     int left = analogRead(PIN_LDR_LEFT);
     int right = analogRead(PIN_LDR_RIGHT);
     
-    /*
+    
     Serial.print(left); 
     Serial.print(':');
-    Serial.print(right); 
-    */
+    Serial.println(right); 
+    
     
     int diff = left - right;
     if (abs(diff) > THRESHOLD_LDR_HORZ) {

    
    pinMode(LED_DEBUG, OUTPUT);     
    pinMode(PIN_TX, OUTPUT); 

    servo_horz.attach(SERVO_PIN_HORZ, SERVO_HORZ_MIN, SERVO_HORZ_MAX);

    servo_horz.writeMicroseconds(servo_horz_pos);
    
    // Join the i2c bus as master
    Wire.begin();
    
}


#define MOVE_INTERVAL_MILLIS 60

#define SERVO_INCREMENT 5 // How much to move each loop
#define SERVO_PIN_HORZ 9 // PB1
#define SERVO_HORZ_MAX 2800
#define SERVO_HORZ_MIN 700
#define SERVO_PIN_HORZ_POWER 8 // PB0


// When the last move was attempted.
unsigned long move_last = 0; 
