Exercise 1:
P5 code:
let rVal = 0;
let alpha = 255;
let left = 0; // True (1) if mouse is being clicked on left side of screen
let right = 0; // True (1) if mouse is being clicked on right side of screen
function setup() {
createCanvas(640, 480);
textSize(18);
}
function draw() {
// one value from Arduino controls the background's red color
background(255)
// the other value controls the text's transparency value
fill(255, 0,0)
if (!serialActive) {
text("Press Space Bar to select Serial Port", 20, 30);
} else {
text("Connected", 20, 30);
// Print the current values
text('rVal = ' + str(rVal), 20, 50);
text('alpha = ' + str(alpha), 20, 70);
}
// click on one side of the screen, one LED will light up
// click on the other side, the other LED will light up
if (mouseIsPressed) {
if (mouseX > rVal-50 && mouseX < rVal+50 && mouseY > height/2-50 && mouseY < height/2+50) {
right = 1;
}
} else {
right = 0;
}
ellipse(rVal, height/2, 50,50)
}
function keyPressed() {
if (key == " ") {
// important to have in order to start the serial connection!!
setUpSerial();
}
}
// This function will be called by the web-serial library
// with each new line of data. The serial library reads
// the data until the newline and then gives it to us through
// this callback function
function readSerial(data) {
////////////////////////////////////
//READ FROM ARDUINO HERE
////////////////////////////////////
if (data != null) {
// make sure there is actually a message
// split the message
let fromArduino = split(trim(data), ",");
// if the right length, then proceed
if (fromArduino.length == 2) {
// only store values here
// do everything with those values in the main draw loop
// We take the string we get from Arduino and explicitly
// convert it to a number by using int()
// e.g. "103" becomes 103
rVal = int(fromArduino[0]);
alpha = int(fromArduino[1]);
}
//////////////////////////////////
//SEND TO ARDUINO HERE (handshake)
//////////////////////////////////
let sendToArduino = left + "," + right + "\n";
writeSerial(sendToArduino);
}
}
We did not face any big issue in this part. We just added the ellipse and changed its position to rVal, height/2.
Video:
Exercise 2:
P5 code:
let rVal = 0;
let alpha = 255;
let left = 0; // True (1) if mouse is being clicked on left side of screen
let right = 0; // True (1) if mouse is being clicked on right side of screen
function setup() {
createCanvas(640, 480);
textSize(18);
}
function draw() {
// one value from Arduino controls the background's red color
background(map(rVal, 0, 1023, 0, 255), 255, 200);
// the other value controls the text's transparency value
fill(255, 0, 255, map(alpha, 0, 1023, 0, 255));
if (!serialActive) {
text("Press Space Bar to select Serial Port", 20, 30);
} else {
text("Connected", 20, 30);
// Print the current values
text('rVal = ' + str(rVal), 20, 50);
text('alpha = ' + str(alpha), 20, 70);
}
function keyPressed() //built in function
{
if (key == " ") //if space is pressed then
{
setUpSerial(); //setup the serial.
}
else if (keyCode == DOWN_ARROW)
{
if (right != 0)
{
right = right - 20;
}
}
else if (keyCode == UP_ARROW)
{
if (right != 250)
{
right = right + 20;
}
}
}
}
// This function will be called by the web-serial library
// with each new *line* of data. The serial library reads
// the data until the newline and then gives it to us through
// this callback function
function readSerial(data) {
////////////////////////////////////
//READ FROM ARDUINO HERE
////////////////////////////////////
if (data != null) {
// make sure there is actually a message
// split the message
let fromArduino = split(trim(data), ",");
// if the right length, then proceed
if (fromArduino.length == 2) {
// only store values here
// do everything with those values in the main draw loop
// We take the string we get from Arduino and explicitly
// convert it to a number by using int()
// e.g. "103" becomes 103
rVal = int(fromArduino[0]);
alpha = int(fromArduino[1]);
}
//////////////////////////////////
//SEND TO ARDUINO HERE (handshake)
//////////////////////////////////
let sendToArduino = left + "," + right + "\n";
writeSerial(sendToArduino);
}
}
Arduino code for Exercise 1 and 2:
int leftLedPin = 2;
int rightLedPin = 5;
void setup() {
// Start serial communication so we can send data
// over the USB connection to our p5js sketch
Serial.begin(9600);
// We'll use the builtin LED as a status output.
// We can't use the serial monitor since the serial connection is
// used to communicate to p5js and only one application on the computer
// can use a serial port at once.
pinMode(LED_BUILTIN, OUTPUT);
// Outputs on these pins
pinMode(leftLedPin, OUTPUT);
pinMode(rightLedPin, OUTPUT);
// Blink them so we can check the wiring
digitalWrite(leftLedPin, HIGH);
digitalWrite(rightLedPin, HIGH);
delay(200);
digitalWrite(leftLedPin, LOW);
digitalWrite(rightLedPin, LOW);
// start the handshake
while (Serial.available() <= 0) {
digitalWrite(LED_BUILTIN, HIGH); // on/blink while waiting for serial data
Serial.println("0,0"); // send a starting message
delay(300); // wait 1/3 second
digitalWrite(LED_BUILTIN, LOW);
delay(50);
}
}
void loop() {
// wait for data from p5 before doing something
while (Serial.available()) {
digitalWrite(LED_BUILTIN, HIGH); // led on while receiving data
int left = Serial.parseInt();
int right = Serial.parseInt();
if (Serial.read() == '\n') {
digitalWrite(leftLedPin, left);
digitalWrite(rightLedPin, right);
int sensor = analogRead(A0);
delay(5);
int sensor2 = analogRead(A1);
delay(5);
Serial.print(sensor);
Serial.print(',');
Serial.println(sensor2);
}
}
digitalWrite(LED_BUILTIN, LOW);
}
Challenges:
We tried to get the light to decrease its brightness every time the person would click on the left side of the screen and for the brightness to increase whenever the person clicks on the right side of the screen. The code was correct, but for some reason it was not working. So, it might be something with the bulb or the Arduino itself. However, the light does take around 4 clicks on both sides of the screen to turn off or on so, we would consider that a success.
Video:
Exercise 3:
P5 code:
let dragForce = 0.99;
let mass = 20;
let ledState = 0;
let velocity;
let gravity;
let position;
let acceleration;
let wind;
let force;
let bounced = false;
function setup() {
createCanvas(640, 480);
textSize(18);
position = createVector(width / 2, 0);
velocity = createVector(0, 0);
acceleration = createVector(0, 0);
gravity = createVector(0, 0.3 * mass);
wind = createVector(0, 0);
}
function draw() {
background(255);
if (!serialActive) {
text("Press Space Bar to select Serial Port", 20, 30);
} else {
text("Connected", 20, 30);
noStroke();
force = p5.Vector.div(wind, mass);
acceleration.add(force);
force = 0;
force = p5.Vector.div(gravity, mass);
acceleration.add(force);
force = 0;
velocity.add(acceleration);
velocity.mult(dragForce);
position.add(velocity);
acceleration.mult(0);
ellipse(position.x, position.y, mass, mass);
if (position.y > (height - mass / 2)-30 ) {
velocity.y *= -0.9;
position.y = (height - mass / 2)-30;
ledState= 1;
if (!bounced) {
fill('blue'); // Red when just bounced
bounced = true; // Update bounce state
} else {
fill('red'); // White otherwise
bounced = false; // Reset bounce state
}
} else {
ledState = 0;
}
}
rect(0,height-30,width,30);
}
function keyPressed() {
if (key == " ") {
// important to have in order to start the serial connection!!
setUpSerial();
}
}
function readSerial(data) {
if (data != null) {
// make sure there is actually a message
// split the message
let fromArduino = split(trim(data), ",");
// if the right length, then proceed
if (fromArduino.length == 1) {
let windCurrent = int(fromArduino[0]);
wind.x = map(windCurrent, 0, 1023, -1, 1);
}
//////////////////////////////////
//SEND TO ARDUINO HERE (handshake)
//////////////////////////////////
let sendToArduino = ledState + "\n";
writeSerial(sendToArduino);
}
}
Arduino code:
int ledPin = 10;
int potPin = A0;
void setup() {
Serial.begin(9600);
pinMode(LED_BUILTIN, OUTPUT);
// Outputs on these pins
pinMode(ledPin, OUTPUT);
// start the handshake
while (Serial.available() <= 0) {
digitalWrite(LED_BUILTIN, HIGH); // on/blink while waiting for serial data
Serial.println("0"); // send a starting message
delay(300); // wait 1/3 second
digitalWrite(LED_BUILTIN, LOW);
delay(50);
}
}
void loop() {
// wait for data from p5 before doing something
while (Serial.available()) {
digitalWrite(LED_BUILTIN, HIGH); // led on while receiving data
int right = Serial.parseInt();
if (Serial.read() == '\n') {
digitalWrite(ledPin, right);
int potValue = analogRead(potPin);
delay(5);
Serial.println(potValue);
}
}
}
Challenges:
Everything went smoothly when writing the code. However, when we would click the play button to see the sketch, it would give us the error: “setUpArduino is not defined”. So, we spent countless minutes searching for something that was not there. After looking at the professors week 12 example on serial connection, we realized that we have forgotten the tab that would connect P5 to Arduino. So we just added that and it worked.
Video:
very very cute :3