#include <SoftwareSerial.h>

SoftwareSerial HEXISerial (1, 0); // RX (PA1), TX (PA0)

#define led1 5  //MISO (PA5) YELLOW
#define led2 4  //SCK (PA4) WHITE
#define led3 6  //MOSI (PA6) BUZZER/RED

char val;

void setup()
{
  HEXISerial.begin(9600);
  
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop()
{
  if ( HEXISerial.available() )
  {
    val = HEXISerial.read();
  }
  
  if (val == '1')
  {
    HEXISerial.println("YELLOW LEDs ON!");
    
    digitalWrite(led1, HIGH);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
  }

  if (val == '2')
  {
    HEXISerial.println("WHITE LEDs ON!");
    
    digitalWrite(led1, LOW);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, LOW);
  }

  if (val == '3')
  {
    HEXISerial.println("RED LEDs & BUZZER ON!");
    
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, HIGH);
  }

   if (val == '4')
  {
    HEXISerial.println("ALL ON!");
    
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
  }

  if (val == '5')
  {
    HEXISerial.println("ALL OFF!");
    
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
  }
}