diff --git a/Software/Arduino/libraries/readme.txt b/Software/Arduino/libraries/readme.txt
new file mode 100644
index 0000000..a8f1390
--- /dev/null
+++ b/Software/Arduino/libraries/readme.txt
@@ -0,0 +1 @@
+For information on installing libraries, see: http://arduino.cc/en/Guide/Libraries
diff --git a/Software/Arduino/sketch_jun04a/sketch_jun04a.ino b/Software/Arduino/sketch_jun04a/sketch_jun04a.ino
new file mode 100644
index 0000000..cb4fa60
--- /dev/null
+++ b/Software/Arduino/sketch_jun04a/sketch_jun04a.ino
@@ -0,0 +1,77 @@
+/* 
+Author: F. Lionetto
+Created on: June 4th, 2014
+
+The sketch inizializes the position of the two stepper motors.
+
+Coordinate system:
+- x axis across the strips, forward direction is toward the window, backward direction is toward the door (stepper motor 1);
+- y axis along the strips;
+- z axis toward the strips, forward direction is down, backward direction is up (stepper motor 2).
+
+The x micro switch is connected to pin 22.
+The z micro switch is connected to pin 23.
+
+Distances in microns.
+*/
+
+#include <Wire.h>
+#include <Adafruit_MotorShield.h>
+#include "utility/Adafruit_PWMServoDriver.h"
+
+// Stepper motor properties.
+const int stepsPerRevolution = 200;
+const int singleStep = 5;
+
+// Create the motor shield object with the default I2C address.
+Adafruit_MotorShield AFMS = Adafruit_MotorShield(); 
+
+// Connect a stepper motor with 200 steps per revolution (1.8 degree) to motor port #1 (M1 and M2).
+Adafruit_StepperMotor *myMotorX = AFMS.getStepper(stepsPerRevolution, 1);
+Adafruit_StepperMotor *myMotorZ = AFMS.getStepper(stepsPerRevolution, 2);
+
+// Micro switch properties.
+const int switchXPin = 22;
+const int switchZPin = 23;
+int switchXState = 0;
+int switchZState = 0;
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("This is a test!");
+
+  AFMS.begin();  
+  
+  myMotorX->setSpeed(50);  
+  myMotorZ->setSpeed(50);
+  
+  pinMode(switchXPin,INPUT);
+  pinMode(switchZPin,INPUT);
+  
+  Serial.println("Inizializing position along x...");
+
+  while (switchXState == LOW) {
+    switchXState = digitalRead(switchXPin);
+    if (switchXState == LOW) {
+    // The stepper motor is not at the origin of the coordinate system.
+    myMotorX->step(1,FORWARD,DOUBLE);
+    }
+  }
+  
+  Serial.println("Position along x successfully initialized.");
+  
+  Serial.println("Inizializing position along z...");
+
+  while (switchZState == LOW) {
+    switchZState = digitalRead(switchZPin);
+    if (switchZState == LOW) {
+    // The stepper motor is not at the origin of the coordinate system.
+    myMotorZ->step(1,BACKWARD,DOUBLE);
+    }
+  }
+  
+  Serial.println("Position along z successfully initialized.");
+}
+  
+void loop() {
+}
diff --git a/Software/Arduino/sketch_jun17a/sketch_jun17a.ino b/Software/Arduino/sketch_jun17a/sketch_jun17a.ino
new file mode 100644
index 0000000..e991af8
--- /dev/null
+++ b/Software/Arduino/sketch_jun17a/sketch_jun17a.ino
@@ -0,0 +1,132 @@
+/* 
+Author: F. Lionetto
+Created on: June 4th, 2014
+
+The sketch inizializes the position of the two stepper motors, move the laser 5 cm (10000 steps) away from the x micro switch, move the laser 2.5 cm (5000) away from the z micro switch, and then perform a scan for finding the focal length.
+
+Scan for finding the focal length:
+- at a given z position, move one step backward along x, wait, move one step backward along x, wait, and so on (enough times to go across two strips);
+- go back to the initial position along x; 
+- move one step forward along z;
+- repeat from the beginning (enough times to be sure to find the focal length, but not that many to touch the silicon sensor);
+- again and again.
+In the current configuration, scan of 1 mm along x and 1 mm along z.
+
+Coordinate system:
+- x axis across the strips, forward direction is toward the window, backward direction is toward the door (stepper motor 1);
+- y axis along the strips;
+- z axis toward the strips, forward direction is down, backward direction is up (stepper motor 2).
+
+The x micro switch is connected to pin 22.
+The z micro switch is connected to pin 23.
+
+Distances in microns.
+*/
+
+#include <Wire.h>
+#include <Adafruit_MotorShield.h>
+#include "utility/Adafruit_PWMServoDriver.h"
+
+// Stepper motor properties.
+const int stepsPerRevolution = 200;
+const int singleStep = 5;
+
+// Create the motor shield object with the default I2C address.
+Adafruit_MotorShield AFMS = Adafruit_MotorShield(); 
+
+// Connect a stepper motor with 200 steps per revolution (1.8 degree) to motor port #1 (M1 and M2).
+Adafruit_StepperMotor *myMotorX = AFMS.getStepper(stepsPerRevolution, 1);
+Adafruit_StepperMotor *myMotorZ = AFMS.getStepper(stepsPerRevolution, 2);
+
+// Micro switch properties.
+const int switchXPin = 22;
+const int switchZPin = 23;
+int switchXState = 0;
+int switchZState = 0;
+
+// Scan properties.
+// Total number of steps we need along x.
+const int totStepsX = 200;
+// Total number of steps we need along y.
+const int totStepsZ = 200;
+int stepsX = 0;
+int stepsZ = 0;
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("This is a test!");
+
+  AFMS.begin();  
+  
+  myMotorX->setSpeed(50);  
+  myMotorZ->setSpeed(50);
+  
+  pinMode(switchXPin,INPUT);
+  pinMode(switchZPin,INPUT);
+  
+  Serial.println("Inizializing position along x...");
+
+  while (switchXState == LOW) {
+    switchXState = digitalRead(switchXPin);
+    if (switchXState == LOW) {
+    // The stepper motor is not at the origin of the coordinate system.
+    myMotorX->step(1,FORWARD,DOUBLE);
+    }
+  }
+  
+  Serial.println("Position along x successfully initialized.");
+  
+  Serial.println("Inizializing position along z...");
+
+  while (switchZState == LOW) {
+    switchZState = digitalRead(switchZPin);
+    if (switchZState == LOW) {
+    // The stepper motor is not at the origin of the coordinate system.
+    myMotorZ->step(1,BACKWARD,DOUBLE);
+    }
+  }
+  
+  Serial.println("Position along z successfully initialized.");
+    
+  Serial.println("Moving the laser 5 cm (10000 steps) away from the x micro switch...");
+  
+  myMotorX->step(10000,BACKWARD,DOUBLE);
+  
+  Serial.println("Laser moved 5 cm (10000 steps) away from the x micro switch.");
+
+  Serial.println("Moving the laser 2.5 cm (5000 steps) away from the z micro switch...");
+  
+  myMotorZ->step(5000,FORWARD,DOUBLE);
+  
+  Serial.println("Laser moved 2.5 cm (5000 steps) away from the z micro switch.");
+
+  myMotorX->setSpeed(5);
+  myMotorZ->setSpeed(5);
+  
+  myMotorX->release();
+  myMotorZ->release();
+}
+  
+void loop() {
+// Scan for finding the focal length.
+  if(stepsZ < totStepsZ) {
+    Serial.print("Data acquisition at z = ");
+    Serial.println(stepsZ);
+    if (stepsX < totStepsX) {
+      myMotorX->step(1,BACKWARD,DOUBLE);
+      myMotorX->release();
+      stepsX = stepsX + 1;
+    }
+    else if (stepsX == totStepsX) {
+      myMotorX->step(totStepsX,FORWARD,DOUBLE);
+      myMotorX->release();
+      stepsX = 0;
+      myMotorZ->step(1,FORWARD,DOUBLE);
+      myMotorZ->release();
+      stepsZ = stepsZ + 1;
+    }
+  }
+  else {
+    Serial.println("Scan for finding the focal length completed.");
+  }
+}
diff --git a/Software/Arduino/sketch_jun23a/sketch_jun23a.ino b/Software/Arduino/sketch_jun23a/sketch_jun23a.ino
new file mode 100644
index 0000000..c3db030
--- /dev/null
+++ b/Software/Arduino/sketch_jun23a/sketch_jun23a.ino
@@ -0,0 +1,187 @@
+/* 
+Author: F. Lionetto
+Created on: June 23rd, 2014
+
+The sketch inizializes the position of the two stepper motors, move the laser 4.25 cm (8500 steps) away from the x micro switch, move the laser 2.5 cm (5000 steps) away from the z micro switch, and then waits for commands sent through the USB port.
+
+Coordinate system:
+- x axis across the strips, forward direction is toward the window, backward direction is toward the door (stepper motor 1);
+- y axis along the strips;
+- z axis toward the strips, forward direction is down, backward direction is up (stepper motor 2).
+
+The x micro switch is connected to pin 22.
+The z micro switch is connected to pin 23.
+
+The stepper motors have two different speeds, one for non-precise and one for precise positioning, respectively.
+
+ASCII printable characters:
++ ---> 43;
+0 ---> 48;
+1 ---> 49;
+2 ---> 50.
+
+The only allowed commands (checked before and after being sent through the USB port) are:
++10 ---> move one step forward along x;
++20 ---> move one step backward along x
++01 ---> move one step forward along z;
++02 ---> move one step backward along z.
+
+Distances in microns.
+*/
+
+#include <Wire.h>
+#include <Adafruit_MotorShield.h>
+#include "utility/Adafruit_PWMServoDriver.h"
+
+// Stepper motor properties.
+const int stepsPerRevolution = 200;
+const int singleStep = 5;
+const int speedFast = 50;
+const int speedSlow = 5;
+
+// Create the motor shield object with the default I2C address.
+Adafruit_MotorShield AFMS = Adafruit_MotorShield(); 
+
+// Connect a stepper motor with 200 steps per revolution (1.8 degree) to motor port #1 (M1 and M2).
+Adafruit_StepperMotor *myMotorX = AFMS.getStepper(stepsPerRevolution, 1);
+Adafruit_StepperMotor *myMotorZ = AFMS.getStepper(stepsPerRevolution, 2);
+
+// Micro switch properties.
+const int switchXPin = 22;
+const int switchZPin = 23;
+int switchXState = 0;
+int switchZState = 0;
+
+// Scan properties.
+// Maximum distance from the x micro switch (!!!)
+// const int maxStepsX = 16000;
+// Maximum distance from the z micro switch (!!!)
+// const int maxStepsZ = 5400;
+// Move the laser 4.25 cm (8500 steps) away from the x micro switch
+const int stepsFromXSwitch = 8500;
+// Move the laser 2.5 cm (5000) away from the z micro switch
+const int stepsFromZSwitch = 5000;
+// Total number of steps we need along x.
+// const int totStepsX = 200;
+// Total number of steps we need along y.
+// const int totStepsZ = 200;
+// int stepsX = 0;
+// int stepsZ = 0;
+// Byte read from the USB port.
+byte byteUSB;
+// 1 if the byte read from the USB port is +.
+boolean commandReceived = false;
+// 1 if the byte read from the USB port is the first after +.
+boolean xCommandReceived = false;
+// 1 if the byte read from the USB port is the second after +.
+boolean zCommandReceived = false;
+int moveX = 0;
+int moveZ = 0;
+
+void stepAction(int moveX, int moveZ) {
+  if (moveX == 1) {
+    myMotorX->step(1,FORWARD,DOUBLE);
+    Serial.println("Moving forward along x...");
+  }
+  else if (moveX == 2) {
+    myMotorX->step(1,BACKWARD,DOUBLE);
+    Serial.println("Moving backward along x...");
+  }
+  if (moveZ == 1) {
+    myMotorZ->step(1,FORWARD,DOUBLE);
+    Serial.println("Moving forward along z...");
+  }
+  else if (moveZ == 2) {
+    myMotorZ->step(1,BACKWARD,DOUBLE);
+    Serial.println("Moving backward along z...");
+  }
+}
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("This is a test!");
+
+  AFMS.begin();  
+  
+  myMotorX->setSpeed(speedFast);  
+  myMotorZ->setSpeed(speedFast);
+  
+  pinMode(switchXPin,INPUT);
+  pinMode(switchZPin,INPUT);
+  
+  Serial.println("Inizializing position along x...");
+
+  while (switchXState == LOW) {
+    switchXState = digitalRead(switchXPin);
+    if (switchXState == LOW) {
+    // The stepper motor is not at the origin of the coordinate system.
+    myMotorX->step(1,FORWARD,DOUBLE);
+    }
+  }
+  
+  Serial.println("Position along x successfully initialized.");
+  
+  Serial.println("Inizializing position along z...");
+
+  while (switchZState == LOW) {
+    switchZState = digitalRead(switchZPin);
+    if (switchZState == LOW) {
+    // The stepper motor is not at the origin of the coordinate system.
+    myMotorZ->step(1,BACKWARD,DOUBLE);
+    }
+  }
+  
+  Serial.println("Position along z successfully initialized.");
+    
+  Serial.println("Moving the laser 4.25 cm (8500 steps) away from the x micro switch...");
+  
+  myMotorX->step(stepsFromXSwitch,BACKWARD,DOUBLE);
+  
+  Serial.println("Laser moved 4.25 cm (8500 steps) away from the x micro switch.");
+
+  Serial.println("Moving the laser 2.5 cm (5000 steps) away from the z micro switch...");
+  
+  myMotorZ->step(stepsFromZSwitch,FORWARD,DOUBLE);
+  
+  Serial.println("Laser moved 2.5 cm (5000 steps) away from the z micro switch.");
+
+  myMotorX->setSpeed(speedSlow);
+  myMotorZ->setSpeed(speedSlow);
+  
+  // myMotorX->release();
+  // myMotorZ->release();
+}
+  
+void loop() {
+  if (Serial.available()) {
+   byteUSB = Serial.read();
+   Serial.println(byteUSB);
+   if ((byteUSB != 43) && (byteUSB !=48) && (byteUSB != 49) && (byteUSB != 50)) {
+     Serial.println("Invalid command received.");
+   }
+   else if ((commandReceived == false) && (byteUSB == 43)) {
+     commandReceived = true;
+     Serial.println("Valid command received.");
+     xCommandReceived = false;
+     zCommandReceived = false;
+     moveX = 0;
+     moveZ = 0;
+   }
+   else if ((commandReceived == true) && (xCommandReceived == false)) {
+     moveX = byteUSB - 48;
+     Serial.println(moveX);
+     xCommandReceived = true;
+     Serial.println("Command for x direction received.");
+   }
+   else if ((commandReceived == true) && (zCommandReceived == false)) {
+     moveZ = byteUSB - 48;
+     Serial.println(moveZ);
+     zCommandReceived = true;
+     Serial.println("Command for z direction received.");
+   }
+  }
+  else if ((commandReceived == true) && (xCommandReceived == true) && (zCommandReceived == true)) {
+   stepAction(moveX,moveZ);
+   commandReceived = false;
+  } 
+}