#include <SoftwareSerial.h>
SoftwareSerial MyBT(2, 3);  // rx tx

char data = '0';
void setup() {
  Serial.begin(9600);
  MyBT.begin(9600);
  pinMode(6, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(12, OUTPUT);
  digitalWrite(6, LOW);
  digitalWrite(8, LOW);
  digitalWrite(12, LOW);
}

void loop() {
  if(MyBT.available()) {
    data = (char)MyBT.read();
    Serial.println(data);

    if(data == 'r') {
      digitalWrite(6, HIGH);
    } else if(data == 'x') {
      digitalWrite(6, LOW);
    }
    if(data == 'g') {
      digitalWrite(8, HIGH);
    } else if(data == 'y') {
      digitalWrite(8, LOW);
    }
    if(data == 'b') {
      digitalWrite(12, HIGH);
    } else if(data == 'z') {
      digitalWrite(12, LOW);
    }
  }
}