In this instructable I made an Arduino project that allows me to control a laser with a smartphone or tablet.

Step 1: Things You Will Need

2 9 gram servo motors.

1 bread board.

1 laser.

1 Arduino Nano board.

Assortment of wires.

1 Bluetooth transceiver.

1 9v battery.

1 Smartphone or tablet.

1 box.

Double sided tape.

Soldering iron (Not required but usefull)

Step 2: Preparing the Laser

open up the laser and remove the batteries
attach a wire to the + inside the laser
attach a wire to the - on the side of the laser where it is screwed on, preferably with a soldering iron or with hot glue
wrap a wire around the laser in order to keep the button pressed down.

Step 3: Preparing the Servos

attach one servo on top of the other with glue or a by wrapping a wire or a string around the servo and the attachment on the other servo.

Step 4: Upload the Code to the Arduino Board

<p>#include <br>Servo XAxis;
Servo YAxis;</p><p>int XAxisAngle = 90;
int YAxisAngle = 90;</p><p>void setup() {
  Serial.begin(9600);
  XAxis.attach(7);
  YAxis.attach(8);</p><p>  XAxis.write(XAxisAngle);
  YAxis.write(YAxisAngle);
}</p><p>void loop() {
  int ChangeValue = 2;
  if (Serial.available() > 0) {
    char Character = Serial.read();</p><p>    if (Character == 'L') {
      XAxisAngle += ChangeValue;
      Serial.println("Left");
    } else {
      if (Character == 'R') {
        XAxisAngle -= ChangeValue;
        Serial.println("Right");
      } else {
        if (Character == 'U') {
          YAxisAngle += ChangeValue;
          Serial.println("Up");
        } else {
          if (Character == 'D') {
            YAxisAngle -= ChangeValue;
            Serial.println("Down");
          } else {
            Serial.print("Command not found:");
            Serial.println(Character);
          }
        }</p><p>      }
    }
  }
  if (YAxisAngle > 180) {
    YAxisAngle = 180;
  }
  if (YAxisAngle < 0) {
    YAxisAngle = 0;
  }
  if (XAxisAngle > 180) {
    XAxisAngle = 180;
  }
  if (XAxisAngle < 0) {
    XAxisAngle = 0;
  }
  YAxis.write(YAxisAngle);
  XAxis.write(XAxisAngle);
}</p>

Step 5: Putting Everything Together

put the Arduino in to the breadboard.
attach the Bluetooth transceiver to the Arduino board (tx to rx and rx to tx)
attach the servo motors to the Arduino on pins 7 and 8.
attach the laser to the servo motor with double sided tape
put the 5v and ground wires of the laser to the 5v and ground of the Arduino.
use the double sided tape to attach the servo motors to the bottom of the box and use a wire to secure it in place.
stick the breadboard on to the side of the box
attach the battery to the Vin and ground of the Arduino

Step 6: Bluetooth App

Download an Arduino Bluetooth controller app.
Set the Up arrow to send the letter U.
Set the Down arrow to send the letter D.
Set the Left arrow to send the letter L.
Set the Right arrow to send the letter R.

Step 7: Finished!

That it. You're done.

Introduction: Laser Controller