Example Code for Arduino-Delete Fingerprint

Hardware Preparation

• DFRduino Leonardo (or similar) x 1
• Capacitive Fingerprint Sensor - UART (FPC Connector) × 1
• DuPont Wires

Software Preparation

• Arduino IDE
• Download and install the ID809 Library. (About how to install the library?)

Wiring Diagram

Sample Code

Run the codes, and press your finger on the sensor to delete your fingerprint.

/*!
 * @file fingerprintDeletion.ino
 * @brief Delete a specific fingerprint 
 * @n Experiment phenomenon：press your finger on the sensor, if this fingerprint is registered, delete it and LED lights up green.
                If it is unregistered or fingerprint collection fails, LED lights up red.
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (https://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author [Eddard]([email protected])
 * @version  V1.0
 * @date  2020-03-19
 * @get from https://www.dfrobot.com
 * @url https://github.com/DFRobot/DFRobot_ID809
*/
#include <DFRobot_ID809.h>

/*Use software serial when using UNO or NANO*/
#if ((defined ARDUINO_AVR_UNO) || (defined ARDUINO_AVR_NANO))
    #include <SoftwareSerial.h>
    SoftwareSerial Serial1(2, 3);  //RX, TX
    #define FPSerial Serial1
#else
    #define FPSerial Serial1
#endif

DFRobot_ID809 fingerprint;
//String desc;   //Error code information, enabling this function will consume much memory

void setup(){
  /*Initialize serial port for printing*/
  Serial.begin(9600);
  /*Initialize FPSerial*/
  FPSerial.begin(115200);
  /*Use FPSerial as communication serial port of module*/
  fingerprint.begin(FPSerial);
  /*Wait for Serial to open*/
  while(!Serial);
  /*Test whether device can communicate properly with mainboard,
    Return true or false
    */
  while(fingerprint.isConnected() == false){
    Serial.println("Communication with device failed, please check connection");
    /*Get error code information*/
    //desc = fingerprint.getErrorDescription();
    //Serial.println(desc);
    delay(1000);
  }
}

void loop(){
  uint8_t ret = 0;
  /*Set fingerprint LED ring mode, color, and number of blinks,
    Can be set as follows：
    Parameter 1:<LEDMode>
    eBreathing   eFastBlink   eKeepsOn    eNormalClose
    eFadeIn      eFadeOut     eSlowBlink   
    Parameter 2:<LEDColor>
    eLEDGreen  eLEDRed      eLEDYellow   eLEDBlue
    eLEDCyan   eLEDMagenta  eLEDWhite
    Parameter 3:<Number of blinks> 0 represents blinking all the time,
    This parameter will only be valid in mode eBreathing, eFastBlink, eSlowBlink
   */
  fingerprint.ctrlLED(/*LEDMode = */fingerprint.eBreathing, /*LEDColor = */fingerprint.eLEDBlue, /*blinkCount = */0);
  Serial.println("Please press the finger on the sensor to delete the fingerprint");
  /*Capture fingerprint image, 10s idle timeout, if timeout=0, disable the collection timeout function
    If succeed return 0, otherwise return ERR_ID809
   */
  if((fingerprint.collectionFingerprint(/*timeout=*/10)) != ERR_ID809){
    /*Compare the captured fingerprint with all the fingerprints in the fingerprint library,
      Return fingerprint ID(1-80) if succeed, return 0 when failed 
     */
    ret = fingerprint.search();
    /*Compare the captured fingerprint with a fingerprint of specific ID
      Return fingerprint ID(1-80) if succeed, return 0 when failed
     */
    if(ret != 0){
      /*Delete the fingerprint of this ID*/
      fingerprint.delFingerprint(/*Fingerprint ID = */ret);
      //fingerprint.delFingerprint(DELALL);  //Delete all fingerprints 
      Serial.print("delete successful,ID=");
      Serial.println(ret);
      /*Set fingerprint LED ring to always ON in green*/
      fingerprint.ctrlLED(/*LEDMode = */fingerprint.eKeepsOn, /*LEDColor = */fingerprint.eLEDGreen, /*blinkCount = */0);
    }else{
      Serial.println("Fingerprint is unregistered");
      /*Set fingerprint LED ring to always ON in red*/
      fingerprint.ctrlLED(/*LEDMode = */fingerprint.eKeepsOn, /*LEDColor = */fingerprint.eLEDRed, /*blinkCount = */0);
    }
  }else{
    Serial.println("Capturing fails");
    /*Get error code information*/
    //desc = fingerprint.getErrorDescription();
    //Serial.println(desc);
    /*Set fingerprint LED ring to always ON in red*/
    fingerprint.ctrlLED(/*LEDMode = */fingerprint.eKeepsOn, /*LEDColor = */fingerprint.eLEDRed, /*blinkCount = */0);
  }
  Serial.println("Please release your finger");
  /*Wait for finger to release
    Return 1 when finger is detected, otherwise return 0
   */
  while(fingerprint.detectFinger());

  /*Check whether the fingerprint ID has been registered
    Return 1 if registered, otherwise return 0
   */
//  if(fingerprint.getStatusID(/*Fingerprint ID = */FINGERPRINTID)){
//    Serial.println("ID has been registered");
//  }else{
//    Serial.println("ID is unregistered");
//  }
  Serial.println("-----------------------------");
  delay(1000);
}

Result