Laser Harp


 This project was created for leisure purposes. It is also quickly    recreatable, as the materials are easily available and the costs are low.

The structure is not complicated, in fact it is composed of a rectangular wooden structure. On the two major sides, 6 equidistant holes were created that corresponded respectively with those created on the opposite side.

For the laser part, however, an arduino board with lights and light sensors was used. Finally, this part is covered by a wooden door held together with the structure thanks to the hinges.


  1. 1 arduino board  (10,75 $)
  2. wood structure 
  3. 1 9v battery  (1.06 $)
  4. 6 arduino lasers  (3,09 $)
  5. 6 arduino photoreceptors (18,72 $)
  6. hot glue (10.67 $)
  7. copper tape (5,39 $)


Among the tools used followed:

  • a drill with a wood drill of size 8;
  • an electric saw and sander to derive the components of the structure;
  • a screwdriver for mounting the various pieces;
  • a glue gun needed to set component requirements such as the battery;
  • stagnator to compose electrical wires of the necessary length;


  • we created a rectangular structure by assembling the various wooden components, once cut and smoothed.
  • the holes for the photoreceptors were made before assembly, they were made equidistant from each other;
  • the lasers were positioned on the opposite side in the same positions so that they coincided.
  • under the base copper bands were glued to which the battery was connected; there is also connected the switch for the ignition mechanism also located at the base.
  • the electronic part has been positioned in the upper part of the structure, consisting of a breadboard which is connected to the photoreceptors inserted in the upper axis of the structure by means of the conducting wires.
  • the breadboard has been positioned externally in order to be connected to an external powerbank and to the amplifier.
  • the upper part was closed by a wooden door built with the help of hinges.


  • possibility of insufficient power by lasers.
  • alignment and equidistance of the holes too approximate and not sufficiently precise.
  • possible errors in the implementation of the arduino program.


It is necessary to wear the right protections when cutting, sanding and assembling the wooden structure and during tinning to weld the Arduino wires.