 #define CMD_AUTO_SCREEN_ON      'C'
 #define CMD_AUTO_SCREEN_OFF     'c'
 #define CMD_SEND_LAST_SCREEN    'E'
+#define CMD_BRIGHTNESS_CURVE      'U'
 
 #define CMD_AUTO_LASER_ON       'L'
 #define CMD_AUTO_LASER_OFF      'l'

  init_vars();
}


void process_command(char cmd) {
  int i;

// for most LEDs.
#define LED_PIN_GREEN 16
#define LED_PIN_RED 17
#define DEBUG_LED2 21

// Pins for the relay based touch probes, collide with LEDs above
#define TOUCH_PIN_A 16
