#define SWITCH_LED        2
#define SERIAL_LED        3

#define OFFSET            3
#define LED1              4
#define LED2              5
#define LED3              6
#define LED4              7
#define LED5              8

#define SWITCH            9

/* ====={ T U R N  O N  S E R I A L  L E D }======================= */
inline void turn_on_serial_led( void )
{
   digitalWrite( SERIAL_LED, HIGH );
   digitalWrite( SWITCH_LED, LOW );
}

/* ====={ T U R N  O N  S W I T C H  L E D }======================= */
inline void turn_on_switch_led( void )
{
   digitalWrite( SWITCH_LED, HIGH );
   digitalWrite( SERIAL_LED, LOW );
} 

/* ====={ T U R N  O N  L E D S }================================== */
inline void turn_on_leds( int *num )
{
   static int led_on;
   static int led_off;
   static int last_led;
   
   last_led = *num + OFFSET;
   led_on = LED1;
   
   // Turn on leds
   for( led_on = LED1; led_on < last_led; led_on++ )
      digitalWrite( led_on, HIGH );

   // Like a MIDI note-on message w/a value of 0, turn off leds
   for( led_off = led_on; led_off < last_led; led_off++ )
      digitalWrite( led_off, LOW );
}

/* ====={ T U R N  O N  P R E S S U R E  L E D S }================= */
inline void gauge_pressure( int *pick_value )
{
   static int num_of_leds;

   // Turn on all LEDs
   if( *pick_value >= 109 )
   {
      num_of_leds = 5;
      turn_on_leds( &num_of_leds );
   }

   // Turn on the first 4 LEDs
   if( (*pick_value >= 87) && (*pick_value <= 108) )
   {
      num_of_leds = 4;
      turn_on_leds( &num_of_leds );
   }

   // Turn on the first 3 LEDs
   if( (*pick_value >= 65) && (*pick_value <= 86) )
   {
      num_of_leds = 3;
      turn_on_leds( &num_of_leds );
   }

   // Turn on the first 2 LEDs
   if( (*pick_value >= 43) && (*pick_value <= 64) )
   {
      num_of_leds = 2;
      turn_on_leds( &num_of_leds );
   }

   // Turn on the first LED
   if( (*pick_value >= 21) && (*pick_value <= 42) )
   {
      num_of_leds = 1;
      turn_on_leds( &num_of_leds );
   }

   // Turn off all LEDs
   if( *pick_value < 21 )
   {
      num_of_leds = 0;
      turn_on_leds( &num_of_leds );
   }
}