Problem with converting variable types & serial communication

Projects Programming
4

Alright, got it working. Many thanks, johnwasser! :slight_smile:

For those who are interested, I am working with the Adafruit Neopixel LED strips. Through Processing, I am generating an image out of RGB-values. I use the Adafruit Neopixel Arduino library for driving the LEDs individually, and loop through the serial output from Processing in order to light all the LEDs. Besides that, I loop through a series of images, so the LED strip animates. It's pretty awesome!

The updated code (which includes the library from Adafruit: Arduino Library Use | Adafruit NeoPixel Ãœberguide | Adafruit Learning System) might still need some extra work and fine-tuning, but it is alive and kicking!
Arduino code:

#include <Adafruit_NeoPixel.h>
#define PIN 6

Adafruit_NeoPixel strip = Adafruit_NeoPixel(60, PIN, NEO_GRB + NEO_KHZ800);

uint16_t pixelID = 0;

char inChar = '\0';
int inColor[3] = {0,0,0};
String serialBuffer = "";
int currentColor = 0;
void setup(){
  strip.begin();
  Serial.begin(9600);
  strip.show();
}
void loop(){
  while(Serial.available() > 0){
    inChar = Serial.read();
    if(currentColor < 3){
      if(inChar==','){
        inColor[currentColor] = serialBuffer.toInt();
        currentColor++;
        serialBuffer = ""; 
      }
      else {
        serialBuffer += (char)inChar;
      }
    }
    else {     
      strip.setPixelColor(pixelID,strip.Color(inColor[0],inColor[1],inColor[2]));
      if(pixelID==59){
        strip.show();
        pixelID = 0;
      }
      else {
        pixelID++;
      }
      inColor[0] = 0;
      inColor[1] = 0;
      inColor[2] = 0;
      currentColor = 0;
      
    }
  }
}

Processing code (might still need some optimalization, work in progress):

import processing.serial.*;
Serial port; 
String serial;
PImage[] images = new PImage[8];
String serialPrint = "";
String[] val = new String[8];
String intBetween = "";
int id = 0;

void setup() {
  size(10,6);
  port = new Serial(this, "COM9", 9600);
  port.clear();
  serial = port.readStringUntil(10);
  serial = null;
  for ( int i = 0; i< images.length; i++ )
  {
    images[i] = loadImage("gentle/1-gentle" + i + ".jpg" );
    images[i].loadPixels();
    val[i] = ""; // reset val[i]: remove null value
    for (int y = 0; y < height; y++) {
      for (int x = 0; x < width; x++) {
        int loc = x + y * width;
        val[i] += makeInt(red(images[i].pixels[loc]))+",";
        val[i] += makeInt(green(images[i].pixels[loc]))+",";
        val[i] += makeInt(blue(images[i].pixels[loc]))+",";   
      }
    }
  }
}

void draw(){
  port.write(val[id]);
  id = (id==7) ? 0 : id + 1;
}
int makeInt(Float c){
  intBetween = c.toString();
  int iL = intBetween.length();
  return int(intBetween.substring(0,(iL-2)));
}