LAB4
Description:
for the programming part, I basically change the speed for a bounce ball using the FSR. If there is no force then the speed is zero, I can increase the speed of the ball by pressing the FSR.
for the mechanical part, I put my FSR under my doormat. This will be useful to detect that there is somebody who come in or leave from the front door.
Materials:
Arduino
FSR
Potentiometer
doormat
Arduino Code:
int potPinBlink = 0;
int valBlink = 0;
void setup() // run once, when the sketch starts
{
Serial.begin(9600);
}
void loop() // run over and over again
{
valBlink = analogRead(potPinBlink);
valBlink = map(valBlink, 1, 1022, 0, 40);
Serial.println(valBlink);
}
Processing Code:
import processing.serial.*;
// Change this to the portname your Arduino board
String portname = "COM3"; // or "COM5"
Serial port;
String buf="";
int cr = 13; // ASCII return == 13
int lf = 10; // ASCII linefeed == 10
int size = 60; // Width of the shape
float xpos, ypos; // Starting position of shape
int xspeed = 0; // Speed of the shape
int yspeed = 0; // Speed of the shape
int xdirection = 1; // Left or Right
int ydirection = 1; // Top to Bottom
void setup()
{
size(400, 600);
noStroke();
frameRate(30);
smooth();
// Set the starting position of the shape
xpos = width/2;
ypos = height/2;
port = new Serial(this, portname, 9600);
}
void draw()
{
background(102);
// Update the position of the shape
xpos = xpos + ( xspeed * xdirection );
ypos = ypos + ( yspeed * ydirection );
// Test to see if the shape exceeds the boundaries of the screen
// If it does, reverse its direction by multiplying by -1
if (xpos > width-size || xpos < 0) {
xdirection *= -1;
}
if (ypos > height-size || ypos < 0) {
ydirection *= -1;
}
// Draw the shape
ellipse(xpos+size/2, ypos+size/2, size, size);
}
void serialEvent(Serial p) {
int c = port.read();
if (c != lf && c != cr) {
buf += char(c);
}
if (c == lf) {
int val = int(buf);
println("val="+val);
xspeed = val;
yspeed = val;
buf = "";
}
}
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