Array of temperature values --> thermal image?

Programming Questions

mgssnake

Array of temperature values --> thermal image?

in Programming Questions • 1 years ago

Basically I have a grid of sensors like this:

.      .      .      .      .      .      .
.      .      .      .      .      .      .
.      .      .      .      .      .      .
.      .      .      .      .      .      .
.      .      .      .      .      .      .

etc. It's a grid of 31 x 12 sensors xD

Currently I've figured out how to program the Arduino to convert adc data to temperature values. I used Processing to create a GUI interface and log the data into a text file. I also have Processing reading the temperature values from the text files and storing them into arrays. I'm just having trouble figuring out how I could create a thermal image from the sensor values. I'm new to Processing but not programming. Any help or ideas would be greatly appreciated.

Replies(2)

amnon.owed

Re: Array of temperature values --> thermal image?

1 years ago

Two ideas:

Use the pixel array.
Use a vertex-colored Shape.

Here is a quick example of the second idea.

import processing.opengl.*;
int numRows = 12;
int numCols = 31;
float rowHeight, colWidth;
float[][] values = new float[numRows][numCols];
void setup() {
size(1280, 720, OPENGL);
rowHeight = (float) height / (numRows-1);
colWidth = (float) width / (numCols-1);
colorMode(HSB, 360, 100, 100, 100);
noStroke();
}
void draw() {
updateValues();
displayValues();
}
void updateValues() {
for (int y=0; y<numRows; y++) {
for (int x=0; x<numCols; x++) {
float d = map(dist(mouseX, mouseY, x*colWidth, y*rowHeight), 0, width/4, 1, 0);
values[y][x] = sin(frameCount*0.02 + noise(x+y, y) * d) * 360;
}
}
}
void displayValues() {
for (int y=0; y<numRows-1; y++) {
beginShape(TRIANGLE_STRIP);
for (int x=0; x<numCols; x++) {
float c = values[y][x];
float px = x * colWidth;
float py = y * rowHeight;
float cn = values[min(y+1, numRows-1)][x];
float ny = (y+1) * rowHeight;
fill(c, 75, 100);
vertex(px, py);
fill(cn, 75, 100);
vertex(px, ny);
}
endShape();
}
}

mgssnake

Re: Re: Array of temperature values --> thermal image?

1 year ago

That looks really cool! Thanks, I'll see what I can do.

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