Lab4: Sensor 2: Force sensors and photocells
Mechanical part - donation piggy bank that calculate money in the bank according to the weight (FSR)
and displays it as strength of a led
Arduino Side
/*
* send data from FSR and Photo senses to a serial port.
* lights a led as a result of darkness
*/
int fsrPin = 0; // select the input pin for the potentiometer
int photoPin = 1; // select the input pin for the potentiometer
int ledPin = 13; // select the pin for the LED
int fsrVal = 0; // variable to store the value coming from the sensor
int photoVal = 0; // variable to store the value coming from the sensor
void setup() {
Serial.begin(9600);
}
void loop() {
fsrVal = analogRead(fsrPin); // read the value from the sensor, between 0 - 1024
photoVal = analogRead(photoPin); // read the value from the sensor, between 0 - 1024
if (fsrVal>=4) Serial.println(String("")+fsrVal + "," + photoVal);
analogWrite(ledPin, (1024-photoVal)/4); // analogWrite can be between 0-255
}
Processing Side - circles painted according to the pressure (circle size) and light (circle color)
/*
* Arduino Ball Paint
* (Arduino Ball, modified 2008)
* ----------------------
*
* Draw balls randomly on the screen, size controlled by a device
* on a serial port. Press space bar to clear screen, or any
* other key to generate fixed-size random balls.
*
* Receives an ASCII number over the serial port,
* terminated with a carriage return (ascii 13) then newline (10).
*
* This matches what Arduino's " Serial.println(val)" function
* puts out.
*
* Created 25 October 2006
* copyleft 2006 Tod E. Kurt <tod@todbot.com
* http://todbot.com/
*/
import processing.serial.*;
// Change this to the portname your Arduino board
String portname = "/dev/tty.usbmodemfd131"; // or "COM5"
Serial port;
String buf="";
int cr = 13; // ASCII return == 13
int lf = 10; // ASCII linefeed == 10
void setup() {
size(300,300);
frameRate(10);
smooth();
background(40,40,40);
noStroke();
port = new Serial(this, portname, 9600);
}
void draw() {
}
void keyPressed() {
background(40,40,40); // erase screen
}
// draw balls
void drawball(int x, int y, int c,int r) {
for (int i=0; i<100; i++ ) {
fill(255-c,c,240);
ellipse(x,y,r,r);
}
}
// called whenever serial data arrives
void serialEvent(Serial p) {
int c = port.read();
if (c != lf && c != cr) {
buf += char(c);
}
if (c == lf) {
int comma = buf.indexOf(",");
int fsrVal = int(buf.substring(0, comma));
int photoVal = int(buf.substring(comma+1));
if (fsrVal > 0) {
int x = int(random(0,width));
int y = int(random(0,height));
drawball(x,y,photoVal/4,fsrVal);
}
buf = "";
}
}
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