sierra070
Published © GPL3+

MIDI Pedal Board for guitar multieffect FX-500

A pedal board to send MIDI Program Change to my old guitar multieffect that has a MIDI IN port.

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MIDI Pedal Board for guitar multieffect FX-500

Things used in this project

Hardware components

Arduino Micro
Arduino Micro
×1
Resistor 10k ohm
Resistor 10k ohm
×6
Resistor 220 ohm
Resistor 220 ohm
×2
DIN Audio / Video Connector, 5 Contacts
DIN Audio / Video Connector, 5 Contacts
×1
Alphanumeric LCD, 20 x 4
Alphanumeric LCD, 20 x 4
×1
SNAP ACTION SWITCH Z15G1307
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)

Story

Read more

Schematics

MIDI pedal board schematic

Code

MIDI pedal board Arduino code

Arduino
/*
5v-tx-gnd-

pin 7-8-9-10-11-12
pos 1-2-3- 4 -5-AB
*/

#include <MIDI.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 20 chars and 4 line display

MIDI_CREATE_DEFAULT_INSTANCE();
String bank ="A";
int effA1=10;
int effA2=20;
int effA3=30;
int effA4=40;
int effA5=50;
int effB1=12;
int effB2=22;
int effB3=32;
int effB4=42;
int effB5=52;
int PedBankAB = 0;
int Ped1 = 0;int Ped2 = 0;int Ped3 = 0;int Ped4 = 0;int Ped5 = 0;
int PrCh =0;
int activePedal=1;
long lastDebounceTime=0; //the last time the output pin was toggled
long debounceDelay=800;//the debounce time; increase if the output flickers

void setup() {
  // put your setup code here, to run once:
  pinMode(7, INPUT);pinMode(8, INPUT);pinMode(9, INPUT);pinMode(10, INPUT);pinMode(11, INPUT);
  pinMode(12, INPUT);
  MIDI.begin(14);
  MIDI.sendProgramChange(effA1, 1);
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
  lcd.clear(); //pulisci lo schermo
  lcd.setCursor(0, 0); lcd.print("   YAMAHA FX-500");
  lcd.setCursor(0, 1); lcd.print("Bank: ");lcd.print(bank);
  lcd.setCursor(0, 2); lcd.print("Mem: ");lcd.print(effA1);
  lcd.setCursor(0, 3); lcd.print("Ped: ");lcd.print(activePedal);
}

void loop() {
  // put your main code here, to run repeatedly:
  Ped1 = digitalRead(7);  Ped2 = digitalRead(8);  Ped3 = digitalRead(9);  Ped4 = digitalRead(10);  Ped5 = digitalRead(11);
  PedBankAB = digitalRead(12);    
  if((millis()-lastDebounceTime)>debounceDelay) {
    // pressing bank (A or B)  
    if (PedBankAB == HIGH) {
      if (bank=="A") {bank="B";
        if (activePedal==1) {PrCh=effB1;}
        if (activePedal==2) {PrCh=effB2;}
        if (activePedal==3) {PrCh=effB3;}
        if (activePedal==4) {PrCh=effB4;}
        if (activePedal==5) {PrCh=effB5;}
        MIDI.sendProgramChange(PrCh, 1);
        lastDebounceTime=millis(); //set the current time
        } 
    else {bank="A";
        if (activePedal==1) {PrCh=effA1;}
        if (activePedal==2) {PrCh=effA2;}
        if (activePedal==3) {PrCh=effA3;}
        if (activePedal==4) {PrCh=effA4;}
        if (activePedal==5) {PrCh=effA5;}
        MIDI.sendProgramChange(PrCh, 1);
        lastDebounceTime=millis(); //set the current time
        }
    }
    // pressing pedal 1 to 5 
    if (Ped1 == HIGH) {
      activePedal= 1;
      if (bank == "A") {PrCh= effA1;}
      if (bank == "B") {PrCh= effB1;}
      MIDI.sendProgramChange(PrCh, 1);
      lastDebounceTime=millis(); //set the current time
    }
    if (Ped2 == HIGH) {
      activePedal= 2;
      if (bank == "A") {PrCh= effA2;}
      if (bank == "B") {PrCh= effB2;}
      MIDI.sendProgramChange(PrCh, 1);
      lastDebounceTime=millis(); //set the current time
    }
    if (Ped3 == HIGH) {
      activePedal= 3;
      if (bank == "A") {PrCh= effA3;}
      if (bank == "B") {PrCh= effB3;}
      MIDI.sendProgramChange(PrCh, 1);
      lastDebounceTime=millis(); //set the current time
    }
    if (Ped4 == HIGH) {
      activePedal= 4;
      if (bank == "A") {PrCh= effA4;}
      if (bank == "B") {PrCh= effB4;}
      MIDI.sendProgramChange(PrCh, 1);
      lastDebounceTime=millis(); //set the current time
    }
    if (Ped5 == HIGH) {
      activePedal= 5;
      if (bank == "A") {PrCh= effA5;}
      if (bank == "B") {PrCh= effB5;}
      MIDI.sendProgramChange(PrCh, 1);
      lastDebounceTime=millis(); //set the current time
    }
    lcd.setCursor(0, 1); lcd.print("Bank: ");lcd.print(bank);
    lcd.setCursor(0, 2); lcd.print("Mem: ");lcd.print(PrCh);
    lcd.setCursor(0, 3); lcd.print("Ped: ");lcd.print(activePedal);
      
  }
}

MIDI pedal board Arduino code

Arduino
This is the last version (9 Jan 2022) for ten (2x5) effects for three different guitars.
/*
5v-tx-gnd-
pin 7-8-9-10-11-12
pos 1-2-3- 4 -5-AB
*/

#include <MIDI.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 20 chars and 4 line display

MIDI_CREATE_DEFAULT_INSTANCE();
String Guitar[3] = {"Guitar 1   ","Guitar 2   ","Guitar 3   "};//write here your guitar models max eleven chr
char bank[2] ={'A','B'};
int effG1A[5]={61,2,3,4,5};//write here memory for Guitar 1 bank A
int effG1B[5]={6,7,8,9,10};//write here memory for Guitar 1 bank B
int effG2A[5]={11,12,13,14,15};//write here memory for Guitar 2 bank A
int effG2B[5]={16,17,18,19,20};//write here memory for Guitar 2 bank B
int effG3A[5]={21,22,23,24,25};//write here memory for Guitar 3 bank A
int effG3B[5]={26,27,28,29,30};//write here memory for Guitar 3 bank B
int g=0; //array index for Guitar[3]
int b=0; //array index for bank[2]
int PedBankAB = 0;
int Ped1 = 0;int Ped2 = 0;int Ped3 = 0;int Ped4 = 0;int Ped5 = 0;
int PrCh =0;
int activePedal=1;
long lastDebounceTime=0; //the last time the output pin was toggled
long debounceDelay=800;//the debounce time; increase if the output flickers

void setup() {
  // put your setup code here, to run once:
  pinMode(7, INPUT);pinMode(8, INPUT);pinMode(9, INPUT);pinMode(10, INPUT);pinMode(11, INPUT);
  pinMode(12, INPUT);
  MIDI.begin(MIDI_CHANNEL_OMNI);
  MIDI.sendProgramChange(effG1A[0], 1);
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
  lcd.clear(); //pulisci lo schermo
  lcd.setCursor(0, 0); lcd.print("YAMAHA FX-500 3G 2x5");
  lcd.setCursor(0, 1); lcd.print("Bank: ");lcd.print(bank[0]);
  lcd.setCursor(0, 2); lcd.print("Mem: ");lcd.print(effG1A[0]);
  lcd.setCursor(0, 3); lcd.print("Ped: ");lcd.print(activePedal);lcd.setCursor(9, 3);lcd.print(Guitar[0]);
}

void loop() {
  // put your main code here, to run repeatedly:
  Ped1 = digitalRead(7);  Ped2 = digitalRead(8);  Ped3 = digitalRead(9);  Ped4 = digitalRead(10);  Ped5 = digitalRead(11);
  PedBankAB = digitalRead(12);    
  if((millis()-lastDebounceTime)>debounceDelay) {
     // change guitar, pressing Ped1 and PedBankAB 
    if (PedBankAB == HIGH && Ped1==HIGH) {
      g=g+1; if (g==3){g=0;}
      switch (g){
        case 0:
          b=0;activePedal=1;
          MIDI.sendProgramChange(effG1A[0], 1);
          lcd.setCursor(0, 1); lcd.print("Bank: ");lcd.print(bank[0]);
          lcd.setCursor(0, 2); lcd.print("Mem: ");lcd.print(effG1A[0]);
          lcd.setCursor(0, 3); lcd.print("Ped: ");lcd.print(activePedal);lcd.setCursor(9, 3);lcd.print(Guitar[g]);
          break;
        case 1:
          b=0;activePedal=1;
          MIDI.sendProgramChange(effG2A[0], 1);
          lcd.setCursor(0, 1); lcd.print("Bank: ");lcd.print(bank[0]);
          lcd.setCursor(0, 2); lcd.print("Mem: ");lcd.print(effG2A[0]);
          lcd.setCursor(0, 3); lcd.print("Ped: ");lcd.print(activePedal);lcd.setCursor(9, 3);lcd.print(Guitar[g]);
          break;
        case 2:
          b=0;activePedal=1;
          MIDI.sendProgramChange(effG3A[0], 1);
          lcd.setCursor(0, 1); lcd.print("Bank: ");lcd.print(bank[0]);
          lcd.setCursor(0, 2); lcd.print("Mem: ");lcd.print(effG3A[0]);
          lcd.setCursor(0, 3); lcd.print("Ped: ");lcd.print(activePedal);lcd.setCursor(9, 3);lcd.print(Guitar[g]);      
          break;
        }
        lastDebounceTime=millis(); //set the current time
    }

    
    // change bank pressing PedBankAB (A or B)  
    if (PedBankAB == HIGH) {
      b=b+1; if (b==2){b=0;}
      lcd.setCursor(6, 1);lcd.print(bank[b]); lcd.print("  !ARMED!    ");
      lastDebounceTime=millis(); //set the current time
      }
    // pressing pedal 1 to 5 
    if (Ped1 == HIGH) {
      activePedal= 1;
      switch (g){
        case 0:
          if (b == 0) {PrCh= effG1A[activePedal-1];}
          if (b == 1) {PrCh= effG1B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 1:
          if (b == 0) {PrCh= effG2A[activePedal-1];}
          if (b == 1) {PrCh= effG2B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 2:
          if (b == 0) {PrCh= effG3A[activePedal-1];}
          if (b == 1) {PrCh= effG3B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        }
        lastDebounceTime=millis(); //set the current time
    }
    if (Ped2 == HIGH) {
      activePedal= 2;
      switch (g){
        case 0:
          if (b == 0) {PrCh= effG1A[activePedal-1];}
          if (b == 1) {PrCh= effG1B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 1:
          if (b == 0) {PrCh= effG2A[activePedal-1];}
          if (b == 1) {PrCh= effG2B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 2:
          if (b == 0) {PrCh= effG3A[activePedal-1];}
          if (b == 1) {PrCh= effG3B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        }
    }
    if (Ped3 == HIGH) {
      activePedal= 3;
      switch (g){
        case 0:
          if (b == 0) {PrCh= effG1A[activePedal-1];}
          if (b == 1) {PrCh= effG1B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 1:
          if (b == 0) {PrCh= effG2A[activePedal-1];}
          if (b == 1) {PrCh= effG2B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 2:
          if (b == 0) {PrCh= effG3A[activePedal-1];}
          if (b == 1) {PrCh= effG3B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        }
    }
    if (Ped4 == HIGH) {
      activePedal= 4;
      switch (g){
        case 0:
          if (b == 0) {PrCh= effG1A[activePedal-1];}
          if (b == 1) {PrCh= effG1B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 1:
          if (b == 0) {PrCh= effG2A[activePedal-1];}
          if (b == 1) {PrCh= effG2B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 2:
          if (b == 0) {PrCh= effG3A[activePedal-1];}
          if (b == 1) {PrCh= effG3B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        }
    }
    if (Ped5 == HIGH) {
      activePedal= 5;
      switch (g){
        case 0:
          if (b == 0) {PrCh= effG1A[activePedal-1];}
          if (b == 1) {PrCh= effG1B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 1:
          if (b == 0) {PrCh= effG2A[activePedal-1];}
          if (b == 1) {PrCh= effG2B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        case 2:
          if (b == 0) {PrCh= effG3A[activePedal-1];}
          if (b == 1) {PrCh= effG3B[activePedal-1];}
          MIDI.sendProgramChange(PrCh, 1);lcd.setCursor(9, 1); lcd.print("in  use");
          break;
        }
    }
    lcd.setCursor(0, 1); lcd.print("Bank: ");lcd.print(bank[b]);
    lcd.setCursor(0, 2); lcd.print("Mem: ");lcd.print(PrCh);lcd.print("  ");
    lcd.setCursor(0, 3); lcd.print("Ped: ");lcd.print(activePedal);    
  }
}

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sierra070

sierra070

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