Arduino “having11” Guy
Published © GPL3+

Fingerprint Guarded Box

Use DFRobot's UART fingerprint scanner to store fingerprints and only allow authorized people to access the box.

BeginnerFull instructions provided1 hour517
Fingerprint Guarded Box

Things used in this project

Hardware components

Fingerprint Sensor
DFRobot Fingerprint Sensor
×1
DFRobot Particle Photon
×1
5mm LED
×2

Software apps and online services

Particle Build Web IDE
Particle Build Web IDE

Story

Read more

Schematics

Wiring

More Wiring

Code

Lock Box Code

C/C++
#include "Adafruit_Fingerprint.h"

int getFingerprintIDez();

const int red_led_pin = 2, green_led_pin = 3;

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&Serial1);

void setup()  
{
  Serial.begin(9600);

  // 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);
  }
  Serial.println("Waiting for valid finger...");
  pinMode(red_led_pin, OUTPUT);
  pinMode(green_led_pin, OUTPUT);
  digitalWrite(red_led_pin, 1);
  digitalWrite(green_led_pin, 0);
}

void loop()                     // run over and over again
{
  getFingerprintIDez();
}

uint8_t getFingerprintID() {
  uint8_t p = finger.getImage();
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image taken");
      break;
    case FINGERPRINT_NOFINGER:
      Serial.println("No finger detected");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_IMAGEFAIL:
      Serial.println("Imaging error");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }

  // OK success!

  p = finger.image2Tz();
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image converted");
      break;
    case FINGERPRINT_IMAGEMESS:
      Serial.println("Image too messy");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_FEATUREFAIL:
      Serial.println("Could not find fingerprint features");
      return p;
    case FINGERPRINT_INVALIDIMAGE:
      Serial.println("Could not find fingerprint features");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }
  
  // OK converted!
  p = finger.fingerFastSearch();
  if (p == FINGERPRINT_OK) {
    Serial.println("Found a print match!");
  } else if (p == FINGERPRINT_PACKETRECIEVEERR) {
    Serial.println("Communication error");
    return p;
  } else if (p == FINGERPRINT_NOTFOUND) {
    Serial.println("Did not find a match");
    return p;
  } else {
    Serial.println("Unknown error");
    return p;
  }   
  
  // found a match!
  Serial.print("Found ID #"); Serial.print(finger.fingerID); 
  Serial.print(" with confidence of "); Serial.println(finger.confidence); 
}

// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez() {
  uint8_t p = finger.getImage();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger.image2Tz();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger.fingerFastSearch();
  if (p != FINGERPRINT_OK)  return -1;
  
  // found a match!
  Serial.print("Found ID #"); Serial.print(finger.fingerID); 
  Serial.print(" with confidence of "); Serial.println(finger.confidence);
  digitalWrite(green_led_pin, 1);
  digitalWrite(red_led_pin, 0);
  delay(6000);
  digitalWrite(green_led_pin, 0);
  digitalWrite(red_led_pin, 1);
  return finger.fingerID; 
}

Credits

Arduino “having11” Guy

Arduino “having11” Guy

66 projects • 407 followers
IoT and embedded systems enthusiast. Also an intern at Hackster.io who loves working on projects and sharing knowledge.

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