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arduino-cli/libraries/Adafruit_Fingerprint_Sensor_Library/examples/emptyDatabase/emptyDatabase.ino

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+/***************************************************
+  This is an example sketch for our optical Fingerprint sensor
+  Designed specifically to work with the Adafruit Fingerprint sensor
+  ----> http://www.adafruit.com/products/751
+  These displays use TTL Serial to communicate, 2 pins are required to
+  interface
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing
+  products from Adafruit!
+  Written by Limor Fried/Ladyada for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include <Adafruit_Fingerprint.h>
+
+
+#if (defined(__AVR__) || defined(ESP8266)) && !defined(__AVR_ATmega2560__)
+// For UNO and others without hardware serial, we must use software serial...
+// pin #2 is IN from sensor (GREEN wire)
+// pin #3 is OUT from arduino  (WHITE wire)
+// Set up the serial port to use softwareserial..
+SoftwareSerial mySerial(2, 3);
+
+#else
+// On Leonardo/M0/etc, others with hardware serial, use hardware serial!
+// #0 is green wire, #1 is white
+#define mySerial Serial1
+
+#endif
+
+
+Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);
+
+void setup()
+{
+  Serial.begin(9600);
+  while (!Serial);  // For Yun/Leo/Micro/Zero/...
+  delay(100);
+
+  Serial.println("\n\nDeleting all fingerprint templates!");
+  Serial.println("Press 'Y' key to continue");
+
+  while (1) {
+    if (Serial.available() && (Serial.read() == 'Y')) {
+      break;
+    }
+  }
+
+  // set the data rate for the sensor serial port
+  finger.begin(57600);
+
+  if (finger.verifyPassword()) {
+    Serial.println("Found fingerprint sensor!");
+  } else {
+    Serial.println("Did not find fingerprint sensor :(");
+    while (1);
+  }
+
+  finger.emptyDatabase();
+
+  Serial.println("Now database is empty :)");
+}
+
+void loop() {
+}
+