MIDI Merger and Patchbay

A MIDI merger and patchbay with MIDI expression capabilities for the ARKeytar Arduino MIDI controller or other devices, based on Mega 2560.

Oct 11, 2022

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midi

music

controller

Components and supplies

Arduino Mega 2560 Rev3

Toggle Switch, SPDT

MIDI 5 pins connector DIN 41524

Metal Enclosure, Electrical / Industrial

Rotary Encoder with Push-Button

Stereo jack socket

3PDT STOMP FOOT / PEDAL SWITCH

Tools and machines

Soldering iron (generic)

Solder Wire, Lead Free

Apps and platforms

Arduino IDE

Project description

Code

MIDI merger v1.11.1

arduino

1/*
2MIDI Merger v1.11.1
32022-10-16
4*/
5
6/* MIDI and ShiftIn  libraries */
7#include <MIDI.h>
8#include <ShiftIn.h>
9ShiftIn<2> shift;       //  Two shift registers
10
11
12/* A MIDI instance is created for each of the two  serial ports used */
13MIDI_CREATE_INSTANCE(HardwareSerial, Serial2, M1);
14MIDI_CREATE_INSTANCE(HardwareSerial,  Serial3, M2);
15
16
17
18/* Shift registers variables */
19int num;
20int  incoming;
21int newRegRead;
22
23/* Switches state. The variable contains: switch  number, first and second pin state */
24int s1[3] = {0,0,0};  int s1Old[3] = {0,0,0};
25int  s2[3] = {1,0,0};  int s2Old[3] = {1,0,0};
26int s3[2] = {2,0};    int s3Old[2]  = {2,0};
27
28int s4[3] = {3,0,0};  int s4Old[3] = {3,0,0};
29int s5[3] = {4,0,0};  int s5Old[3] = {4,0,0};
30int s6[2] = {5,0};    int s6Old[2] = {5,0};
31
32/*  Encoder and stomps state */
33int e[4] = {6,0,0,0}; int eOld[4] = {6,0,0,0};
34int  f[4] = {7,0,0,0}; int fOld[4] = {7,0,0,0};
35
36/* Leds */
37const int ledR =  43;
38const int ledG = 45;
39const int ledB = 41;
40const int ledPow = 39;
41int  ledList[4] = {ledB, ledR, ledG, ledPow};
42
43/* Pedals variables */
44const  int p[2] = {3,2};
45const int p2A = A4;
46int susVal[2];
47int susValOld[2];
48int  ccVal[2];
49int sPedal[5] = {0,0,0,0,0};
50
51int expVal[2];
52int expValOld[2];
53int  expcc[2];
54int expccOld[2];
55
56int button = 0; int buttonOld = 0;
57
58/*  Settings list */
59/* 	0. MIDI channel pedal 1, Digital			- Default: ch8
60		1.  MIDI channel pedal 2, Digital		  - Default: ch8
61		2. MIDI channel pedal 2,  Analog			  - Default: ch8
62		3. CC pedal 1, Digital				 	      - Default:  sustain
63		4. CC pedal 2, Digital					      - Default: sustain
64		5.  CC pedal 2, Analog					        - Default: volume
65*/
66int setting[6] =  {8, 8, 8, 1, 1, 2};
67/* The settings are:  0.midi channel for pedal 1; 
68                      1.  midi channel for pedal 2, digital
69                      2. midi channel for pedal  2, analog
70                      3. index for listcc, cc destination of pedal  1
71                      4. index for listcc, cc destination of pedal 2, digital
72                      5. index for listcc, cc destination of pedal 2, analog*/
73/*  Control change number to be selected for expression pedal */
74const int listCC[12]  = {64, 7, 74, 71, 11, 1, 5, 73, 91, 93, 72, 10};
75
76
77
78
79void setup()  {
80	/* turn on the "power on led" */
81	pinMode(ledPow, OUTPUT);
82	digitalWrite(ledPow,  HIGH);
83	
84	M1.begin(MIDI_CHANNEL_OMNI);
85	M2.begin(MIDI_CHANNEL_OMNI);
86	Serial.begin(9600);
87
88	/*  Shift registers setup */
89	shift.begin(4, 5, 6, 7);
90	if(shift.update())
91	incoming  = readShiftReg();
92	saveShiftReg();
93	e[1] = 0;
94
95	/* LEDs pins */
96	pinMode(ledR,  OUTPUT);
97	pinMode(ledG, OUTPUT);
98	pinMode(ledB, OUTPUT);
99	
100
101	/*  pedals */
102	pinMode(p2A, INPUT_PULLUP);
103	pinMode(p[0], INPUT_PULLUP);
104
105	/*  Defines digital/analog pedal behaviour */
106	/* Digital */
107	if (s3[1] == 0)  {
108		pinMode(p[1], INPUT_PULLUP);
109	}
110	/* Analog */
111	if (s3[1] ==  1) {
112		pinMode(p[1], OUTPUT);
113		digitalWrite(p[1], HIGH);
114	}
115	
116	/*  Blink the leds after setup is done */
117	for (int ii=0; ii<=2; ii++) {
118		digitalWrite(ledList[ii],HIGH);
119		delay(250);
120		digitalWrite(ledList[ii],LOW);
121	}
122}
123
124
125
126
127void  loop() {
128
129	shiftReg();
130	
131	merger();
132	merger();
133	merger();
134	
135	pedals();
136	
137	merger();
138	merger();
139	merger();
140
141}
142
143
144
145
146
147void  shiftReg() {
148
149	if(shift.update()) {newRegRead = 1;} else {newRegRead = 0;}  
150	incoming = readShiftReg();
151  
152	if(newRegRead){
153		saveShiftReg();
154	}
155}
156
157int  readShiftReg() {
158
159	for(int i = 0; i < shift.getDataWidth(); i++){
160		bitWrite(num,  i, shift.state(i));
161	}
162
163	int incomingNumber = 0;
164	for (int bitNumber  = 8; bitNumber <= 15; bitNumber++) {
165		bitWrite(incoming, incomingNumber, bitRead(num,bitNumber));
166		incomingNumber++;
167	}
168	for  (int bitNumber = 0; bitNumber <= 7; bitNumber++) {
169		bitWrite(incoming, incomingNumber,  bitRead(num,bitNumber));
170		incomingNumber++;
171	}
172	merger();
173	return  incoming;
174}
175
176
177
178void saveShiftReg() {
179	/* Assign shift register  values to variables */
180	e[1] = bitRead(incoming,0);
181	e[2] = bitRead(incoming,1);
182	e[3]  = bitRead(incoming,2);
183	f[1] = bitRead(incoming,3);
184	f[3] = bitRead(incoming,4);
185	f[2]  = bitRead(incoming,5);
186	s3[1] = bitRead(incoming,6);
187	s6[1] = bitRead(incoming,7);
188	
189	merger();
190	
191	s2[2]  = bitRead(incoming,8);
192	s2[1] = bitRead(incoming,9);
193	s1[2] = bitRead(incoming,10);
194	s1[1]  = bitRead(incoming,11);
195	s4[2] = bitRead(incoming,12);
196	s4[1] = bitRead(incoming,13);
197	s5[2]  = bitRead(incoming,14);
198	s5[1] = bitRead(incoming,15);
199	
200  sPedal[1]  = s4[2];
201  sPedal[2] = s4[1];
202  sPedal[3] = s5[2];
203  sPedal[4] = s5[1];
204	
205	
206	if  (s1[1] == 1) {
207		M1.turnThruOn();
208	}
209	if (s1[2] == 1) {
210		M1.turnThruOff();
211	}
212	if  (s1[1] == 0 && s1[2] == 0) {
213		M1.turnThruOn();
214	}
215	if (s2[2] == 1)  {
216		M2.turnThruOn();
217  }
218	if (s2[1] == 1) {
219		M2.turnThruOff();
220	}
221	if  (s2[1] == 0 && s2[2] == 0) {
222		M2.turnThruOff();
223	}
224	merger();
225}
226
227
228
229void  merger() {
230	/* Manages the MIDI routing */
231	if (M1.read()) {
232		if (s1[2]  == 1) {
233			M2.send(M1.getType(), M1.getData1(), M1.getData2(), M1.getChannel());
234		}
235		if  (s1[1] == 0 && s1[2] == 0) {
236			M2.send(M1.getType(), M1.getData1(), M1.getData2(),  M1.getChannel());
237		} 
238	}
239
240	if (M2.read()) {
241		if (s2[1] ==  1) {
242			M1.send(M2.getType(), M2.getData1(), M2.getData2(), M2.getChannel());
243		}  
244	}	
245	switchLed();
246}
247
248
249
250void switchLed() {
251  /* LED color  based on the MIDI message type */
252	switch(M1.getType()) {
253		case midi::NoteOn:
254			ledOn(ledG);
255			break;
256		case  midi::NoteOff:
257			ledOn(ledR);
258			break;
259		case midi::PitchBend:
260			ledOn(ledB);
261			break;
262		case  midi::ControlChange:
263			ledOn(ledR);
264			break;
265	}
266	switch(M2.getType())  {
267		case midi::NoteOn:
268			ledOn(ledG);
269			break;
270		case midi::NoteOff:
271			ledOn(ledR);
272			break;
273		case  midi::PitchBend:
274			ledOn(ledB);
275			break;
276		case midi::ControlChange:
277			ledOn(ledR);
278			break;
279  }
280	
281}
282
283
284
285void ledOn(int ledPin) {
286	/* Turns on the led  having pin number equal to the argument of the function.
287	Otherwise, it turns  the LED off */
288	for (int ii = ledList[0]; ii <= ledList[2]+2; ii = ii+2) {
289		if  (ledPin == ii) {
290			digitalWrite(ledPin, HIGH);
291		} else {
292			digitalWrite(ledPin,  LOW);
293		}
294	}     
295}
296
297
298
299void pedals() {
300	/* Manages the  pedals */
301
302	if (s3[1] != s3Old[1]) {
303		if (s3[1] == 1) {
304			pinMode(p[1],  INPUT_PULLUP);
305		} else if (s3[1] == 0) {
306			pinMode(p[1], OUTPUT);
307			digitalWrite(p[1],  HIGH);
308		}
309		s3Old[1] = s3[1];
310	}
311
312	for (int ii = 0; ii <=  1; ii++) {
313		
314		/* Always proceed with pedal 1 */
315		/* Proceed with  pedal two if it is set on digital/switch */
316		if (ii == 0 || ((s3[1] == 1)  && (ii == 1))) {
317			susVal[ii] = digitalRead(p[ii]);
318			if (susVal[ii]  != susValOld[ii]) {
319				if (susVal[ii] == 1) {
320					ccVal[ii] = 127;
321				}
322				if  (susVal[ii] == 0) {
323					ccVal[ii] = 0;
324				}
325				
326				if  (sPedal[ii*2+1] == 1) {
327					M1.sendControlChange(listCC[setting[ii+3]],ccVal[ii],setting[ii]);
328				}
329				if  (sPedal[ii*2+2] == 1) {
330					M2.sendControlChange(listCC[setting[ii+3]],ccVal[ii],setting[ii]);
331				}
332				if  (sPedal[ii*2+1] == 0 && sPedal[ii*2+2] == 0) {
333					M1.sendControlChange(listCC[setting[ii+3]],ccVal[ii],setting[ii]);
334					M2.sendControlChange(listCC[setting[ii+3]],ccVal[ii],setting[ii]);
335				}
336
337				susValOld[ii]  = susVal[ii];
338				merger();
339			}
340		}
341		
342		if (ii ==  1 && s3[1] == 0) {
343			expVal[1] = analogRead(p2A);
344			expcc[1] = map(expVal[1],30,1023,0,127);
345			
346			if  (expcc[1] != expccOld[1] && abs(expccOld[1]-expcc[1])>= 5) {
347				if (s5[1]  == 1) {
348					M1.sendControlChange(listCC[setting[2+3]],expcc[1],setting[2]);
349				}
350				if  (s5[2] == 1) {
351					M2.sendControlChange(listCC[setting[2+3]],expcc[1],setting[2]);
352				}
353				if  (s5[1] == 0 && s5[2] == 0) {
354					M1.sendControlChange(listCC[setting[2+3]],expcc[1],setting[2]);
355					M2.sendControlChange(listCC[setting[2+3]],expcc[1],setting[2]);
356				}
357				
358
359				expccOld[1]  = expcc[1];
360			}
361		}
362		merger();
363		
364	}
365
366}

/*
MIDI Merger v1.11.1
2022-10-16
*/

/* MIDI and ShiftIn  libraries */
#include <MIDI.h>
#include <ShiftIn.h>
ShiftIn<2> shift;       //  Two shift registers


/* A MIDI instance is created for each of the two  serial ports used */
MIDI_CREATE_INSTANCE(HardwareSerial, Serial2, M1);
MIDI_CREATE_INSTANCE(HardwareSerial,  Serial3, M2);



/* Shift registers variables */
int num;
int  incoming;
int newRegRead;

/* Switches state. The variable contains: switch  number, first and second pin state */
int s1[3] = {0,0,0};  int s1Old[3] = {0,0,0};
int  s2[3] = {1,0,0};  int s2Old[3] = {1,0,0};
int s3[2] = {2,0};    int s3Old[2]  = {2,0};

int s4[3] = {3,0,0};  int s4Old[3] = {3,0,0};
int s5[3] = {4,0,0};  int s5Old[3] = {4,0,0};
int s6[2] = {5,0};    int s6Old[2] = {5,0};

/*  Encoder and stomps state */
int e[4] = {6,0,0,0}; int eOld[4] = {6,0,0,0};
int  f[4] = {7,0,0,0}; int fOld[4] = {7,0,0,0};

/* Leds */
const int ledR =  43;
const int ledG = 45;
const int ledB = 41;
const int ledPow = 39;
int  ledList[4] = {ledB, ledR, ledG, ledPow};

/* Pedals variables */
const  int p[2] = {3,2};
const int p2A = A4;
int susVal[2];
int susValOld[2];
int  ccVal[2];
int sPedal[5] = {0,0,0,0,0};

int expVal[2];
int expValOld[2];
int  expcc[2];
int expccOld[2];

int button = 0; int buttonOld = 0;

/*  Settings list */
/* 	0. MIDI channel pedal 1, Digital			- Default: ch8
		1.  MIDI channel pedal 2, Digital		  - Default: ch8
		2. MIDI channel pedal 2,  Analog			  - Default: ch8
		3. CC pedal 1, Digital				 	      - Default:  sustain
		4. CC pedal 2, Digital					      - Default: sustain
		5.  CC pedal 2, Analog					        - Default: volume
*/
int setting[6] =  {8, 8, 8, 1, 1, 2};
/* The settings are:  0.midi channel for pedal 1; 
                      1.  midi channel for pedal 2, digital
                      2. midi channel for pedal  2, analog
                      3. index for listcc, cc destination of pedal  1
                      4. index for listcc, cc destination of pedal 2, digital
                      5. index for listcc, cc destination of pedal 2, analog*/
/*  Control change number to be selected for expression pedal */
const int listCC[12]  = {64, 7, 74, 71, 11, 1, 5, 73, 91, 93, 72, 10};




void setup()  {
	/* turn on the "power on led" */
	pinMode(ledPow, OUTPUT);
	digitalWrite(ledPow,  HIGH);
	
	M1.begin(MIDI_CHANNEL_OMNI);
	M2.begin(MIDI_CHANNEL_OMNI);
	Serial.begin(9600);

	/*  Shift registers setup */
	shift.begin(4, 5, 6, 7);
	if(shift.update())
	incoming  = readShiftReg();
	saveShiftReg();
	e[1] = 0;

	/* LEDs pins */
	pinMode(ledR,  OUTPUT);
	pinMode(ledG, OUTPUT);
	pinMode(ledB, OUTPUT);
	

	/*  pedals */
	pinMode(p2A, INPUT_PULLUP);
	pinMode(p[0], INPUT_PULLUP);

	/*  Defines digital/analog pedal behaviour */
	/* Digital */
	if (s3[1] == 0)  {
		pinMode(p[1], INPUT_PULLUP);
	}
	/* Analog */
	if (s3[1] ==  1) {
		pinMode(p[1], OUTPUT);
		digitalWrite(p[1], HIGH);
	}
	
	/*  Blink the leds after setup is done */
	for (int ii=0; ii<=2; ii++) {
		digitalWrite(ledList[ii],HIGH);
		delay(250);
		digitalWrite(ledList[ii],LOW);
	}
}




void  loop() {

	shiftReg();
	
	merger();
	merger();
	merger();
	
	pedals();
	
	merger();
	merger();
	merger();

}





void  shiftReg() {

	if(shift.update()) {newRegRead = 1;} else {newRegRead = 0;}  
	incoming = readShiftReg();
  
	if(newRegRead){
		saveShiftReg();
	}
}

int  readShiftReg() {

	for(int i = 0; i < shift.getDataWidth(); i++){
		bitWrite(num,  i, shift.state(i));
	}

	int incomingNumber = 0;
	for (int bitNumber  = 8; bitNumber <= 15; bitNumber++) {
		bitWrite(incoming, incomingNumber, bitRead(num,bitNumber));
		incomingNumber++;
	}
	for  (int bitNumber = 0; bitNumber <= 7; bitNumber++) {
		bitWrite(incoming, incomingNumber,  bitRead(num,bitNumber));
		incomingNumber++;
	}
	merger();
	return  incoming;
}



void saveShiftReg() {
	/* Assign shift register  values to variables */
	e[1] = bitRead(incoming,0);
	e[2] = bitRead(incoming,1);
	e[3]  = bitRead(incoming,2);
	f[1] = bitRead(incoming,3);
	f[3] = bitRead(incoming,4);
	f[2]  = bitRead(incoming,5);
	s3[1] = bitRead(incoming,6);
	s6[1] = bitRead(incoming,7);
	
	merger();
	
	s2[2]  = bitRead(incoming,8);
	s2[1] = bitRead(incoming,9);
	s1[2] = bitRead(incoming,10);
	s1[1]  = bitRead(incoming,11);
	s4[2] = bitRead(incoming,12);
	s4[1] = bitRead(incoming,13);
	s5[2]  = bitRead(incoming,14);
	s5[1] = bitRead(incoming,15);
	
  sPedal[1]  = s4[2];
  sPedal[2] = s4[1];
  sPedal[3] = s5[2];
  sPedal[4] = s5[1];
	
	
	if  (s1[1] == 1) {
		M1.turnThruOn();
	}
	if (s1[2] == 1) {
		M1.turnThruOff();
	}
	if  (s1[1] == 0 && s1[2] == 0) {
		M1.turnThruOn();
	}
	if (s2[2] == 1)  {
		M2.turnThruOn();
  }
	if (s2[1] == 1) {
		M2.turnThruOff();
	}
	if  (s2[1] == 0 && s2[2] == 0) {
		M2.turnThruOff();
	}
	merger();
}



void  merger() {
	/* Manages the MIDI routing */
	if (M1.read()) {
		if (s1[2]  == 1) {
			M2.send(M1.getType(), M1.getData1(), M1.getData2(), M1.getChannel());
		}
		if  (s1[1] == 0 && s1[2] == 0) {
			M2.send(M1.getType(), M1.getData1(), M1.getData2(),  M1.getChannel());
		} 
	}

	if (M2.read()) {
		if (s2[1] ==  1) {
			M1.send(M2.getType(), M2.getData1(), M2.getData2(), M2.getChannel());
		}  
	}	
	switchLed();
}



void switchLed() {
  /* LED color  based on the MIDI message type */
	switch(M1.getType()) {
		case midi::NoteOn:
			ledOn(ledG);
			break;
		case  midi::NoteOff:
			ledOn(ledR);
			break;
		case midi::PitchBend:
			ledOn(ledB);
			break;
		case  midi::ControlChange:
			ledOn(ledR);
			break;
	}
	switch(M2.getType())  {
		case midi::NoteOn:
			ledOn(ledG);
			break;
		case midi::NoteOff:
			ledOn(ledR);
			break;
		case  midi::PitchBend:
			ledOn(ledB);
			break;
		case midi::ControlChange:
			ledOn(ledR);
			break;
  }
	
}



void ledOn(int ledPin) {
	/* Turns on the led  having pin number equal to the argument of the function.
	Otherwise, it turns  the LED off */
	for (int ii = ledList[0]; ii <= ledList[2]+2; ii = ii+2) {
		if  (ledPin == ii) {
			digitalWrite(ledPin, HIGH);
		} else {
			digitalWrite(ledPin,  LOW);
		}
	}     
}



void pedals() {
	/* Manages the  pedals */

	if (s3[1] != s3Old[1]) {
		if (s3[1] == 1) {
			pinMode(p[1],  INPUT_PULLUP);
		} else if (s3[1] == 0) {
			pinMode(p[1], OUTPUT);
			digitalWrite(p[1],  HIGH);
		}
		s3Old[1] = s3[1];
	}

	for (int ii = 0; ii <=  1; ii++) {
		
		/* Always proceed with pedal 1 */
		/* Proceed with  pedal two if it is set on digital/switch */
		if (ii == 0 || ((s3[1] == 1)  && (ii == 1))) {
			susVal[ii] = digitalRead(p[ii]);
			if (susVal[ii]  != susValOld[ii]) {
				if (susVal[ii] == 1) {
					ccVal[ii] = 127;
				}
				if  (susVal[ii] == 0) {
					ccVal[ii] = 0;
				}
				
				if  (sPedal[ii*2+1] == 1) {
					M1.sendControlChange(listCC[setting[ii+3]],ccVal[ii],setting[ii]);
				}
				if  (sPedal[ii*2+2] == 1) {
					M2.sendControlChange(listCC[setting[ii+3]],ccVal[ii],setting[ii]);
				}
				if  (sPedal[ii*2+1] == 0 && sPedal[ii*2+2] == 0) {
					M1.sendControlChange(listCC[setting[ii+3]],ccVal[ii],setting[ii]);
					M2.sendControlChange(listCC[setting[ii+3]],ccVal[ii],setting[ii]);
				}

				susValOld[ii]  = susVal[ii];
				merger();
			}
		}
		
		if (ii ==  1 && s3[1] == 0) {
			expVal[1] = analogRead(p2A);
			expcc[1] = map(expVal[1],30,1023,0,127);
			
			if  (expcc[1] != expccOld[1] && abs(expccOld[1]-expcc[1])>= 5) {
				if (s5[1]  == 1) {
					M1.sendControlChange(listCC[setting[2+3]],expcc[1],setting[2]);
				}
				if  (s5[2] == 1) {
					M2.sendControlChange(listCC[setting[2+3]],expcc[1],setting[2]);
				}
				if  (s5[1] == 0 && s5[2] == 0) {
					M1.sendControlChange(listCC[setting[2+3]],expcc[1],setting[2]);
					M2.sendControlChange(listCC[setting[2+3]],expcc[1],setting[2]);
				}
				

				expccOld[1]  = expcc[1];
			}
		}
		merger();
		
	}

}

Downloadable files

MIDI ports on serial3

MIDI ports on serial2

Pedals

This scheme represents the wiring and setting of the interchangable digital/analog port. A switch is used to change between these two modes.

Pedals

Shift registers

A single switch position is represented as an example for the connection that is repeated for all the 8 central pins of each shift register. The central pin of a switch is connected to 5V, the two remaining pins are connected to the shift registers as indicated in the example.

Shift registers

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