speedWind = 0;
      }
    }
    
  }
    if (round(position.y + mass) > height && round(velocity.y)  != 0){
    onOff = true;
    }
    else{
      onOff = false;
    }
  
    myPort.write(int(onOff) + "\n");
  
}
void keyPressed(){
  if (keyCode==LEFT){
    wind.x=-1;
  }
  if (keyCode==RIGHT){
    wind.x=1;
  }
  if (key==' '){
    mass= random(15,80);
    position.y=-mass;
    velocity.mult(0);
  }
}

– Arduino

int brightness = 0;
int previousValue = 0;
int moving = 0;
int onOff = 0;
void setup() {
  Serial.begin(9600);
  Serial.println("0");
  pinMode(2, OUTPUT);
  
}
 
void loop() {
  while (Serial.available()) {
    onOff = Serial.parseInt();
    if (Serial.read() == '\n') {
      int sensor = analogRead(A0);
      delay(1);
      
      
      Serial.print(sensor);
      Serial.print(",");
      Serial.println(previousValue);
      previousValue = sensor;
      
      if (onOff == 1){
        analogWrite(2, 255);
      }
      else{
        analogWrite(2, 0);
      }
    }
  }
}