Laser Guitar

In this project, we replaced the strings of an old guitar with lasers and DIY beam splitters.

Nov 30, 2020

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art

music

Devices & Components

Arduino Uno Rev3

LDR, 5 Mohm

Resistor 10k ohm

Laser Diode, 655 nm

Hardware & Tools

Mircroscope slides

Software & Tools

GarageBand

Hairless MIDI

MIDI loop

Project description

Code

Programming and algorithm

arduino

1#include <MIDI.h> // this code uses MIDI arduino library (previous codes  used)
2// Created and binds the MIDI interface to the default hardware Serial  port
3MIDI_CREATE_DEFAULT_INSTANCE();
4// Piano Guitar sample 12/24/16
5//  User settable variables
6//*****************************************************************************************************
7int  strings=3;//number of strings
8int frets=2;//number of frets
9int TOTAL=strings*(frets+1);//  number of LDRs
10int PlayNote[9];
11int Onetime[ ]={0,0,0};// to make sure a note  doesn’t play twice.
12int string=0;
13int DELAY=200; // This puts time difference  until next MIDI is sent
14//******************************************************************************************************
15//Internal  Use Variables
16//******************************************************************************************************
17int  pin;
18int note0=10;
19int note1=10;
20int note2=10;
21int NOWnote=0;
22int  hit;
23//boolean error=false;
24//******************************************************************************************************
25//Setup
26//******************************************************************************************************
27void  setup()
28{
29Serial.begin(115200);
30}
31//******************************************************************************************************
32//Main  Program
33//******************************************************************************************************
34void  loop()
35{
36// takes sensors input
37 for (pin=0; pin < strings ; pin++) //  takes inputs from pin responsible for the plucking
38{ // lowest note assigned  to first pin
39 hit = digitalRead(pin); // read the input pin
40 PlayNote[pin]=hit;//  stores the results from the pins inputs
41}
42 for (pin=strings; pin < TOTAL ;  pin++) // takes inputs from pin responsible for the plucking
43{ // lowest note  assigned to first pin
44 hit = digitalRead(pin); // read the input pin
45 PlayNote[pin]=hit;
46}
47//******************************************************************************************************
48//Play  music
49//******************************************************************************************************
50
51  if(note0!=-2&&note1!=-2&&note2!=-2)// check if there is an error or not.
52 {
53  if (PlayNote[0]==1&&Onetime[0]!=1) // pluck string 0 // makes sure not to play two  notes
54 {
55 NOWnote=note0;
56 Onetime[0]=1; // played and waits untill ur the  finger is off
57 }
58 else if (PlayNote[1]==1&&Onetime[1]!=1) // pluck string  1
59 {
60 NOWnote=note1;
61 Onetime[1]=1; // played and waits untill ur the finger  is off
62 }
63 else if (PlayNote[2]==1&&Onetime[2]!=1) // pluck string 2
64 {
65  NOWnote=note2;
66 Onetime[2]=1; // played and waits untill ur the finger is off
67  }
68 MIDI.sendNoteOn(NOWnote,127,0);
69 delay(DELAY); //play note: meaning pluck
70  }
71 else // find the right note
72 {
73 note0=find_note(PlayNote,0);
74 note1=find_note(PlayNote,1);
75  note2=find_note(PlayNote,2);
76 }
77
78 for(int i=0;i<strings;i++)// resets the  logic test
79 {
80 if (PlayNote[i]==0)
81 {
82 Onetime[i]=0;
83 }
84 }
85}
86//******************************************************************************************************
87//Find  MIDI note
88//******************************************************************************************************
89int  find_note(int PlayNote[9] ,int string )
90{
91int AllNote[3][3] ={ {50,68,69}  , {62,63,64} , {66,67,68} }; // order is importent
92int note=-2;
93int j=0;
94int  notes[ ]={50,68,69};
95int Play[]={0,0};
96//loading the notes
97for (int i=0;i<4;i++)
98{
99notes[i]=AllNote[string][i];
100}
101//take  the frets input
102for (int i=2*string+3;i<2*string+5;i++) //loading the inputs
103{
104Play[j]=PlayNote[i];
105j++;
106}
107//logic
108  if (Play[1]==0 && Play[2]==0) // no fretting
109 {
110 note=notes[0]; //open string
111  }
112 else if (Play[0]==1 && Play[1]==1) // fret 1 which blocks two LDRs in a row
113  {
114 note=notes[1]; //first fret is pressed
115 }
116 else if (Play[0]==0 && Play[1]==1  ) // fret 2 which only blocks last LDR in a row
117 {
118 note=notes[2]; //second  fret is pressed
119 }
120 else
121 {
122 // error=true;
123 note=-2;
124 }
125 return  note;
126}
127[/code]

#include <MIDI.h> // this code uses MIDI arduino library (previous codes  used)
// Created and binds the MIDI interface to the default hardware Serial  port
MIDI_CREATE_DEFAULT_INSTANCE();
// Piano Guitar sample 12/24/16
//  User settable variables
//*****************************************************************************************************
int  strings=3;//number of strings
int frets=2;//number of frets
int TOTAL=strings*(frets+1);//  number of LDRs
int PlayNote[9];
int Onetime[ ]={0,0,0};// to make sure a note  doesn’t play twice.
int string=0;
int DELAY=200; // This puts time difference  until next MIDI is sent
//******************************************************************************************************
//Internal  Use Variables
//******************************************************************************************************
int  pin;
int note0=10;
int note1=10;
int note2=10;
int NOWnote=0;
int  hit;
//boolean error=false;
//******************************************************************************************************
//Setup
//******************************************************************************************************
void  setup()
{
Serial.begin(115200);
}
//******************************************************************************************************
//Main  Program
//******************************************************************************************************
void  loop()
{
// takes sensors input
 for (pin=0; pin < strings ; pin++) //  takes inputs from pin responsible for the plucking
{ // lowest note assigned  to first pin
 hit = digitalRead(pin); // read the input pin
 PlayNote[pin]=hit;//  stores the results from the pins inputs
}
 for (pin=strings; pin < TOTAL ;  pin++) // takes inputs from pin responsible for the plucking
{ // lowest note  assigned to first pin
 hit = digitalRead(pin); // read the input pin
 PlayNote[pin]=hit;
}
//******************************************************************************************************
//Play  music
//******************************************************************************************************

  if(note0!=-2&&note1!=-2&&note2!=-2)// check if there is an error or not.
 {
  if (PlayNote[0]==1&&Onetime[0]!=1) // pluck string 0 // makes sure not to play two  notes
 {
 NOWnote=note0;
 Onetime[0]=1; // played and waits untill ur the  finger is off
 }
 else if (PlayNote[1]==1&&Onetime[1]!=1) // pluck string  1
 {
 NOWnote=note1;
 Onetime[1]=1; // played and waits untill ur the finger  is off
 }
 else if (PlayNote[2]==1&&Onetime[2]!=1) // pluck string 2
 {
  NOWnote=note2;
 Onetime[2]=1; // played and waits untill ur the finger is off
  }
 MIDI.sendNoteOn(NOWnote,127,0);
 delay(DELAY); //play note: meaning pluck
  }
 else // find the right note
 {
 note0=find_note(PlayNote,0);
 note1=find_note(PlayNote,1);
  note2=find_note(PlayNote,2);
 }

 for(int i=0;i<strings;i++)// resets the  logic test
 {
 if (PlayNote[i]==0)
 {
 Onetime[i]=0;
 }
 }
}
//******************************************************************************************************
//Find  MIDI note
//******************************************************************************************************
int  find_note(int PlayNote[9] ,int string )
{
int AllNote[3][3] ={ {50,68,69}  , {62,63,64} , {66,67,68} }; // order is importent
int note=-2;
int j=0;
int  notes[ ]={50,68,69};
int Play[]={0,0};
//loading the notes
for (int i=0;i<4;i++)
{
notes[i]=AllNote[string][i];
}
//take  the frets input
for (int i=2*string+3;i<2*string+5;i++) //loading the inputs
{
Play[j]=PlayNote[i];
j++;
}
//logic
  if (Play[1]==0 && Play[2]==0) // no fretting
 {
 note=notes[0]; //open string
  }
 else if (Play[0]==1 && Play[1]==1) // fret 1 which blocks two LDRs in a row
  {
 note=notes[1]; //first fret is pressed
 }
 else if (Play[0]==0 && Play[1]==1  ) // fret 2 which only blocks last LDR in a row
 {
 note=notes[2]; //second  fret is pressed
 }
 else
 {
 // error=true;
 note=-2;
 }
 return  note;
}
[/code]

Programming and algorithm

arduino

1#include <MIDI.h> // this code uses MIDI arduino library (previous codes   used)
2// Created and binds the MIDI interface to the default hardware Serial   port
3MIDI_CREATE_DEFAULT_INSTANCE();
4// Piano Guitar sample 12/24/16
5//   User settable variables
6//*****************************************************************************************************
7int   strings=3;//number of strings
8int frets=2;//number of frets
9int TOTAL=strings*(frets+1);//   number of LDRs
10int PlayNote[9];
11int Onetime[ ]={0,0,0};// to make sure a note   doesn’t play twice.
12int string=0;
13int DELAY=200; // This puts time difference   until next MIDI is sent
14//******************************************************************************************************
15//Internal   Use Variables
16//******************************************************************************************************
17int   pin;
18int note0=10;
19int note1=10;
20int note2=10;
21int NOWnote=0;
22int   hit;
23//boolean error=false;
24//******************************************************************************************************
25//Setup
26//******************************************************************************************************
27void   setup()
28{
29Serial.begin(115200);
30}
31//******************************************************************************************************
32//Main   Program
33//******************************************************************************************************
34void   loop()
35{
36// takes sensors input
37 for (pin=0; pin < strings ; pin++) //   takes inputs from pin responsible for the plucking
38{ // lowest note assigned   to first pin
39 hit = digitalRead(pin); // read the input pin
40 PlayNote[pin]=hit;//   stores the results from the pins inputs
41}
42 for (pin=strings; pin < TOTAL ;   pin++) // takes inputs from pin responsible for the plucking
43{ // lowest note   assigned to first pin
44 hit = digitalRead(pin); // read the input pin
45 PlayNote[pin]=hit;
46}
47//******************************************************************************************************
48//Play   music
49//******************************************************************************************************
50
51   if(note0!=-2&&note1!=-2&&note2!=-2)// check if there is an error or not.
52 {
53   if (PlayNote[0]==1&&Onetime[0]!=1) // pluck string 0 // makes sure not to play two   notes
54 {
55 NOWnote=note0;
56 Onetime[0]=1; // played and waits untill ur the   finger is off
57 }
58 else if (PlayNote[1]==1&&Onetime[1]!=1) // pluck string   1
59 {
60 NOWnote=note1;
61 Onetime[1]=1; // played and waits untill ur the finger   is off
62 }
63 else if (PlayNote[2]==1&&Onetime[2]!=1) // pluck string 2
64 {
65   NOWnote=note2;
66 Onetime[2]=1; // played and waits untill ur the finger is off
67   }
68 MIDI.sendNoteOn(NOWnote,127,0);
69 delay(DELAY); //play note: meaning pluck
70   }
71 else // find the right note
72 {
73 note0=find_note(PlayNote,0);
74 note1=find_note(PlayNote,1);
75   note2=find_note(PlayNote,2);
76 }
77
78 for(int i=0;i<strings;i++)// resets the   logic test
79 {
80 if (PlayNote[i]==0)
81 {
82 Onetime[i]=0;
83 }
84 }
85}
86//******************************************************************************************************
87//Find   MIDI note
88//******************************************************************************************************
89int   find_note(int PlayNote[9] ,int string )
90{
91int AllNote[3][3] ={ {50,68,69}   , {62,63,64} , {66,67,68} }; // order is importent
92int note=-2;
93int j=0;
94int   notes[ ]={50,68,69};
95int Play[]={0,0};
96//loading the notes
97for (int i=0;i<4;i++)
98{
99notes[i]=AllNote[string][i];
100}
101//take   the frets input
102for (int i=2*string+3;i<2*string+5;i++) //loading the inputs
103{
104Play[j]=PlayNote[i];
105j++;
106}
107//logic
108   if (Play[1]==0 && Play[2]==0) // no fretting
109 {
110 note=notes[0]; //open string
111   }
112 else if (Play[0]==1 && Play[1]==1) // fret 1 which blocks two LDRs in a row
113   {
114 note=notes[1]; //first fret is pressed
115 }
116 else if (Play[0]==0 && Play[1]==1   ) // fret 2 which only blocks last LDR in a row
117 {
118 note=notes[2]; //second   fret is pressed
119 }
120 else
121 {
122 // error=true;
123 note=-2;
124 }
125 return   note;
126}
127[/code]

#include <MIDI.h> // this code uses MIDI arduino library (previous codes   used)
// Created and binds the MIDI interface to the default hardware Serial   port
MIDI_CREATE_DEFAULT_INSTANCE();
// Piano Guitar sample 12/24/16
//   User settable variables
//*****************************************************************************************************
int   strings=3;//number of strings
int frets=2;//number of frets
int TOTAL=strings*(frets+1);//   number of LDRs
int PlayNote[9];
int Onetime[ ]={0,0,0};// to make sure a note   doesn’t play twice.
int string=0;
int DELAY=200; // This puts time difference   until next MIDI is sent
//******************************************************************************************************
//Internal   Use Variables
//******************************************************************************************************
int   pin;
int note0=10;
int note1=10;
int note2=10;
int NOWnote=0;
int   hit;
//boolean error=false;
//******************************************************************************************************
//Setup
//******************************************************************************************************
void   setup()
{
Serial.begin(115200);
}
//******************************************************************************************************
//Main   Program
//******************************************************************************************************
void   loop()
{
// takes sensors input
 for (pin=0; pin < strings ; pin++) //   takes inputs from pin responsible for the plucking
{ // lowest note assigned   to first pin
 hit = digitalRead(pin); // read the input pin
 PlayNote[pin]=hit;//   stores the results from the pins inputs
}
 for (pin=strings; pin < TOTAL ;   pin++) // takes inputs from pin responsible for the plucking
{ // lowest note   assigned to first pin
 hit = digitalRead(pin); // read the input pin
 PlayNote[pin]=hit;
}
//******************************************************************************************************
//Play   music
//******************************************************************************************************

   if(note0!=-2&&note1!=-2&&note2!=-2)// check if there is an error or not.
 {
   if (PlayNote[0]==1&&Onetime[0]!=1) // pluck string 0 // makes sure not to play two   notes
 {
 NOWnote=note0;
 Onetime[0]=1; // played and waits untill ur the   finger is off
 }
 else if (PlayNote[1]==1&&Onetime[1]!=1) // pluck string   1
 {
 NOWnote=note1;
 Onetime[1]=1; // played and waits untill ur the finger   is off
 }
 else if (PlayNote[2]==1&&Onetime[2]!=1) // pluck string 2
 {
   NOWnote=note2;
 Onetime[2]=1; // played and waits untill ur the finger is off
   }
 MIDI.sendNoteOn(NOWnote,127,0);
 delay(DELAY); //play note: meaning pluck
   }
 else // find the right note
 {
 note0=find_note(PlayNote,0);
 note1=find_note(PlayNote,1);
   note2=find_note(PlayNote,2);
 }

 for(int i=0;i<strings;i++)// resets the   logic test
 {
 if (PlayNote[i]==0)
 {
 Onetime[i]=0;
 }
 }
}
//******************************************************************************************************
//Find   MIDI note
//******************************************************************************************************
int   find_note(int PlayNote[9] ,int string )
{
int AllNote[3][3] ={ {50,68,69}   , {62,63,64} , {66,67,68} }; // order is importent
int note=-2;
int j=0;
int   notes[ ]={50,68,69};
int Play[]={0,0};
//loading the notes
for (int i=0;i<4;i++)
{
notes[i]=AllNote[string][i];
}
//take   the frets input
for (int i=2*string+3;i<2*string+5;i++) //loading the inputs
{
Play[j]=PlayNote[i];
j++;
}
//logic
   if (Play[1]==0 && Play[2]==0) // no fretting
 {
 note=notes[0]; //open string
   }
 else if (Play[0]==1 && Play[1]==1) // fret 1 which blocks two LDRs in a row
   {
 note=notes[1]; //first fret is pressed
 }
 else if (Play[0]==0 && Play[1]==1   ) // fret 2 which only blocks last LDR in a row
 {
 note=notes[2]; //second   fret is pressed
 }
 else
 {
 // error=true;
 note=-2;
 }
 return   note;
}
[/code]

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