Laser-Harp

Laser Harp repo

What is a laser harp?

A laser harp is an electronic musical instrument that lets a performer “play” music by interrupting a set of light beams—most commonly laser beams (or sometimes high-power LEDs) arranged like the strings of a harp.

• Each beam acts like a virtual string.
• When your hand breaks a beam, the instrument detects that interruption using light sensors (typically photodiodes, photoresistors/LDRs, or phototransistors).
• A controller (often a microcontroller such as an Arduino, daisy, ESP32, etc.) translates that event into a musical message, for example:
  • triggering a note (MIDI Note On/Off),
  • triggering a sample,
  • changing an effect parameter (filters, reverb, delay),
  • or controlling volume/expression.

Laser harps are popular in live performances because they are both musically expressive and visually striking, giving the audience a clear “see the music” experience.

Our AIM

Developing a laser harp usually focusing on a combination of musical, technical, and creative goals:

1. Create a new performance interface

The main aim is to build an instrument that feels different from a keyboard or guitar—one that turns gestures in space into music.

2. Combine sound with a strong visual show

Laser harps are designed to be stage-friendly. The beams provide immediate visual feedback and can be synchronized with lighting and effects to enhance a performance.

3. Explore expressive control

Beyond simple “note on/note off,” many laser harp projects aim to capture more nuance, such as:

• velocity (how fast a beam is broken),
• aftertouch-like behavior (keeping a hand in a beam),
• pitch bend or modulation using distance/position sensing,
• dynamic mapping of beams to scales/chords.

4. Build an accessible, customizable instrument

A DIY laser harp can be tailored to a specific musician’s needs:

• number of beams (“strings”),
• scale and tuning modes,
• instrument voices and sound design,
• portability and power options,
• safety and beam brightness choices.

5. Learn and demonstrate engineering concepts

Laser harp development is often an educational goal as well, combining:

• optics and alignment,
• electronics and sensor design,
• embedded programming,
• MIDI/audio systems,
• real-time responsiveness and latency reduction.

Notes on safety

If using actual lasers, development should prioritize eye safety:

• avoid eye-level beams,
• use appropriate laser classes and protective design choices,
• prefer diffused/expanded beams and controlled environments,
• consider alternatives (LED + optics) when appropriate.