Components

• FSR
• Photocell
• 10k resistor
• LEDs
• Arduino board
• Bread board
• Wires

In lab exercise

For the in-lab exercise, i have tried plugging in FSR and photo cells on the breadboard. Using the code for Lab-3, I can control the brightness and blinking rate with those two sensors. Here arethe demo pictures.

Homework-1 Visualizaiton

Code on Arduino 

int potPin = 0;   // select the input pin for the potentiometer
int ledPin = 10;   // select the pin for the LED
int val = 0;      // variable to store the value coming from the sensor
void setup() {
  Serial.begin(9600);
}
void loop() {
  val = analogRead(potPin);    // read the value from the sensor, between 0 - 1024
   Serial.println(val/4, DEC);
  analogWrite(ledPin, val/4); // analogWrite can be between 0-255
}

Code on Processing

import processing.serial.*;

// Change this to the portname your Arduino board
String portname = "COM4"; // or "COM5"

Serial port;
String buf="";
int cr = 13;  // ASCII return   == 13
int lf = 10;  // ASCII linefeed == 10

int maxNum = 50;
int num = 0;
void setup() {
  size(600,600);
  frameRate(10);
  smooth();
  background(40,40,40);
  noStroke();
  port = new Serial(this, portname, 9600);
}

void draw() {
}

void keyPressed() {
}

// draw a ball
void drawball(int x, int y, int r) {
  ellipse(x,y, r,r);
}

// called whenever serial data arrives
void serialEvent(Serial p) {
 int value;
 if (port.available() > 0) {
   String myString = port.readStringUntil(lf);
   if (myString != null) {
     //print(myString.substring(0, myString.length()-2));
     value = int(myString.substring(0, myString.length()-2));
    //value = int(myString);
 
     int sign = 1;
             println(""+value);
     if (value > 0) {

        int x = int(random(0,width));
        int y = int(random(0,height));
        if (int(random(0,1)) == 0)
          sign = -1;
        drawball(x,y,value+sign*int(random(0,10)));
 
        if (++num == maxNum) {
          background(40,40,40);
          num = 0;
        }
     }
   } 
 }
}