Simultaneous Button Press for Synthesizer

Projects General Guidance
1

Hey! My name is Andrew, this is my first time posting. I am working on prototyping a synthesizer based off of this thing called the Omnichord made in the 80s. I am using the SparkFun MP3 Shield to handle the audio.

So far, I have 4 buttons that each trigger a different audio sample. I am trying to make it work that if you press button 4 + button 1 simultaneously, then it will trigger a 5th audio sample. I can't get it to work. Any help would be greatly appreciated, here is my code. Thank you!

#include <SPI.h>
#include <SdFat.h>
#include <SFEMP3Shield.h>
#include <Bounce2.h>

#define B_ONE A0

#define B_TWO A1

#define B_THREE A2

#define B_FOUR A3

#define BUTTON_DEBOUNCE_PERIOD 20  //ms

SdFat sd;

SFEMP3Shield MP3player;

Bounce b_One = Bounce();

Bounce b_Two = Bounce();

Bounce b_Three = Bounce();

Bounce b_Four = Bounce();

int8_t current_track = 0;



void setup() {
  Serial.begin(9600);


  pinMode(B_ONE, INPUT_PULLUP);
  pinMode(B_TWO, INPUT_PULLUP);
  pinMode(B_THREE, INPUT_PULLUP);
  pinMode(B_FOUR, INPUT_PULLUP);

  b_One.attach(B_ONE);
  b_One.interval(BUTTON_DEBOUNCE_PERIOD);
  b_Two.attach(B_TWO);
  b_Two.interval(BUTTON_DEBOUNCE_PERIOD);
  b_Three.attach(B_THREE);
  b_Three.interval(BUTTON_DEBOUNCE_PERIOD);
  b_Four.attach(B_FOUR);
  b_Four.interval(BUTTON_DEBOUNCE_PERIOD); 

  if (!sd.begin(9, SPI_HALF_SPEED)) sd.initErrorHalt();
  if (!sd.chdir("/")) sd.errorHalt("sd.chdir");

  MP3player.begin();
  MP3player.setVolume(10, 10);

void loop(){  
  
  {
    if (b_One.update()) {
      if (b_One.read() == LOW) {
        MP3player.playTrack(3);
      }
      
      
      if (b_One.read() == HIGH) {
        MP3player.stopTrack();
 
      }
    }

     if (b_Two.update()) {
      if (b_Two.read() == LOW) {

        MP3player.playTrack(2);
      }

      if (b_Two.read() == HIGH) {
        MP3player.stopTrack();
      }
    }
    if (b_Three.update()) {
      if (b_Three.read() == LOW) {
        MP3player.playTrack(1);
      }

      if (b_Three.read() == HIGH) {
        MP3player.stopTrack();
      }
    }
    if (b_Four.update()) {
      if (b_Four.read() == LOW) {
        MP3player.playTrack(4);
      }

      if (b_Four.read() == HIGH) {
        MP3player.stopTrack();
      }
 }
    if (b_Four.update() && b_One.update()) {
      if (b_Four.read() == LOW && b_One.read() == LOW)
      {
 
        MP3player.playTrack(5);
      }

      if (b_Four.read() == HIGH && b_One.read() == HIGH) {
        MP3player.stopTrack();
   
      }
}

}
  }
2

When posting code the next time, please use the autoformat, Ctrl + t, or the tab in the tools menue of the IDE. Doing that errors are often shows up due to curly brakets placed wrongly.

One of the two buttons will always be detected first. Take action, no logic knows if, or when, a second button is pressed. As long as button 4 is active also check for button 1. If button 1 goes active, change the action to number 5.

1 Like
3

Thanks so much. That has worked! And thanks for the tip on formatting. Here is my code if anyones looking to solve this problem in the future:

 if (b_Four.update()) {
      if (b_Four.read() == LOW) {
        (b_One.update()); {
          if (b_One.read() == LOW ){
        MP3player.playTrack(5);
          }
        }
4

Nice. Thanks for telling and marking the reply as "Solution".

5

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