Arduino MIDI Virtual DJ Controller

1#define DEBUG false     
2//You can use Arduino Serial Plotter for debug   by changing DEBUG to true,but it will make your MIDI board unable to send MIDI Message.
3
4#define   VALUE_MIN_RANGE 1
5#define DEBOUNCE_MS 100
6
7#define MIDI_MSG_NOTE_OFF 128   //or 0x80
8#define MIDI_MSG_NOTE_ON 144 //or 0x90
9#define MIDI_MSG_CTRL_CHANGE   176 //or 0xB0
10
11byte previous_values[2][8];
12byte previous_M_slide_value;
13unsigned   long btn_timer[2][8];
14//unsigned long timer = 0;
15
16void setup() {
17  
18   Serial.begin(115200);
19  previous_M_slide_value=-1;
20  for (int i = 0; i <   8; i++) {
21    previous_values[0][i] = -1;
22    previous_values[1][i] = -1;
23     btn_timer[0][i]=0;
24    btn_timer[1][i]=0;
25  }
26
27  pinMode(7, OUTPUT);
28   pinMode(6, OUTPUT);
29  pinMode(5, OUTPUT);
30
31}
32
33void loop() {
34
35   for (int i = 0; i < 8; i++) {
36    select(i);
37    int curr_value[2];
38     curr_value[0] = analogRead(A0);
39    curr_value[1] = analogRead(A1);
40    for   (byte side = 0; side < 2; side++) {
41      if (i != 3 && previous_values[side][i]   != (ATD(curr_value[side]) == 1 ? 0 : 127) && millis()>=btn_timer[side][i]) {
42//         When button is pressed.
43        byte val = ATD(curr_value[side]) == 1   ? 0 : 127;
44        previous_values[side][i] = val;
45        if (val == 127)   {
46          if (!DEBUG)sendNoteOn(0x39+side+i*2, val, 1);
47        } else if   (val == 0) {
48          if (!DEBUG)sendNoteOff(0x39+side+i*2, val, 1);
49          btn_timer[side][i]=millis()+DEBOUNCE_MS;
50         }
51      } else if (i == 3) {
52        int analog_val = map(curr_value[side],   0, 1023, 0, 127);
53        if (range(previous_values[side][i], analog_val, VALUE_MIN_RANGE)   != previous_values[side][i]) {
54//        When slider value is changed.
55          previous_values[side][i]   = analog_val;
56          if (!DEBUG)sendCtrlChange(0x39+side+i*2, previous_values[side][i],   1);
57        }
58      }
59    }
60    if(DEBUG)for(byte si=0;si<2;si++){
61       Serial.print(String(previous_values[si][i] + i * 150+si*150*8));
62      Serial.print(",");
63     }
64  }
65  if(DEBUG)Serial.println();
66  
67  int analog_val = map(analogRead(A2),   0, 1023, 0, 127);
68  if (range(previous_M_slide_value, analog_val, VALUE_MIN_RANGE)   != previous_M_slide_value) {
69    previous_M_slide_value = analog_val;
70    if   (!DEBUG)sendCtrlChange(0x57, previous_M_slide_value, 1);
71  }
72  
73  
74}
75
76
77void   printChart(int val) {
78  Serial.print(val);
79  Serial.print(",");
80}
81int   range(int previous, int current, int d) {
82//  This method compare previous value   and current value.
83//  If current value only increase or decrease "d",this   method will return previous value.
84//  If current value increase or decrease   "d" + >0 value ,this method will return current value.
85
86//example:
87//   previous=5;current=4;d=1
88//  return 5
89
90//  previous=5;current=3;d=1
91//   return 3
92
93  if (current == 127)return 127;
94  else if (current == 0)return   0;
95  if (current > previous && current - d == previous)return previous;
96  else   if (current < previous && previous - d == current)return previous;
97  else if   (current == previous)return previous;
98  return current;
99}
100
101bool ATD(int   analog_val) {
102//  Analog to digital
103//  analog_val:0~1023
104//  return 0   or 1.
105  if (((float)analog_val * 0.0048828125) > 2.94) {
106    return 1;
107   } else if (((float)analog_val * 0.0048828125) <= 1.47) {
108    return 0;
109   }
110}
111
112void select(int select) {
113//  CD4051 select
114//  C (MSB) :   S2  13  D7
115//  B       : S1  12  D6
116//  A (LSB) : S0  11  D5
117
118  for   (int inputPin = 0; inputPin < 3; inputPin++)
119  {
120    int pinState = bitRead(select,   inputPin);
121    digitalWrite(inputPin + 5, pinState);
122  }
123}
124
125//MIDI------------------------------------------
126void   sendNoteOn(byte note,byte velocity,byte channel){
127  sendChannelVoiceMsg(MIDI_MSG_NOTE_ON|(channel-1),note,velocity);
128   
129  }
130
131void sendNoteOff(byte note,byte velocity,byte channel){
132  sendChannelVoiceMsg(MIDI_MSG_NOTE_OFF|(channel-1),note,velocity);
133   }
134  
135void sendCtrlChange(byte cc,byte value,int channel) {
136  sendChannelVoiceMsg(MIDI_MSG_CTRL_CHANGE|(channel-1),cc,value);
137}
138
139void   sendChannelVoiceMsg(byte command, byte note, byte velocity) {
140  //send MIDI Channel   Voice Message
141  Serial.write(command);
142  Serial.write(note);
143  Serial.write(velocity);
144}

1<device name="arduino VDJ Controller" author="VincentYeh" description="arduino  VDJ Controller" version="800" decks="1" type="MIDI" identifier="#tevmidi0#"  motor="no">
2
3<button note="0x39" name="BUTTON-L0" channel="0" />
4<button  note="0x3A" name="BUTTON-R0" channel="0" />
5
6<button note="0x3B" name="BUTTON-L1"  channel="0" />
7<button note="0x3C" name="BUTTON-R1" channel="0" />
8
9<button  note="0x3D" name="BUTTON-L2" channel="0" />
10<button note="0x3E" name="BUTTON-R2"  channel="0" />
11
12<slider cc="0x3F" name="SLIDER-L0" channel="0"/>
13<slider  cc="0x40" name="SLIDER-R0" channel="0"/>
14
15<button note="0x41" name="BUTTON-L3"  channel="0" />
16<button note="0x42" name="BUTTON-R3" channel="0" />
17
18<button  note="0x43" name="BUTTON-L4" channel="0" />
19<button note="0x44" name="BUTTON-R4"  channel="0" />
20
21<button note="0x45" name="BUTTON-L5" channel="0" />
22<button  note="0x46" name="BUTTON-R5" channel="0" />
23
24<button note="0x47" name="BUTTON-L6"  channel="0" />
25<button note="0x48" name="BUTTON-R6" channel="0" />
26
27
28<slider  cc="0x57" name="SLIDER-M0" channel="0"/>
29
30</device>

1<?xml version="1.0" encoding="UTF-8"?>
2<mapper device="arduino
3  VDJ Controller" version="802" date="2019-04-06">
4	<map value="BUTTON-L0"
5  action="deck left play_button" />
6	<map value="BUTTON-L1" action="deck
7  left stop_button" />
8	<map value="BUTTON-L2" action="deck left sync" />
9	<map
10  value="BUTTON-L3" action="deck left pitch_reset" />
11	<map value="BUTTON-L4"
12  action="deck left loop_half" />
13	<map value="BUTTON-L5" action="deck left
14  loop" />
15	<map value="BUTTON-L6" action="deck left loop_double" />
16	<map
17  value="BUTTON-R0" action="deck right play_button" />
18	<map value="BUTTON-R1"
19  action="deck right stop_button" />
20	<map value="BUTTON-R2" action="deck
21  right sync" />
22	<map value="BUTTON-R3" action="deck right pitch_reset"
23  />
24	<map value="BUTTON-R4" action="deck right loop_half" />
25	<map value="BUTTON-R5"
26  action="deck right loop" />
27	<map value="BUTTON-R6" action="deck right
28  loop_double" />
29	<map value="SLIDER-M0" action="crossfader" />
30	<map
31  value="SLIDER-L0" action="deck left filter" />
32	<map value="SLIDER-R0"
33  action="deck right filter" />
34	
35	
36	<map value="PAD-L0" action="deck
37  left hot_cue 1" />
38	<map value="PAD-L1" action="deck left hot_cue 2" />
39	<map
40  value="PAD-L2" action="deck left hot_cue 3" />
41	<map value="PAD-R0" action="deck
42  right hot_cue 1" />
43	<map value="PAD-R1" action="deck right hot_cue 2"
44  />
45	<map value="PAD-R2" action="deck right hot_cue 3" />
46</mapper>
47

1#define DEBUG false     
2//You can use Arduino Serial Plotter for debug  by changing DEBUG to true,but it will make your MIDI board unable to send MIDI Message.
3
4#define  VALUE_MIN_RANGE 1
5#define DEBOUNCE_MS 100
6
7#define MIDI_MSG_NOTE_OFF 128  //or 0x80
8#define MIDI_MSG_NOTE_ON 144 //or 0x90
9#define MIDI_MSG_CTRL_CHANGE  176 //or 0xB0
10
11byte previous_values[2][8];
12byte previous_M_slide_value;
13unsigned  long btn_timer[2][8];
14//unsigned long timer = 0;
15
16void setup() {
17  
18  Serial.begin(115200);
19  previous_M_slide_value=-1;
20  for (int i = 0; i <  8; i++) {
21    previous_values[0][i] = -1;
22    previous_values[1][i] = -1;
23    btn_timer[0][i]=0;
24    btn_timer[1][i]=0;
25  }
26
27  pinMode(7, OUTPUT);
28  pinMode(6, OUTPUT);
29  pinMode(5, OUTPUT);
30
31}
32
33void loop() {
34
35  for (int i = 0; i < 8; i++) {
36    select(i);
37    int curr_value[2];
38    curr_value[0] = analogRead(A0);
39    curr_value[1] = analogRead(A1);
40    for  (byte side = 0; side < 2; side++) {
41      if (i != 3 && previous_values[side][i]  != (ATD(curr_value[side]) == 1 ? 0 : 127) && millis()>=btn_timer[side][i]) {
42//        When button is pressed.
43        byte val = ATD(curr_value[side]) == 1  ? 0 : 127;
44        previous_values[side][i] = val;
45        if (val == 127)  {
46          if (!DEBUG)sendNoteOn(0x39+side+i*2, val, 1);
47        } else if  (val == 0) {
48          if (!DEBUG)sendNoteOff(0x39+side+i*2, val, 1);
49          btn_timer[side][i]=millis()+DEBOUNCE_MS;
50        }
51      } else if (i == 3) {
52        int analog_val = map(curr_value[side],  0, 1023, 0, 127);
53        if (range(previous_values[side][i], analog_val, VALUE_MIN_RANGE)  != previous_values[side][i]) {
54//        When slider value is changed.
55          previous_values[side][i]  = analog_val;
56          if (!DEBUG)sendCtrlChange(0x39+side+i*2, previous_values[side][i],  1);
57        }
58      }
59    }
60    if(DEBUG)for(byte si=0;si<2;si++){
61      Serial.print(String(previous_values[si][i] + i * 150+si*150*8));
62      Serial.print(",");
63    }
64  }
65  if(DEBUG)Serial.println();
66  
67  int analog_val = map(analogRead(A2),  0, 1023, 0, 127);
68  if (range(previous_M_slide_value, analog_val, VALUE_MIN_RANGE)  != previous_M_slide_value) {
69    previous_M_slide_value = analog_val;
70    if  (!DEBUG)sendCtrlChange(0x57, previous_M_slide_value, 1);
71  }
72  
73  
74}
75
76
77void  printChart(int val) {
78  Serial.print(val);
79  Serial.print(",");
80}
81int  range(int previous, int current, int d) {
82//  This method compare previous value  and current value.
83//  If current value only increase or decrease "d",this  method will return previous value.
84//  If current value increase or decrease  "d" + >0 value ,this method will return current value.
85
86//example:
87//  previous=5;current=4;d=1
88//  return 5
89
90//  previous=5;current=3;d=1
91//  return 3
92
93  if (current == 127)return 127;
94  else if (current == 0)return  0;
95  if (current > previous && current - d == previous)return previous;
96  else  if (current < previous && previous - d == current)return previous;
97  else if  (current == previous)return previous;
98  return current;
99}
100
101bool ATD(int  analog_val) {
102//  Analog to digital
103//  analog_val:0~1023
104//  return 0  or 1.
105  if (((float)analog_val * 0.0048828125) > 2.94) {
106    return 1;
107  } else if (((float)analog_val * 0.0048828125) <= 1.47) {
108    return 0;
109  }
110}
111
112void select(int select) {
113//  CD4051 select
114//  C (MSB) :  S2  13  D7
115//  B       : S1  12  D6
116//  A (LSB) : S0  11  D5
117
118  for  (int inputPin = 0; inputPin < 3; inputPin++)
119  {
120    int pinState = bitRead(select,  inputPin);
121    digitalWrite(inputPin + 5, pinState);
122  }
123}
124
125//MIDI------------------------------------------
126void  sendNoteOn(byte note,byte velocity,byte channel){
127  sendChannelVoiceMsg(MIDI_MSG_NOTE_ON|(channel-1),note,velocity);
128  
129  }
130
131void sendNoteOff(byte note,byte velocity,byte channel){
132  sendChannelVoiceMsg(MIDI_MSG_NOTE_OFF|(channel-1),note,velocity);
133  }
134  
135void sendCtrlChange(byte cc,byte value,int channel) {
136  sendChannelVoiceMsg(MIDI_MSG_CTRL_CHANGE|(channel-1),cc,value);
137}
138
139void  sendChannelVoiceMsg(byte command, byte note, byte velocity) {
140  //send MIDI Channel  Voice Message
141  Serial.write(command);
142  Serial.write(note);
143  Serial.write(velocity);
144}

1<?xml version="1.0" encoding="UTF-8"?>
2<mapper device="arduino  VDJ Controller" version="802" date="2019-04-06">
3	<map value="BUTTON-L0"  action="deck left play_button" />
4	<map value="BUTTON-L1" action="deck  left stop_button" />
5	<map value="BUTTON-L2" action="deck left sync" />
6	<map  value="BUTTON-L3" action="deck left pitch_reset" />
7	<map value="BUTTON-L4"  action="deck left loop_half" />
8	<map value="BUTTON-L5" action="deck left  loop" />
9	<map value="BUTTON-L6" action="deck left loop_double" />
10	<map  value="BUTTON-R0" action="deck right play_button" />
11	<map value="BUTTON-R1"  action="deck right stop_button" />
12	<map value="BUTTON-R2" action="deck  right sync" />
13	<map value="BUTTON-R3" action="deck right pitch_reset"  />
14	<map value="BUTTON-R4" action="deck right loop_half" />
15	<map value="BUTTON-R5"  action="deck right loop" />
16	<map value="BUTTON-R6" action="deck right  loop_double" />
17	<map value="SLIDER-M0" action="crossfader" />
18	<map  value="SLIDER-L0" action="deck left filter" />
19	<map value="SLIDER-R0"  action="deck right filter" />
20	
21	
22	<map value="PAD-L0" action="deck  left hot_cue 1" />
23	<map value="PAD-L1" action="deck left hot_cue 2" />
24	<map  value="PAD-L2" action="deck left hot_cue 3" />
25	<map value="PAD-R0" action="deck  right hot_cue 1" />
26	<map value="PAD-R1" action="deck right hot_cue 2"  />
27	<map value="PAD-R2" action="deck right hot_cue 3" />
28</mapper>
29