DESIGN AND DEVELOPMENT OF
FRAMELESS LASER HARP
Guided by–

Mr. S. Ravi Kumar
Submitted by Sunny Singh(15K81A04B7)
 Sumair Akram(15K81A0492)
 Kishan Kumar(15K81A0483)
 Samad Khan(14K81A0499)
INTRODUCTION
 Laser harp is a electronic musical
instrument.
 It consists of a number of laser
beams representing strings of a real
harp.
 To produce musical notes a laser
beam is blocked just like a string is
plucked on a harp.
 LASER HARP was first popularized by Jean Michel Jarre, a
French composer, performer and record producer.
 The laser harp was used at the annual Burning Man event
in Black Rock City, Nevada, in 2005 and 2012. It has also
been used at many art and cultural events around the
world.
 The first portable bi-color laser harp was invented by
Maurizio Carelli in 2008 and is still being produced.
COMPONENTS
1. ARDUINO UNO
2. STEPPER MOTOR(UNI-POLAR)
3. LASER
4. BREADBOARD
5. LDR
6. TRIMPOT(5K)
7. MICRO-CONTROLLER(A4899)
8. MIDI-JACK
9. 2N222-TRANSISTOR
10. 2 POWER SUPPLY(12V-DC & 3.7V-DC )
11. MIDI TO PC USB CABLE
12. USB HUB
13. CAPACITOR (47uF)
14. CONNECTING WIRES
15. MIRROR
16. ARDUINO PROGRAM CODE
BLOCK DIAGRAM
MIDI
LASER
POWER
SUPPLY
ARDUINO UNO
SENSOR
12V DC
POWER
SUPPLY
LASER
A4899
MICROC-ONTOLLR
BI-POLAR
STEPPER MOTOR
2N22
TRANSISTOR
LASER
Laser beam
MIRROR
STEPPER
MOTOR
1A 1B
2A
LDR
2B
3.7V
DC
LASER
POWER
SUPPLY
5K
TRIMPOT
GND
MICRO
VCC
VDD
CONTROLLE
VCC
R GND DIR STEP
47µ
f
P3
P4
MIDI IN TO PC
A0
P7
ARDUINO UNO
TX
P2l;huj21235434154p4215hdcy5
tg5dc
12V DC power
supply
(MOTOR)
5V
GND
220ῼ
ARDUINO TO PC
OVERVIEW
Basic outline of harp
 A laser beam is shone.
 A stepper motor with a mirror divides it into five beams.
 When one or more of the beams are cut, the light sensor detects it.
 According to the corresponding motor positions, Arduino sends signals to the PC or
MIDI output devices.
 which in turn produces the respective notes.
How the beam is created
 A mirror is attached to the motor.
 The laser beam is directed to the mirror.
 The motor rotates in steps, hence stepper motor. With every step the
motor takes, the position of the mirror changes.
 The steps take place fast enough for the beams to appear.
How the harp knows which beam has been cut:
 Every beam has a corresponding motor position.
 When a beam is cut, it reflects onto the sensor, which detects an
increase in light intensity.
 The arduino then looks for the position of the motor at the instant
the beam was cut, and thus identifies the beam in question.
World wide users of laser harp
PURPOSE
 Eye catching musical Experience.
 It can play tunes of different musical instruments.
 To provide entertainment through advance tech musical
atmosphere.
GOAL
 Build a profitable new musical instrument that is both visually and
aurally amusing.
 Play articulations with laser and sensors.
 Use laser as MIDI controller to manipulate timbre.
 Laser harps have gained notable popularity recently, with several
companies selling them for individual use – but at very high prices
(ranging from $60-$150 for even low-end models). Our objective is to
recreate a cheaper laser harp.
FUTURE SCOPE
 Technology is developing so fast that new sound synthesis methods and
functionality will replace old ones.
 The design of appropriate and optimal interfaces is therefore continuing to
evolve .
 It opens up a whole new era to the electronic musical industry.

CONCLUSION
In this project, the design and development of a new kind of electronic
musical device was explored. From the results, it is evident that this
kind of device is both practical and relatively inexpensive to construct
and operate. We successfully implemented the requirements we set out
to achieve. The result is a hybrid noncontact electronic musical
instrument. The fundamentals of this system are formed, but the
overall design, precision and effectiveness can be improved. With
further adaption's and improved methods, the possibilities of this
device are endless.
ARDUINO
 Micro controller
 Cross platform
 Open source and extensible software.
 Simple, clear programming environment.
 Open source and extensible hardware
LASER
 LASER
stands for Light amplification
stimulated emission of radiation.
 Light emitted from laser is monochromatic.
 Laser emit light that is highly directional.
 The light from the laser is said to be coherent.
by
LDR(LIGHT DEPENDENT RESISTOR)
▪ An LDR is an input sensor, which convert
light to resistance.
▪ LDR exhibits photoconductivity.
▪ When the light level is low, the resistor of
LDR is high.
▪ LDR play an important role in controlling
the electrical appliances based on the
intensity of light.
Microcontroller a4988
•
•
•
The a4988 is a very common and inexpensive stepper motor
controller.
It is used in 3D printers and CNC machines where several stepper
motors need to be managed.
Doing advanced things like Microstepping is easy, without using any
special library or tying up computing resources.
TRIMPOT:
 It is a potentiometer( variable resistor).
 By varying the resistor, It creates a variable
voltage source.
 Is used to calibrate binary voltmeter circuit.
Bi-polor stepper motor
• It is an Electromagnetic device.
• It converts electric pulses into small mechanical steps.
• A stepper motor has the following attributes:
•Number of steps per rotation
•Torque (the weight it can bear)
•Step angle accuracy
• By manipulating the control pulses, you can make the stepper motor
carry out different function such as taking half steps (e.g. 400/rotation
instead of 200).