R503 Fingerprint Sensor is a device that allows you to read and save up to 200 fingerprints through a touch panel, it also contains a configurable LED light indicator. This sensor is small and easy to use, it has a wide detection range, a nut so you can install it easily and it has 6 pins, 2 for power, 1 for the finger detection signal, another for the touch power and 2 for communication via serial protocol (Tx, Rx) so you can use it with Arduino, ESP 32, PIC and other microcontroller development boards.

R503 Fingerprint Sensor can be used in security, access control and attendance applications, you can use the LED colors to indicate errors in the census, fingerprints found in the records, fingerprints not registered, among other things.

SPECIFICATIONS AND FEATURES

• Model: R503
• Color:
  • Metallic gray
  • Base: White
  • Panel touch: Negro
• Voltage:
  • Input: 3.3V
  • Touch: 3.3 V
  • Typical standby: 3.3V
• Current
  • Operation: 20 mA
  • Standby mode:
  • Average: 2 uA
• Waterproof
• Contains nut for installation
• Image resolution: 508 dpi
• Number of pins: 6
• Connector: SH1.0mm 6pin
• Cable length: 24cm
• Communication protocols: UART (TTL logic level 3.3V)
• Baud rate: (9600 × N) bps; N=1 ~ 12 (default N = 6, i.e. 57600 bps)
• Image acquisition time: <0.2s
• Census shade: 192 x 192 pixels
• Detection area: 15mm diameter
• Weight: 33g
• Dimensions:
  • Top diameter: 27.8mm
  • Base diameter: 25mm
  • Height: 19mm

Pines:

1. VIN: Connection to power supply (3.3 V)
2. GND: Connection to GND of the power supply
3. TXD: Data transmission, TTL logic level
4. RXD: Receive data, TTL logical level
5. WAKE UP: Finger detection signal
6. 3.3VT: Touch induction supply voltage (3-5 V)

DOCUMENTATION AND RESOURCES

• Dimensions
• Adafruit_Fingerprint Bookstore
• Operation manual
• Pinout

ADDITIONAL INFORMATION

How does the R503 Fingerprint Sensor work?

• Fingerprint registration
• Fingerprint reader

When registering, the user must place their finger twice so that the module can process both images and generate a template to save it. In reader mode the system will generate another template and make a comparison with those already saved. The module works with a half-duplex serial protocol, so through a serial monitor you can send commands to change the color of the LED indicator, delete saved fingerprints, choose the record where to save, among others.

Test R503 Sensor Dactyla

In order to test the module, you need to install the library in the Arduino IDE Adafruit_Fingerprint,

We will make the following connections on our Arduino Uno development board:

Cables:

• Red: 3.3V
• Black: GND
• Yellow: Pin 2
• Coffee: Pin 3
• Blue: N/A
• White: 3.3V
  
  
  

Later we will use the following code in our IDE to program our Arduino, this code records and saves the fingerprints detected by the sensor:

#include <Adafruit_Fingerprint.h>

#if (defined(__AVR__) || defined(ESP8266)) && !defined(__AVR_ATmega2560__)
// For Arduino Uno or other devices without serial hardware, we must use serial software...
// pin #2 is sensor input (Yellow Wire) 
// pin #3 is arduino output (Brown Wire)
SoftwareSerial mySerial(2, 3); //Serial port configuration for serial software
#else
// For Leonardo/M0/etc, others with serial hardware, use serial hardware!
// #0 is the yellow wire, #1 is brown
#define mySerial Serial1

#endif

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

uint8_t id;

void setup()

{
Serial.begin(9600);
while (!Serial); // Para Yun/Leo/Micro/Zero/...
delay(100);
Serial.println("nnAdafruit Fingerprint Registro de Huellas");

// Configuring data transmission for the serial port
finger.begin(57600);

// Check connection with the sensor
if (finger.verifyPassword()) {
   Serial.println(" Sensor encontrado!");
} else {
  Serial.println("No se encontró sensor de huellas :(");
  while (1) { delay(1); }
}

// Reading sensor parameters
Serial.println(F("Leyendo parámetros del sensor"));
finger.getParameters();
Serial.print(F("Estatus: 0x")); Serial.println(finger.status_reg, HEX);
Serial.print(F("Sys ID: 0x")); Serial.println(finger.system_id, HEX);
Serial.print(F("Capacidad: ")); Serial.println(finger.capacity);
Serial.print(F("Nivel de Seguridad: ")); Serial.println(finger.security_level);
Serial.print(F("Dirección del Dispositivo: ")); Serial.println(finger.device_addr, HEX);
Serial.print(F("Longitud del paquete: ")); Serial.println(finger.packet_len);
Serial.print(F("Rango de Baudios: ")); Serial.println(finger.baud_rate);
}

uint8_t readnumber(void) {
uint8_t num = 0;

while (num == 0) {
while (! Serial.available());
num = Serial.parseInt();
}
return num;
}

void loop() //Repeat over and over again
{

// Fingerprint registration address choice
Serial.println("Ready to register fingerprint!"< a i=4>);
Serial.println("Please write the ID # (of the 1 to 127) in which you want to register your fingerprint...");
id = readnumber();
if (id == 0) {// ID #0 not allowed, try again!
   return;
}
Serial.print("Registrando ID #");
Serial.println(id);

while (! getFingerprintEnroll() );
}

// Fingerprint registration
uint8_t getFingerprintEnroll() {

int p = -1;
Serial.print("Esperando una huella valida para registrar en #"); Serial.println(id);
while (p != FINGERPRINT_OK) {
  p = finger.getImage();
  switch (p) {
   case FINGERPRINT_OK:
     Serial.println("Imagen obtenida");
   break;
   case FINGERPRINT_NOFINGER:
     Serial.println(".");
   break;
   case FINGERPRINT_PACKETRECIEVEERR:
     Serial.println("Error de comunicación");
   break;
   case FINGERPRINT_IMAGEFAIL:
     Serial.println("Error de Imagen");
   break;
   default:
     Serial.println("Error desconocido");
   break;
  }
}

// OK Success!

p = finger.image2Tz(1);
switch (p) {
 case FINGERPRINT_OK:
   Serial.println("Imagen Convertida");
 break;
 case FINGERPRINT_IMAGEMESS:
   Serial.println("Imagen muy confusa");
 return p;
 case FINGERPRINT_PACKETRECIEVEERR:
   Serial.println("Error de comunicación");
 return p;
 case FINGERPRINT_FEATUREFAIL:
   Serial.println("No se pueden encontrar las caracteristicas de la huella");
 return p;
 case FINGERPRINT_INVALIDIMAGE:
   Serial.println("No se pueden encontrar las caracteristicas de la huella");
 return p;
 default:
   Serial.println("Error desconocido");
 return p;
}

// Get second fingerprint image
Serial.println("Retira el dedo");
delay(2000);
p = 0;
while (p != FINGERPRINT_NOFINGER) {
  p = finger.getImage();
}
Serial.print("ID "); Serial.println(id);
p = -1;
Serial.println("Coloca el mismo dedo otra vez");
while (p != FINGERPRINT_OK) {
  p = finger.getImage();
switch (p) {
 case FINGERPRINT_OK:
   Serial.println("Imagen obtenida");
 break;
 case FINGERPRINT_NOFINGER:
   Serial.print(".");
 break;
 case FINGERPRINT_PACKETRECIEVEERR:
   Serial.println("Error de comunicación");
 break;
 case FINGERPRINT_IMAGEFAIL:
   Serial.println("Error de imagen");
 break;
 default:
   Serial.println("Error desconocido");
 break;
}
}

// OK Success!

p = finger.image2Tz(2);
switch (p) {
 case FINGERPRINT_OK:
   Serial.println("Imagen convertida");
 break;
 case FINGERPRINT_IMAGEMESS:
   Serial.println("Imagen muy confusa");
 return p;
 case FINGERPRINT_PACKETRECIEVEERR:
   Serial.println("Error de comunicación");
 return p;
case FINGERPRINT_FEATUREFAIL:
   Serial.println("No se pueden encontrar las características de la huella");
return p;
case FINGERPRINT_INVALIDIMAGE:
  Serial.println("No se pueden encontrar las características de la huella");
return p;
default:
  Serial.println("Error desconocido");
return p;
}

// OK converted!
Serial.print("Creando el modelo para #"); Serial.println(id);

p = finger.createModel();
if (p == FINGERPRINT_OK) {
  Serial.println("Han coincidido las huellas!");
} else if (p == FINGERPRINT_PACKETRECIEVEERR) {
  Serial.println("Error de comunicación");
  return p;
} else if (p == FINGERPRINT_ENROLLMISMATCH) {
  Serial.println("Las huellas no coinciden");
  return p;
} else {
  Serial.println("Error desconocido");
  return p;
}

Serial.print("ID "); Serial.println(id);
p = finger.storeModel(id);
if (p == FINGERPRINT_OK) {
  Serial.println("Guardado!");
} else if (p == FINGERPRINT_PACKETRECIEVEERR) {
  Serial.println("Error de comunicación");
  return p;
} else if (p == FINGERPRINT_BADLOCATION) {
  Serial.println("No se puede guardar en esa ubicación");
  return p;
} else if (p == FINGERPRINT_FLASHERR) {
  Serial.println("Error de escritura en la memoria flash");
  return p;
} else {
  Serial.println("Error desconocido");
  return p;
}

return true;
}

Remember that in order to view the operation of the code you must open the serial monitor:

If you require more examples of use, for example to detect if the fingerprints are already saved, configure the LED indicator or delete fingerprint records, you can access the examples that the library has from here or from the Arduino IDE:

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