Need Help - Arduino output value to drive image.

zlr102

Need Help - Arduino output value to drive image.

in Integration and Hardware • 2 years ago

Hello,

I am an extreme novice at Processing... correction, I have never used it before. I have a project that requires me to measure the weight of an object and display an image depending on the weight range. I have already built and tested the hardware. Basically an arduino board connected to four force sensors and plugged into my mac via USB. The force sensors output a value between 0 and 1023 depending on the weight of the object being weighed.

From here I need to write a simple program that uses this value to display an image (jpeg or similar). So if the value falls between 0 and 250 then image A is displayed, if between 251 and 500 image B is displayed... etc. Also needs to live update, so if I remove the object the image should change and if I re-place it, the image should return.

Does anyone know where I can find sample code to do this, or if someone thinks they can write some quick code to do this I would be grateful.

Please help. Thanks. Let me know if you need any more information.

-Zach

Replies(1)

Octomo

Re: Need Help - Arduino output value to drive image.

2 years ago

you should upload standardFirmata to your arduino, then use the arduino library in processing, to read you arduino's output. once you know the basic, it's pretty simple, here's the library and some info.

http://www.arduino.cc/playground/Interfacing/Processing

and how are the 4 sensors used?

well, here's an example for a sensor on analog pin 0

import cc.arduino.*;
import processing.serial.*;
Arduino a;
void setup(){
size(500,500);
a=new Arduino(this,Arduino.list()[0],57600);
}
int thrshld;
void draw(){
thrshld=a.analogRead(0); //read the analog pin 0 and store the value in int thrshld
if(thrshld<=250){//if analogRead < or = 250
background(0);
}
if(thrshld<500&&thrshld>250){//if analogRead >250 and (&&) <500
background(100);
}
if(thrshld>500){if analogRead>500
background(255);
}
}

if you want jpgs you could use PImages.

http://processing.org/reference/image_.html

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