Demos how to use the https://github.com/BareConductive/mpr121 library to get touch values and proximity values from each electrode.

mpr121-basic.ino

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

#define numElectrodes 12

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

  // Setup MPR121
  MPR121.begin( 0x5A );
  MPR121.setInterruptPin( 4 );
  MPR121.setTouchThreshold( 40 );
  MPR121.setReleaseThreshold( 20 );
}

void loop() {
  // Check for new data
  MPR121.updateTouchData();
  MPR121.updateFilteredData();

  // Get an analog proximity value
  Serial.print( MPR121.getFilteredData( 1 ) );

  // Get a touched/not touched value
  if ( MPR121.getTouchData( 1 ) ) {
    Serial.println( " - Touching" );
  } else {
    Serial.println( " - Not Touching" );
  }
}

Lovely example 👍