Usage of two Fingerprint Sensor at the same time (ESP32)

[chicaovital]

Hi All,
Quite new on this amazing world, so really appreciate if you can help.

I´m trying to connect two Fingerprint Sensor (R503) in just one ESP32-S.

The program below (based on Adafruit) is only checking the Serial1.

Could you give some light here?

Obs: The Serial port 1 & 2 are correct and the program can read both sensors.

Thanks

//========
#include <Adafruit_Fingerprint.h>

Adafruit_Fingerprint finger1 = Adafruit_Fingerprint(&Serial1); //Sensor Portao da rua
Adafruit_Fingerprint finger2 = Adafruit_Fingerprint(&Serial2); //Sensor Porta da Sala
 

void setup(){

 Serial.begin(9600);
 Serial1.begin(9600, SERIAL_8N1, 5,18); //Comunicacao com Portao
 Serial2.begin(9600, SERIAL_8N2, 16,17); //Comunicacao com Porta

 finger1.begin(57600);
 delay(5);
 finger2.begin(57600);
 delay(5);

 

  if (finger1.verifyPassword()) {
    Serial.println("Sensor de Digital do Portao encontrado!");
    } else {
      Serial.println("Sensor de Digital do Portao NAO encontrado!");
      while (1) { delay(1); }
  }

  if (finger2.verifyPassword()) {
    Serial.println("Sensor de Digital da Porta encontrado!");
    } else {
      Serial.println("Sensor de Digital da Porta NAO encontrado!");
      while (1) { delay(1); }
  }
 
 
 
  Serial.println(F("Parametreos do Sensor de Digital do Portao"));
  finger1.getTemplateCount();
  finger1.getParameters();
  Serial.print(F("Status: 0x")); Serial.println(finger1.status_reg, HEX);
  Serial.print(F("Sys ID: 0x")); Serial.println(finger1.system_id, HEX);
  Serial.print(F("Capacity: ")); Serial.println(finger1.capacity);
  Serial.print(F("Security level: ")); Serial.println(finger1.security_level);
  Serial.print(F("Device address: ")); Serial.println(finger1.device_addr, HEX);
  Serial.print(F("Packet len: ")); Serial.println(finger1.packet_len);
  Serial.print(F("Baud rate: ")); Serial.println(finger1.baud_rate);
  Serial.print("Sensor contains "); Serial.print(finger1.templateCount);
  Serial.println(" templates");
  delay(1000);

  Serial.println(F("Parametreos do Sensor de Digital da Porta"));
  finger2.getTemplateCount();
  finger2.getParameters();
  Serial.print(F("Status: 0x")); Serial.println(finger2.status_reg, HEX);
  Serial.print(F("Sys ID: 0x")); Serial.println(finger2.system_id, HEX);
  Serial.print(F("Capacity: ")); Serial.println(finger2.capacity);
  Serial.print(F("Security level: ")); Serial.println(finger2.security_level);
  Serial.print(F("Device address: ")); Serial.println(finger2.device_addr, HEX);
  Serial.print(F("Packet len: ")); Serial.println(finger2.packet_len);
  Serial.print(F("Baud rate: ")); Serial.println(finger2.baud_rate);
  Serial.print("Sensor contains "); Serial.print(finger2.templateCount);
  Serial.println(" templates");
  delay(1000);
 
}

 

void loop() { 


 getFingerprintID1(); 
 delay(50);

 getFingerprintID2();
 delay(50);
 



}

//=============GET FINGERPRINT SERIAL-1 PORTAO==============================  
uint8_t getFingerprintID1() {
  uint8_t p = finger1.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 = finger1.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 = finger1.fingerSearch();
  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(finger1.fingerID);
  Serial.print(" with confidence of "); Serial.println(finger1.confidence);

  return finger1.fingerID;
}

// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez1() {
  uint8_t p = finger1.getImage();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger1.image2Tz();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger1.fingerFastSearch();
  if (p != FINGERPRINT_OK)  return -1;

  // found a match!
  Serial.print("Found ID #"); Serial.print(finger1.fingerID);
  Serial.print(" with confidence of "); Serial.println(finger1.confidence);
  return finger1.fingerID;
}
 




//================GET FINGERPRINT SERIAL-2 PORTA DA SALALA==============================  
uint8_t getFingerprintID2() {
  uint8_t p = finger2.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 = finger2.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 = finger2.fingerSearch();
  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(finger2.fingerID);
  Serial.print(" with confidence of "); Serial.println(finger2.confidence);

  return finger2.fingerID;

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[gilshultz]

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[StefanL38]

Hi @chicaovital

welcome to the arduino-forum

Re-edit your first posting to present your code as a code-section
use the <.code.>-button above the posting-edit-field

best regards Stefan

[mrburnette]

@chicaovital

I´m trying to connect two Fingerprint Sensor (R503) in just one ESP32-S.

ESP32 VS ESP32S2 just for completeness

Caveat: I do not own this sensor, so my comments may be completely valueless to your case.

Using 2 sensors was never the intent of the Adafruit library for this product. The library provides for multiple fingerprint enrollment:

Connect to any microcontroller or system with TTL serial, and send packets of data to take photos, detect prints, hash and search. You can also enroll new fingers directly - up to 162 finger prints can be stored in the onboard FLASH memory.
Reference above: GitHub - adafruit/Adafruit-Fingerprint-Sensor-Library: Arduino library for interfacing to the fingerprint sensor in the Adafruit shop

Manufactures Reference Circuit:

Without digging into Adafruit's library, the issue may be that the library does not support multi-instances. Definitely something you can address on the Adafruit support forum. (Flash access in multiple simple libraries may have conflicts.)

Outside of a missile silo with dual human "keys" or a safe requiring two humans to unlock, your use scenario eludes me

[chicaovital]

Thanks all.
Problem solved based on the comments.

The issue was that i was feeding the sensor 2 with the wrong voltage. The correct is 3.3V.
Once fixed it, the program is running perfect.
Thanks