Adafruit Fingerprint Sensor Library

// Enroll a fingerprint and print its ID
#include <Adafruit_Fingerprint.h>
#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

void setup() {
  Serial.begin(9600);
  finger.begin(57600);
  if (finger.verifyPassword()) Serial.println("Sensor ready");
  else Serial.println("Wrong password");
}

void loop() {
  Serial.println("Place finger to enroll");
  getFingerprintEnroll();
  while (1);
}

uint8_t getFingerprintEnroll() {
  int p = -1;
  Serial.print("Waiting for valid finger...");
  while (p != FINGERPRINT_OK) { p = finger.getImage(); }
  finger.image2Tz(1);
  p = finger.createModel();
  if (p != FINGERPRINT_OK) return p;
  int id = finger.storeModel(1, 0); // store in slot 1
  Serial.print("Stored as ID #"); Serial.println(id);
  return id;
}