 }
 
 void parse_nunchuk_response() {
-  byte joy_x_axis = buffer[0]; // joystick axe x(0-255)
-  byte joy_y_axis = buffer[1]; // joystick axe y(0-255)
+  byte joy_x_axis = buffer[0]; // joystick X axe (0-255)
+  byte joy_y_axis = buffer[1]; // joystick Y axe (0-255)
   int accel_x_axis = buffer[2] * 4; // acc x
   int accel_y_axis = buffer[3] * 4; // acc y
   int accel_z_axis = buffer[4] * 4; // acc z

boolean calibration_mode = false;
unsigned int calibration_item = 0;

int menu_items_number = 12;
const char* line1_options[3] = {"Angle", "Throttle", "Brake"};
const char* line2_options[2] = {"Throt-Brake", "Angle"};

// non blocking ops times
unsigned long execution_intervals[4][2]; // 4 intervals(servo bluetooth, drawscreen & nunchuk), with 2 values each(duration, last)

/* Main loop */
void loop() {

  draw_menu();

  if (!calibration_mode) {
    acquire_data();
