Example Code for Arduino-Display Fingerprint Images

Hardware Preparation

• DFR0652 Firebeetle 2 M0 Development Board x 1
• DFR0664 Fermion: 2.0" 320x240 IPS TFT LCD Display with MicroSD Card (Breakout) 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?)

Sample Code

This example will demonstrate how to collect and display fingerprint images, and store them in SD card.

Note: Since the image data is relatively large, please use a high-performance main controller. If you use 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 (https://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);
}