#include <SoftwareSerial.h>
#include <DFPlayer_Mini_Mp3.h>
#include <Wire.h>
#include "Adafruit_MPR121.h"
 
// You can have up to 4 on one i2c bus but one is enough for testing!
Adafruit_MPR121 cap = Adafruit_MPR121();
 
// Keeps track of the last pins touched
// so we know when buttons are 'released'
uint16_t lasttouched = 0;
uint16_t currtouched = 0;
 
void setup() {
  while (!Serial);        // needed to keep leonardo/micro from starting too fast!
 
  Serial.begin(9600);
  Serial.println("Adafruit MPR121 Capacitive Touch sensor test"); 
 
  // Default address is 0x5A, if tied to 3.3V its 0x5B
  // If tied to SDA its 0x5C and if SCL then 0x5D
  if (!cap.begin(0x5A)) {
    Serial.println("MPR121 not found, check wiring?");
    while (1);
  }
  Serial.println("MPR121 found!");
 
  mp3_set_serial (Serial);  //set Serial for DFPlayer-mini mp3 module 
  delay(1);  //wait 1ms for mp3 module to set volume
  mp3_set_volume (15);
}
 
void loop() {
  // Get the currently touched pads
  currtouched = cap.touched();
 
  for (uint8_t i=0; i<12; i++) {
    // it if *is* touched and *wasnt* touched before, alert!
    if ((currtouched & _BV(i)) && !(lasttouched & _BV(i)) ) {
      mp3_play (i);
      delay (100);
    }
 
  }
 
  // reset our state
  lasttouched = currtouched;
 
 
  // put a delay so it isn't overwhelming
  delay(100);
}