Lab 4- FSR
Description:
I worked on the two components, ie the visual and the mechanical ones separately.
I first visualized the force applied on the FSR and the use of the pot by a simple line graph.
For the mechanical part, I built a "metal detector" which would use the force applied by materials attracted to a magnet which I attached to the FSR. There would be an "ALERT" message on the computer screen, as well as an LED light attached to the circuit would start blinking upon contact.
Materials:
-FSR
- Potentiometers
-magnets
- LED
Arduino code part 1
void setup() {
// initialize the serial communication:
Serial.begin(9600);
pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
}
void loop() {
// send the value of analog input 0:
Serial.println(analogRead(A0));
// wait a bit for the analog-to-digital converter
// to stabilize after the last reading:
delay(10);
}
Processing Part 1
import processing.serial.*;
Serial port;
int XPos = 10;
void setup(){
size(600,255);
port = new Serial(this, "COM3", 9600);
port.bufferUntil('\n');
background(0);
}
void draw(){
}
void serialEvent (Serial port) {
String inString = port.readStringUntil('\n');
if (inString != null) {
inString = trim(inString);
float inByte = float(inString);
inByte = map(inByte, 0, 1023, 0, height);
stroke(inByte,0,255);
noFill();
line(XPos, height - inByte, XPos, height);
if (XPos >= width) {
XPos = 0;
background(0);
}
else {
XPos++;
}
}
}
Arduino Part 2
int ledPin = 11;
int val=0;
void setup() {
// initialize the serial communication:
Serial.begin(9600);
pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
}
void loop() {
// send the value of analog input 0:
Serial.println(analogRead(A0));
// wait a bit for the analog-to-digital converter
// to stabilize after the last reading:
delay(10);
val = analogRead(analogRead(A0)); // read the value from the sensor
digitalWrite(ledPin, HIGH); // turn the ledPin on
delay(val); // stop the program for some time
digitalWrite(ledPin, LOW); // turn the ledPin off
delay(val);
}
Processing Part 2
/*
* Arduino Metal Detector
*
* ----------------------
*
* Uses an FSR attached to a magnet to detect metallic/magnetic materials.
* Displays messages to the user when these materials are detected
*
* 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.
*
* Modified from the Bouncing Ball Paint Code
* http://todbot.com/
*/
import processing.serial.*;
String portname = "COM3";
Serial port;
String buf="";
int cr = 13; // ASCII return == 13
int lf = 10; // ASCII linefeed == 10
void setup() {
size(600,600);
frameRate(10);
smooth();
background(40,40,40);
noStroke();
port = new Serial(this, portname, 9600);
}
void draw() {
}
// 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 val = int(buf);
println("val="+val);
buf = "";
background(40,40,40); // erase screen
if (val>0)
{
textSize(50);
text("ALERT!",50,250 );
text("METAL FOUND!!!",50,350 );
}
else
{ textSize(30);
text("DETECTING.....",50,50 );
}
}
}
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