#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; volgen int volume_mp3 = 15; del between volume changes int del = 40; 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)) ) {
    // fade-out try to avoid clip stop/start (clipping anyway...)
   mp3_set_volume (volume_mp3 - 4);
   delay (del);
   mp3_set_volume (volume_mp3 - 7);
   delay (del);
   mp3_set_volume (volume_mp3 - 10);
   delay (del);
   mp3_set_volume (volume_mp3 - 15);
   delay (del);
   mp3_stop ();
   delay (del);
   mp3_set_volume (volume_mp3 - 10);
   delay (del);
   mp3_set_volume (volume_mp3 - 7);
   delay (del);
   mp3_set_volume (volume_mp3 - 4);
   delay (del);
   mp3_set_volume (volume_mp3);
   delay (del);
   mp3_play (i);
   delay (100);
  }

}

reset our state lasttouched = currtouched; put a delay so it isn't overwhelming

delay(100);

} </code>