Example code for Arduino-Display fingerprint images

Requirements

• Hardware

  • DFRduino Leonardo (or similar) x 1
  • ID809 Capacitive Fingerprint Module x1
  • Dupont Wires

• Software

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

Connection Diagram

Leonardo Connection

UNO Connection

Sample Code 8-Display fingerprint images

This example will demonstrate collecting and displaying fingerprint images, and storing them in SD card.

Other devices used in this example

DFR0652 Firebeetle Board-M0 (V1.0)

DFR0664 Fermion: 2.0" 320x240 IPS TFT LCD Display with MicroSD Card (Breakout)

Note: Since the image data is relatively large, please use a high-performance main controller. Firebeetle Board-M0 can only display a quarter of the image. If using other main controller, please select the corresponding serial port and modify the codes of SD card according to the controller.

/*!
 *@file getQuarterFingerImage.ino
 *@brief Store the collected fingerprint image in the SD card and display it on the screen, can select to obtain quarter image or full image
 *This example needs to be used with screen, SD card，and high-performance main controllers. 
 *@copyright   Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 *@licence     The MIT License (MIT)
 *@author [fengli]([email protected])
 *@version  V1.0
 *@date  2021-6-01
 *@get from https://www.dfrobot.com
 *@https://github.com/DFRobot/DFRobot_ID809
*/
#include <DFRobot_ID809.h>
#include "bmpHeader.h"
#include <SD.h>
#include "DFRobot_GDL.h"
//Custom communication pins
/*M0*/
#if defined ARDUINO_SAM_ZERO
#define TFT_DC  7
#define TFT_CS  5
#define TFT_RST 6
/*ESP32*/
#elif defined ESP32
#define TFT_DC  D7
#define TFT_CS  D8
#define TFT_RST D9
/* AVR series mainboard */
#else
#define TFT_DC  2
#define TFT_CS  3
#define TFT_RST 4
#endif


/*Choose the serial port according to the main controller you use*/
#define FPSerial Serial1

DFRobot_ILI9341_240x320_HW_SPI  screen(/*dc=*/TFT_DC,/*cs=*/TFT_CS,/*rst=*/TFT_RST);
DFRobot_ID809 fingerprint;
//String desc;
File myFile;

#define QUARTER
#ifdef  QUARTER
uint8_t data[6400];   //Quarter image
#else
uint8_t data[25600];  //Full image
#endif

void setup(){
  /*Init print serial port */
  Serial.begin(9600);
  /*Init FPSerial*/
  FPSerial.begin(115200);
  /*Take FPSerial as communication port of fingerprint module */
  fingerprint.begin(FPSerial);
  screen.begin();
  screen.fillScreen(0xFFFF);
  /*Wait for Serial to open*/
  /*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);
  }
  /*Initialize the SD card module according to SD library corresponding to the main controller*/
  while(!SD.begin(/*csPin = */3, /*type = */TYPE_NONBOARD_SD_MOUDLE)) {
    SerialUSB.println("initialization failed!");
    delay(1000);
  }
}

void loop(){
  /*Set the fingerprint module LED ring to blue breathing lighting effect*/
  fingerprint.ctrlLED(/*LEDMode = */fingerprint.eBreathing, /*LEDColor = */fingerprint.eLEDBlue, /*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());
  #ifdef  QUARTER   //Collect quarter images
  fingerprint.getQuarterFingerImage(data);
  #else  //Collect full images
  fingerprint.getFingerImage(data);
  #endif
  myFile = SD.open("finger.bmp", FILE_WRITE);
  #ifdef  QUARTER
  myFile.write((const char *)bmpHeader, sizeof(bmpHeader));
  for(uint8_t i = 0;i < 13 ;i++){
    if(i == 12){
      myFile.write((const char *)data+i*512, 256);
      break;
      }
    myFile.write((const char *)data+i*512, 512);
    }
    myFile.close(); 
   //Display the image on the screen
   for(uint16_t i = 0; i < 6400 ;i++){
     uint8_t a = i % 80;
     uint8_t b = i / 80;
     screen.drawPixel(80+a,120+b,(data[i]/4)<<5);
  
   }
  #else
  //Save the picture in bmp format to SD card
  bmpHeader[18] = 0xa0;
  bmpHeader[22] = 0xa0;
  myFile.write((const char *)bmpHeader, sizeof(bmpHeader));
  for(uint8_t i = 0;i < 50 ;i++){
    myFile.write((const char *)data+i*512, 512);
    }
  myFile.close(); 
  //Display the image on the screen
  for(uint16_t i = 0; i < 25600 ;i++){
     uint8_t a = i % 160;
     uint8_t b = i / 160;
     screen.drawPixel(40+a,80+b,(data[i]/4)<<5);
   }
  #endif
  while(1);
}