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void setup() {
  // open a serial connection
  Serial.begin(9600);
}

void loop() {
  // read the input on A3 at default resolution (10 bits)
  // and send it out the serial connection
  analogReadResolution(10);
  Serial.print("ADC 10-bit (default) : ");
  Serial.print(analogRead(A3));

  // change the resolution to 12 bits and read A3
  analogReadResolution(12);
  Serial.print(", 12-bit : ");
  Serial.print(analogRead(A3));

  // change the resolution to 16 bits and read A3
  analogReadResolution(16);
  Serial.print(", 16-bit : ");
  Serial.print(analogRead(A3));

  // change the resolution to 8 bits and read A3
  analogReadResolution(8);
  Serial.print(", 8-bit : ");
  Serial.println(analogRead(A3));

  // a little delay to not hog Serial Monitor
  delay(100);
}