Assignment 4: The image brigthener
Description
In this assignment I used the 'Brightness' example from the Processing Library. I added my own picture to the example, adjusted the values in the code the picture is in colors (instead of black / white) and made the bulb/brightener a fixed value, so I can control it with my FSR. Now, the bulb/brightener change and light up the picture according to the values (or pressure) it receives from the FSR.
Components
- Arduino
- Breadboard
- USB cable
- Cables
- Resistor
- Force sensing resistor (FSR)
- Carton and tape
Arduino code
/*
* one pot fades one led
* modified version of AnalogInput
* by DojoDave <http://www.0j0.org>
* http://www.arduino.cc/en/Tutorial/AnalogInput
*/
int potBrightness = A0; // select the input pin for the potentiometer (styre brightness)
int potBlink = A1; // select the input pin for the potentiometer (styre blink)
int ledBlue = 11; // select the pin for the LED
int ledGreen = 10;
int ledRed = 9;
int value = 0; // variable to store the value coming from the sensor
void setup() {
Serial.begin(9600);
}
void loop() {
value = analogRead(potBrightness); // read the value from the sensor, between 0 - 1024
value = map (value, 0,1023,255,0); //converts value scale 1023 to 255
Serial.println(value);
analogWrite(ledBlue, value/4); // analogWrite can be between 0-255
analogWrite(ledGreen, value/4); // analogWrite can be between 0-255 // turns on, do not need to declare HIGH
analogWrite(ledRed, value/4); // analogWrite can be between 0-255 // turns on, do not need to declare HIGH
delay (100);
}
Processing code
import processing.serial.*;
PImage img;
Serial port;
float inputValue = 0;
void setup()
{
//size (500,500);
size(640, 478);
img = loadImage("light.JPG");
img.loadPixels();
// Only need to load the pixels[] array once, because we're only
// manipulating pixels[] inside draw(), not drawing shapes.
loadPixels();
port = new Serial(this, Serial.list()[0], 9600);
port.bufferUntil ('\n'); //not sure about this one
}
void draw(){
for (int x = 0; x < img.width; x++) {
for (int y = 0; y < img.height; y++ ) {
// Calculate the 1D location from a 2D grid
int loc = x + y*img.width;
// Get the R,G,B values from image
float r,g,b;
r = red (img.pixels[loc]);
g = green (img.pixels[loc]);
b = blue (img.pixels[loc]);
// Calculate an amount to change brightness based on proximity to the mouse
float maxdist = inputValue;//
float d = dist(x, y, mouseX, mouseY);
float adjustbrightness = 255*(maxdist-d)/maxdist;
r += adjustbrightness;
g += adjustbrightness;
b += adjustbrightness;
// Constrain RGB to make sure they are within 0-255 color range
r = constrain(r, 0, 255);
g = constrain(g, 0, 255);
b = constrain(b, 0, 255);
// Make a new color and set pixel in the window
color c = color(r, g, b);
//color c = color(r);
pixels[y*width + x] = c;
}
}
updatePixels();
}
void serialEvent (Serial port)
{
inputValue = float(port.readStringUntil('\n')); //read value from FSR
println(inputValue); //print value
}
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