I already have some code that I am using to play with perlin noise over top of an image and reacting to mouseX and mouseY input. What I want to do now is using a photocell and an Arduino have them control the perlin noise. I am just not sure how to do this. Here is the code I already have:

float noiseScale=0.15;
PImage myImage;
float noiseVal; // took this out of the local variable and made it global

void setup()
  {
    size(600, 650);
    smooth();
    PImage img;
    img = loadImage("rust_1.jpg"); //loads the stored image to the background
    myImage = loadImage("rust_1.jpg");
  }
 
 void draw()
   {
     image(myImage, 0, 0);
     color cp = get(mouseX, mouseY); //use if I want to grab
     stroke(cp, 150);
     for(int x=0; x < width; x++)
     {
      noiseVal = noise((mouseX+x)*noiseScale,
                            mouseY*noiseScale);
   line(x, mouseY+noiseVal*150, x, height);//the higher the value the sharper the spikes
   println (cp);
  }
   }