Assignment: Sensing PART II: Force sensors and photocells
Collaborators:
Assignment: Sensing PART II: Force sensors and photocells
Collaborators:
Assignment: Sensing PART II: Force sensors and photocells
Collaborators:
In this project I rigged up a force sensor under a beer coaster. The idea is that the force sensor would read the amount of beer in the bottle and display the amount graphically on screen by showing an image of a beer bottle with the liquid level clearly marked. It worked! If I use a straw to suck up the beer, the level of the screen liquid moves at pace with the level in the bottle. I have enclosed a screen shot. beercoaster.jpg
/**
* Beer Coaster.
*
* Show the amount of beer left in the bottle by measuring the pressure on the coaster.
*/
import processing.serial.*;
PImage bg;
PImage whiteness;
int a;
// Change this to the portname your Arduino board
String portname = "/dev/cu.usbserial-A7006yVV"; // or "COM5"
Serial port;
String buf="";
int cr = 13; // ASCII return == 13
int lf = 10; // ASCII linefeed == 10
void setup()
{
size(200,200);
frameRate(30);
// is 200 x 200 pixels.
bg = loadImage("beerbottle.gif");
whiteness = loadImage("white.jpg");
port = new Serial(this, portname, 9600);
}
void draw()
{
//background(bg);
}
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);
drawBeer(val);
buf = "";
}
}
// draw beer level
void drawBeer(int r) {
background(255,204,0);
//the whiteness image moves up or down depending on the level of liquid in the bottle
image(whiteness, 0, -(r-670));
//the bg image is a gif with a transparency in the shape of a bottle.
image(bg, 0, 0);
}
