Description

Time clock with fingerprint IoT module, uploading data to thingspeak

More info in and updates in https://rogerbit.com/wprb/2022/07/reloj-de-control-fingerprint/

In this tutorial we will see how to create a personal control reader/clock with esp32, a fingerprint reader sensor. All the data will be uploaded to the cloud, through the services of thingspeak.com. The assembly of the electronic circuit, the detailed explanation of the source code and finally, the device will be tested will be included.

Electronic components

An Esp32

Features of the ESP32-T module

Connectivity

The ESP32 module has all the WiFi variants :

802.11 b/g/n/e/i/n

Wi-Fi Direct (P2P), P2P Discovery, P2P Group Owner mode and P2P Power Management

This new version includes connectivity via low-consumption Bluetooth

Bluetooth v4.2 BR/EDR and BLE

BLE Beacon

In addition, it can communicate using SPI, I2C, UART, MAC Ethernet, Host SD protocols

Microcontroller Features

The CPU is made up of a Tensilica LX6 model SoC with the following features and memory

Dual core 32-bit with 160MHz speed

448 kBytes ROM memory

520kBytes SRAM memory

48 Pin Dispne

18 12-bit ADCs

2 8-bit DACs

10 pin contact sensors

16 PWM

20 Digital inputs/outputs

Food and consumption patterns

For the correct operation of the ESP32, it is necessary to supply a voltage between 2.8V and 3.6V. The energy it consumes depends on the operating mode. It contains a mode, the Ultra Low Power Solution (ULP) , in which basic tasks (ADC, RTC...) continue to be performed in Sleep mode.

Open Smart fingerprint module

Download Manual –> R308-fingerprint-module-user-manual_English

Buzzer

Female pins

Male pins

PCB

Download gerber file –> https://rogerbit.com/wprb/wp-content/uploads/2022/07/Esp32_fingerprint_PCB.zip

Code

Source code

C/C++

// Importar bibliotecas necesarias
#include <WiFi.h>
#include <HTTPClient.h>
#include <Adafruit_Fingerprint.h>
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&Serial2);
uint8_t id;
int pin27 = 27;
const int led = 2;//Led onboard del esp32
String numID;
int codigo;
// Establezca su nombre y contraseña de wifi
const char* ssid = "Tu_red_wifi";
const char* password = "Tu_clave_wifi";
// La URL de tu canal de thingspeak con el número de api_key
String nombreServidor = "https://api.thingspeak.com/update?api_key=Tu_Api_Key";
void setup()  
{
  while (!Serial);  // Para Yun/Leo/Micro/Zero/...
  Serial.begin(9600);//Velocidad del puerto serie arduino
  pinMode(pin27, OUTPUT);//Buzzer
  pinMode(led, OUTPUT);//Led onboard del esp32
  WiFi.begin(ssid, password); // Intenta conectarte a wifi con nuestra contraseña
  Serial.println("Conectando"); // Imprime nuestro estado en el monitor de serie
  // Espera a que se conecte el wifi
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Conectado a la red WiFi con la dirección IP: ");
  Serial.println(WiFi.localIP());
 //Dos bip indican que se conectó el dispositivo a la red wifi
  bip(100);
  delay(400);
  bip(100);
  Serial.println("Inicio detección del módulo fingerprint");
  // Velocidad de transmisión de datos entre el arduino y el módulo fingerprint
  finger.begin(57600);
  
  if (finger.verifyPassword()) {
    Serial.println("¡Sensor de huellas dactilares conectado ok!");
  } else {
    Serial.println("Revisa la conexión del sensor de huellas :(");
    while (1);
  }
  Serial.println("Esperando una huella válida...");
}

void loop()     
{
  datosFingerprint();
  delay(50); //Pequeño delay
}
// Devuelve -1 si falla, de lo contrario devuelve ID #
int datosFingerprint() {
  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;

//Encontrado una coincidencia!
  Serial.print("Huella ID #"); Serial.print(finger.fingerID); 
  Serial.print(" con una confianza de "); Serial.println(finger.confidence);
//Activar el buzzer durante 100 mili segundos
bip(100);
delay(100);
numID = String(finger.fingerID); //Convierte el id en cadena para ser compatible con el display

Serial.print("Huella Correcta # ");
Serial.println(numID);
digitalWrite(led, HIGH);
////---------------------
if(WiFi.status()== WL_CONNECTED){ // Comprueba que la wifi todavía esté conectada
HTTPClient http; // Inicializar nuestro cliente HTTP
  String url = nombreServidor + "&field1=" + numID ; // Definir nuestra URL completa    
  http.begin(url.c_str()); // Inicializa nuestra solicitud HTTP     
  int codigoRespuestaHTTP = http.GET(); // Enviar solicitud HTTP   
  if (codigoRespuestaHTTP > 0){ // Verifica que haya código de estado HTTP correcto
    Serial.print("Codigo de respuesta HTTP: ");
    Serial.println(codigoRespuestaHTTP);
    codigo = codigoRespuestaHTTP;
  }else{
    Serial.print("Codigo de error: ");
    Serial.println(codigoRespuestaHTTP);
//Reintentamos una vez más por si hubo un error en la comunicación
    http.begin(url.c_str()); // Inicializa nuestra solicitud HTTP      
  int codigoRespuestaHTTP = http.GET(); // Enviar solicitud HTTP     
  if (codigoRespuestaHTTP > 0){ // Verifica que haya código de estado HTTP correcto
    Serial.print("Codigo de respuesta HTTP: ");
    Serial.println(codigoRespuestaHTTP);
  }
  }
  http.end();   
    }
    else {
      Serial.println("WiFi desconectado");
    }
numID="";
delay(10000);
//Bip largo sibió datos a thingspeak
if(codigo == 200){
digitalWrite(led, LOW);
bip(750);
}
//Tres bip hubo un problema al subir los datos a thingpeag
if(codigo != 200){
bip(150);
delay(150);
digitalWrite(led, LOW);
bip(150);
delay(150);
digitalWrite(led, HIGH);
bip(150);
delay(150);
digitalWrite(led, LOW);
}
}
//Sonido del buzzer
void bip(int demora){
digitalWrite(pin27, HIGH);
delay(demora);
digitalWrite(pin27, LOW);  
  }

Aug 14,2024

136 views

Time clock with fingerprint IoT module, uploading data to thingspeak

In this tutorial we will see how to create a personal control reader/clock with esp32, a fingerprint reader sensor.

136

Published: Aug 14,2024

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