#include <MPR121.h>
#include <Wire.h>

#define switchElectrode 11
#define outputPin 13

void setup(){

  pinMode(outputPin, OUTPUT);
  digitalWrite(outputPin, LOW);

  Wire.begin();

  MPR121.begin(0x5C);

  MPR121.setInterruptPin(4);
  MPR121.updateTouchData();
}

void loop(){
  if(MPR121.touchStatusChanged()){
    MPR121.updateTouchData();
    if(MPR121.isNewTouch(switchElectrode)){
      digitalWrite(outputPin, !digitalRead(outputPin));
    }
  }
}