Hello! I'm making a piece that is utilizing the Bare Conductive Touchboard with the proximity code that is provided on their website so the pads that I am painting are triggered by proximity (pretty straightforward).The issue I am running into is that when a track from the SD card is triggered while another is playing it stops the track and starts playing the more recently triggered track. Is there any way to alter the code so that the first track will continue to play during the triggering of the second track? I don't want the track to end abruptly, I want it to overlap. I am very new at this so any advice would be fantastic. Here is the code they provide for proximity:
// compiler error handling
#include "Compiler_Errors.h"
// touch includes
#include <MPR121.h>
#include <Wire.h>
#define MPR121_ADDR 0x5C
#define MPR121_INT 4
// mp3 includes
#include <SPI.h>
#include <SdFat.h>
#include <SdFatUtil.h>
#include <SFEMP3Shield.h>
// mp3 variables
SFEMP3Shield MP3player;
byte result;
int lastPlayed = 0;
// touch behaviour definitions
#define firstPin 0
#define lastPin 11
// sd card instantiation
SdFat sd;
// define LED_BUILTIN for older versions of Arduino
#ifndef LED_BUILTIN
#define LED_BUILTIN 13
#endif
void setup(){
Serial.begin(57600);
pinMode(LED_BUILTIN, OUTPUT);
//while (!Serial) ; {} //uncomment when using the serial monitor
Serial.println("Bare Conductive Proximity MP3 player");
if(!sd.begin(SD_SEL, SPI_HALF_SPEED)) sd.initErrorHalt();
if(!MPR121.begin(MPR121_ADDR)) Serial.println("error setting up MPR121");
MPR121.setInterruptPin(MPR121_INT);
// Changes from Touch MP3
// this is the touch threshold - setting it low makes it more like a proximity trigger
// default value is 40 for touch
MPR121.setTouchThreshold(5);
// this is the release threshold - must ALWAYS be smaller than the touch threshold
// default value is 20 for touch
MPR121.setReleaseThreshold(3);
result = MP3player.begin();
MP3player.setVolume(10,10);
if(result != 0) {
Serial.print("Error code: ");
Serial.print(result);
Serial.println(" when trying to start MP3 player");
}
}
void loop(){
readTouchInputs();
}
void readTouchInputs(){
if(MPR121.touchStatusChanged()){
MPR121.updateTouchData();
// only make an action if we have one or fewer pins touched
// ignore multiple touches
if(MPR121.getNumTouches()<=1){
for (int i=0; i < 12; i++){ // Check which electrodes were pressed
if(MPR121.isNewTouch(i)){
//pin i was just touched
Serial.print("pin ");
Serial.print(i);
Serial.println(" was just touched");
digitalWrite(LED_BUILTIN, HIGH);
if(i<=lastPin && i>=firstPin){
if(MP3player.isPlaying()){
if(lastPlayed==i){
// if we're already playing the requested track, stop it
MP3player.stopTrack();
Serial.print("stopping track ");
Serial.println(i-firstPin);
} else {
// if we're already playing a different track, stop that
// one and play the newly requested one
MP3player.stopTrack();
MP3player.playTrack(i-firstPin);
Serial.print("playing track ");
Serial.println(i-firstPin);
// don't forget to update lastPlayed - without it we don't
// have a history
lastPlayed = i;
}
} else {
// if we're playing nothing, play the requested track
// and update lastplayed
MP3player.playTrack(i-firstPin);
Serial.print("playing track ");
Serial.println(i-firstPin);
lastPlayed = i;
}
}
}else{
if(MPR121.isNewRelease(i)){
Serial.print("pin ");
Serial.print(i);
Serial.println(" is no longer being touched");
digitalWrite(LED_BUILTIN, LOW);
}
}
}
}
}
}