     
     servo_virt.attach(SERVO_PIN_VIRT);
     servo_horz.attach(SERVO_PIN_HORZ);
+    
+    servo_virt.write(90);
+    servo_horz.write(90);
 }
 
 void loop()

#define PIN_LDR_DOWN  1 // PC1
#define PIN_LDR_LEFT  2 // PC2
#define PIN_LDR_RIGHT 3 // PC3
#define THRESHOLD_LDR_VIRT 20
#define THRESHOLD_LDR_HORZ 20

#define SERVO_PIN_VIRT 8 // PB0
#define SERVO_PIN_HORZ 9 // PB1

    Serial.print(left); 
    Serial.print(':');
    Serial.print(right); 
    
    int diff = left - right
    ;
    if (abs(diff) > THRESHOLD_LDR_HORZ) {
      return diff;
    }
    
