Added deleteModel(id) function

deleteModel function deletes a fingerprint from the sensor at the
specified ID

Adafruit_Fingerprint.cpp

@@ -101,6 +101,16 @@ uint8_t Adafruit_Fingerprint::storeModel(uint16_t id) {
   return packet[1];
 }
 
+uint8_t Adafruit_Fingerprint::deleteModel(uint16_t id) {
+    uint8_t packet[] = {FINGERPRINT_DELETE, id >> 8, id & 0xFF, 0x00, 0x01};
+    writePacket(theAddress, FINGERPRINT_COMMANDPACKET, sizeof(packet)+2, packet);
+    uint8_t len = getReply(packet);
+
+    if ((len != 1) && (packet[0] != FINGERPRINT_ACKPACKET))
+        return -1;
+    return packet[1];
+}
+
 uint8_t Adafruit_Fingerprint::emptyDatabase(void) {
   uint8_t packet[] = {FINGERPRINT_EMPTY};
   writePacket(theAddress, FINGERPRINT_COMMANDPACKET, sizeof(packet)+2, packet);

Adafruit_Fingerprint.h

@@ -60,6 +60,7 @@
 #define FINGERPRINT_IMAGE2TZ 0x02
 #define FINGERPRINT_REGMODEL 0x05
 #define FINGERPRINT_STORE 0x06
+#define FINGERPRINT_DELETE 0x0C
 #define FINGERPRINT_EMPTY 0x0D
 #define FINGERPRINT_VERIFYPASSWORD 0x13
 #define FINGERPRINT_HISPEEDSEARCH 0x1B
@@ -83,8 +84,10 @@ class Adafruit_Fingerprint {
   uint8_t getImage(void);
   uint8_t image2Tz(uint8_t slot = 1);
   uint8_t createModel(void);
+
   uint8_t emptyDatabase(void);
   uint8_t storeModel(uint16_t id);
+  uint8_t deleteModel(uint16_t id);
   uint8_t fingerFastSearch(void);
   uint8_t getTemplateCount(void);
   void writePacket(uint32_t addr, uint8_t packettype, uint16_t len, uint8_t *packet);

examples/Leo_passthru/Leo_passthru.ino

@@ -0,0 +1,21 @@
+//Leo_passthru
+// Allows Leonardo to pass serial data between fingerprint reader and Windows.
+//
+// Red connects to +5V
+// Black connects to Ground
+// Green goes to Digital 0
+// White goes to Digital 1
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial1.begin(57600);
+  Serial.begin(57600);
+}
+
+void loop() {
+
+  while (Serial.available())
+    Serial1.write(Serial.read());
+  while (Serial1.available())
+    Serial.write(Serial1.read());
+}

examples/delete/delete.ino

@@ -0,0 +1,91 @@
+/*************************************************** 
+  This is an example sketch for our optical Fingerprint sensor
+
+  Designed specifically to work with the Adafruit BMP085 Breakout 
+  ----> 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 ARDUINO >= 100
+ #include <SoftwareSerial.h>
+#else
+ #include <NewSoftSerial.h>
+#endif
+
+uint8_t getFingerprintEnroll(uint8_t id);
+
+
+// pin #2 is IN from sensor (GREEN wire)
+// pin #3 is OUT from arduino  (WHITE wire)
+#if ARDUINO >= 100
+SoftwareSerial mySerial(2, 3);
+//#define mySerial Serial1
+#else
+NewSoftSerial mySerial(2, 3);
+#endif
+
+  Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);
+
+void setup()  
+{
+  Serial.begin(9600);
+  Serial.println("Delete Finger");
+
+  // 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);
+  }
+}
+
+void loop()                     // run over and over again
+{
+  Serial.println("Type in the ID # you want delete...");
+  uint8_t id = 0;
+  while (true) {
+    while (! Serial.available());
+    char c = Serial.read();
+    if (! isdigit(c)) break;
+    id *= 10;
+    id += c - '0';
+  }
+  Serial.print("deleting ID #");
+  Serial.println(id);
+
+  deleteFingerprint(id);
+}
+
+uint8_t deleteFingerprint(uint8_t id) {
+  uint8_t p = -1;
+
+  p = finger.deleteModel(id);
+
+  if (p == FINGERPRINT_OK) {
+    Serial.println("Deleted!");
+  } else if (p == FINGERPRINT_PACKETRECIEVEERR) {
+    Serial.println("Communication error");
+    return p;
+  } else if (p == FINGERPRINT_BADLOCATION) {
+    Serial.println("Could not delete in that location");
+    return p;
+  } else if (p == FINGERPRINT_FLASHERR) {
+    Serial.println("Error writing to flash");
+    return p;
+  } else {
+    Serial.print("Unknown error: 0x"); Serial.println(p, HEX);
+    return p;
+  }   
+}