double_up_pixels_example.ino

//***************************************************************
// double up pixels for DMX example
// Once running, open the serial monitor to see what's happening.
//
// Marc Miller, 2015
//***************************************************************
#include "FastLED.h"
#define LED_TYPE NEOPIXEL
#define DATA_PIN 6  // Update for your pin number
#define NUM_LEDS 12  // Update to number of pixels in your LED strip
CRGB leds[NUM_LEDS];

// For DMX, the R,G,B for each pixel will be assigned a channel number, thus:
uint16_t DMXchan = 3*NUM_LEDS;  // Number of DMX channels.
  // Actually, the above would only need to be half of 3*NUM_LEDS since we are
  // doubling pixels up for this test, but I'm not worrying about that.
  
uint16_t pixel = 0;  // for storing a pixel number
uint16_t chanR = 0;  // for storing the Red channel value
uint16_t chanG = 0;  // for storing the Green channel value
uint16_t chanB = 0;  // for storing the Blue channel value


//---------------------------------------------------------------
void setup(){
  delay(1000);  // Power-up delay
  Serial.begin(57600);  // Allows serial monitor output (check baud rate)
  FastLED.addLeds<LED_TYPE,DATA_PIN>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
}


//---------------------------------------------------------------
void loop(){
  Serial.println("...........................................................");
  for (pixel = 0; pixel < NUM_LEDS; pixel++){
    if ((pixel & 0x01) == 0){  // Checks least significant bit to determine if even or odd
      // pixel number is an even
      Serial.print("  pixel "); Serial.print(pixel); Serial.print(" assigned:  ");
      for (uint8_t c = 0; c < 3; c++){
        DMXchan = 3*((pixel+2)/2)-2+c;
        Serial.print("  chan="); Serial.print(DMXchan);
      }
      delay(50);
    } else {
      // pixel number is odd number
      Serial.print("  pixel "); Serial.print(pixel); Serial.print(" assigned:  ");
      for (uint8_t c = 0; c < 3; c++){
        DMXchan = 3*((pixel+1)/2)-2+c;
        Serial.print("  chan="); Serial.print(DMXchan);
      }
      delay(50);
      Serial.println(" ");
    }
    Serial.println(" ");
  }
  delay(200);


  //================================================================
  // Read incoming serial DMX data.
  // Figure out pixel number based on incomming DMX channel number.
  //================================================================

  Serial.println("******[SIMULATING RECEIVING CHANNELS, EACH WITH VALUE 255]******");
  int count = 0;  // Using count to switch between R,G, and B LEDs in each pixel.

  // Starting chan at 1, and adding +1 to DMXchan since DMX protocol has channels start at 1.
  for (uint16_t chan = 1; chan < DMXchan+1; chan++){
    pixel = ((chan+2)/3*2)-2;  // Calculate what pixel the incoming channel belongs to.
    
    Serial.print("  DMXChan "); Serial.print(chan); 
    Serial.print(" goes to pixel "); Serial.print(pixel);

    if (count == 0){
      Serial.print("   Adding R value, and duplicating to pixel "); Serial.print(pixel+1); Serial.println(" ");
      chanR = 255;
      chanG = 0;
      chanB = 0;
    }
    if (count == 1){
      Serial.print("    Adding G value, and duplicating to pixel "); Serial.print(pixel+1); Serial.println(" ");
      chanG = 255;
    }
    if (count == 2){
      Serial.print("     Adding B value, and duplicating to pixel "); Serial.print(pixel+1); Serial.println(" ");
      chanB = 255;
    }
    count++;

    leds[pixel] = CRGB(chanR,chanG,chanB);
    FastLED.show();
    delay(200);
    leds[pixel+1] = CRGB(chanR,chanG,chanB);  // Dublicate color to next pixel
    FastLED.show();
    delay(700);

    if (count == 3){
      leds[pixel] = CRGB::Black;
      leds[pixel+1] = CRGB::Black;
    FastLED.show();
    }
    if (count > 2){count = 0;}
    
  }
  delay(500);
  Serial.println(" ");


}  // ----End main loop----