LEDdressing.ino

// Takes input from an RPi to light up LEDs on the Moonboard.
 
#include <Adafruit_NeoPixel.h>

#define PIN      6
#define N_LEDS   198

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

void setup() 
{
  // Opens serial connection.
  Serial.begin(9600);
  
  // Initializes our LEDs.
  strip.begin();
  strip.show();
}

// Color: (G, R, B).
// The syntax below:> uint32_t color = strip.Color(G, R, B)
// allows the listed color to be called via:> strip.setPixelColor(n, color)

// Basics. 
uint32_t green = strip.Color(255, 0, 25);
uint32_t red   = strip.Color(0, 255, 75);
uint32_t blue  = strip.Color(100, 0, 255);
uint32_t off   = strip.Color(0, 0, 0);

// Some fun ones...
uint32_t pmMajesty = strip.Color(0, 100, 200);
uint32_t turquoise = strip.Color(100, 0, 200);
uint32_t fuscia    = strip.Color(0, 200, 100);
uint32_t borderlineTeal = strip.Color(230, 0, 50);

void loop()
{ 
  // Takes input from RPi serial connection.

  if (Serial.available() == 3) 
  {
    char color = Serial.read();
    int LEDnum = Serial.read() + Serial.read();

    lightUpHold(LEDnum, color);
  }     
  else if (Serial.available() > 3)
  {
    while (Serial.available() > 0)
    {
      Serial.read();
    }
  }
  strip.show();
}

void lightUpHold(int n, char charCol)
{
    uint32_t charColor = off;
    
    //Takes first three digits of serialInput and 
    switch (charCol) 
    {    
      // If the Arduino receives a 'G' char over serial, sets addressed pixel to green.
      case 'G':
        charColor = green;
        Serial.print("green");
        break;
    
      // If the Arduino receives a 'R' char over serial, sets addressed pixel to red. 
      case 'R':
        charColor = red;
        break;
    
      // If the Arduino receives a 'B' char over serial, sets addressed pixel to blue.
      case 'B':
        charColor = blue;
        break;
        
      // If no character is received, defaults to off.
      case 'o':
        charColor = off;
        break;

      // If upper case 'O' is received, turns off all pixels.
      case 'O':
        strip.clear();
        break;

      // Leaves room for plenty more colors in future updates :)
    }
    // Lights an LED using its received address and color.
    if ((n >= 0) && (n < 198))
    {
      Serial.print(n);
      strip.setPixelColor(n, charColor);
    }
}