serial_led_minecraft/serial_led_minecraft.ino

#include <Adafruit_NeoPixel.h>
#define PIN         9
#define NUMPIXELS      3
int flag=0;
int in_error=0;

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int incomingByte;      // a variable to read incoming serial data into
void setup() {
  // initialize serial communication:
  Serial.begin(9600);
  // initialize the LED pin as an output:
  pixels.begin(); // This initializes the NeoPixel library.
  pixels.setPixelColor(0, pixels.Color(8,9,10)); // Moderately bright green color.
  pixels.show(); // This sends the updated pixel color to the hardware.
  delay (100);
  pixels.setPixelColor(0, pixels.Color(0,0,0)); // Moderately bright green color.
  pixels.show();
}


void loop() {
  // see if there's incoming serial data:
  if (Serial.available() > 0) {
    // read the oldest byte in the serial buffer:
    incomingByte = Serial.read();
  Serial.println(incomingByte);
switch (incomingByte) {
  case 48: //0 = off
     off_();
     break;
  case 84: //T
     tristan();
     break;
  case 86: //V
     valentin();
     break;
  case 69: //E
     ethan();
     break;
  case 50: //2
     two();
     break;
  case 51: //3
     three();
     break;
  case 88: //x
    in_error=1;
     break;    
}
}

if ( in_error == 1)
{
    if (flag == 0){
     pixels.setPixelColor(0, pixels.Color(20,0,0)); // Moderately bright green color.
     pixels.setPixelColor(1, pixels.Color(20,0,0)); // Moderately bright green color.
     pixels.setPixelColor(2, pixels.Color(20,0,0)); // Moderately bright green color.
     pixels.show(); // This sends the updated pixel color to the hardware.
     flag=1 ;
     delay (100);
     }
    if (flag == 1){
     pixels.setPixelColor(0, pixels.Color(0,0,0)); // Moderately bright green color.
     pixels.setPixelColor(1, pixels.Color(0,0,0)); // Moderately bright green color.
     pixels.setPixelColor(2, pixels.Color(0,0,0)); // Moderately bright green color.
     pixels.show(); // This sends the updated pixel color to the hardware.
     flag=0 ;
     delay (300);
     }
}
}