Arduino - Uso de redes WiFi y GSM/GPRS

#include <WiFi.h>

#include <SoftwareSerial.h>                            // Librería Software Serial para utilizar otros pines como conexión serial

#include <OneWire.h>

#include <DallasTemperature.h>

const char* ssid     = "xxxxx";      // SSID

const char* password = "xxxxx";      // Password

const char* host = "192.168.1.x";  // Dirección IP local o remota, del Servidor Web

const int   port = 80;            // Puerto, HTTP es 80 por defecto, cambiar si es necesario.

const int   watchdog = 2000;        // Frecuencia del Watchdog

unsigned long previousMillis = millis();

String dato;

String cade;

String line;

int ID_TARJ=1;

// GPIO where the DS18B20 is connected to

const int oneWireBus = 4;

// Setup a oneWire instance to communicate with any OneWire devices

OneWire oneWire(oneWireBus);

// Pass our oneWire reference to Dallas Temperature sensor

DallasTemperature sensors(&oneWire);

void setup() {

  Serial.begin(115200);

  Serial.print("Conectando a...");

  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("");

  Serial.println("WiFi conectado");

  Serial.println("Dirección IP: ");

  Serial.println(WiFi.localIP());

  // Start the DS18B20 sensor

  sensors.begin();

}

void loop() {

  unsigned long currentMillis = millis();

  // Reading temperature or humidity takes about 250 milliseconds!

  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

  sensors.requestTemperatures();

  float temperatureC = sensors.getTempCByIndex(0);

  Serial.print(temperatureC);

  Serial.println("ºC");

  delay(2000);

  if ( currentMillis - previousMillis > watchdog ) {

    previousMillis = currentMillis;

    WiFiClient client;

    if (!client.connect(host, port)) {

      Serial.println("Conexión falló...");

      return;

    }

    String url = "/temperatura/proceso_eventos/programa1.php?temperatura=";

    url += temperatureC;

    url += "&ID_TARJ=";

    url += ID_TARJ;

    // Envío de la solicitud al Servidor

    client.print(String("POST ") + url + " HTTP/1.1\r\n" +

               "Host: " + host + "\r\n" +

               "Connection: close\r\n\r\n");

    unsigned long timeout = millis();

    while (client.available() == 0) {

      if (millis() - timeout > 5000) {

        Serial.println(">>> Superado tiempo de espera!");

        client.stop();

        return;

      }

    }

    // Lee respuesta del servidor

    while(client.available()){

      line = client.readStringUntil('\r');

      Serial.print(line);

    }

      Serial.print("Dato ENVIADO");

      delay(4000);

  }

}

// This program collects data (battery voltage) once per hour and reports it to a URL on the internet.

// To eliminate unecessary data usage, the data is reported using a HEAD method.

// Uses a SIM800L to connect to the GPRS network.

#include <SoftwareSerial.h>

#define GSM_TX 3

#define GSM_RX 4

#define GSM_RESET 2

#define BATTERY A3

#define STATUS 13

// Set the GPRS Access Point Name (APN) to suit your SIM card.

#define AccessPointName "hologram"

// Set the address of the server where the measurements should be reported.

#define HTTPserver "http://xyz.000webhostapp.com"

// Set the URL of the program that receives the measurements.

#define HTTPurl "/newdata.php?"

SoftwareSerial GSM_serial(GSM_RX, GSM_TX);

// Note that only GSM_TX is used. GSM_RX is not used.

void connect()

{

  GSM_serial.print("+++");

  delay(1000);

  GSM_serial.print("AT\r\n");

  delay(1000);

  GSM_serial.print("ATE1\r\n"); // Turn on echo, makes it easier to debug the SIM800L

  delay(1000);

  GSM_serial.print("AT+CGATT=1\r\n");

  delay(1000);

  GSM_serial.print("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"\r\n");

  delay(1000);

  GSM_serial.print("AT+SAPBR=3,1,\"APN\",\"");

  GSM_serial.print(AccessPointName);

  GSM_serial.print("\"\r\n");

  delay(1000);

  GSM_serial.print("AT+SAPBR=1,1\r\n");

  delay(3000);

}

void disconnect()

{

  GSM_serial.print("AT+SAPBR=0,1\r\n");

}

void HTTPhead(char *message)

{

  digitalWrite(STATUS, 1);

  connect();

  GSM_serial.print("AT+HTTPINIT\r\n");

  delay(1000);

  GSM_serial.print("AT+HTTPPARA=\"CID\",1\r\n");

  delay(1000);

  GSM_serial.print("AT+HTTPPARA=\"URL\",\"");

  GSM_serial.print(HTTPserver);

  GSM_serial.print(HTTPurl);

  GSM_serial.print(message);

  GSM_serial.print("\"\r\n");

  delay(1000);

  GSM_serial.print("AT+HTTPACTION=2\r\n"); // Request header only, reduces data usage

  delay(3000);

  GSM_serial.print("AT+HTTPTERM\r\n");

  disconnect();

  digitalWrite(STATUS, 0);

  delay(45000);  // To make function last 1 minute

}

void reset_GSM()

{

  digitalWrite(STATUS, 1);

  digitalWrite(GSM_RESET, 0);

  delay(100);

  digitalWrite(GSM_RESET, 1);

  digitalWrite(STATUS, 0);

  delay(59000);  // To make function last 1 minute

}

void low_power_GSM()

{

  GSM_serial.print("AT+CFUN=0,1\r\n");

  delay(60000);  // To make function last 1 minute

}

void full_power_GSM()

{

  GSM_serial.print("AT+CFUN=1,1\r\n");

  delay(60000);  // To make function last 1 minute

}

float battery_voltage() // Read the battery voltage

{

  float voltage = 0;

  for (int i=0; i<30; i++)

  {

    int batteryValue = analogRead(BATTERY);

    voltage += batteryValue * (16.128 / 1023.0); // This formula must be adjusted to suit the Vcc voltage

    delay(2000);                                 // and the avlues of the resistors used for measurement

  }                                              // Should be 16.0/1023.0 for Vcc=4v and perfectly equal resistors.

  return voltage/30; // To smooth out any noise, 30 samples are taken and the average is returned.

}

void setup()

{

  Serial.begin(9600);

  Serial.println("Reset");

  pinMode(GSM_RESET, OUTPUT);

  digitalWrite(GSM_RESET, 1);

  pinMode(STATUS, OUTPUT);

  digitalWrite(STATUS, 0);

  GSM_serial.begin(9600);

  reset_GSM();

}

void delay_minute()

{

  for (int i=0; i<60; i++) delay(1000);

}

void loop()  // Battery voltage measurement is reported once per hour.

{

  char buf[20];

  float bv = battery_voltage();            // Read battery voltage and convert to string "voltage=nn.n"

  dtostrf(bv, 3, 1, buf);

  String message = String("voltage=");

  message +=buf;

  full_power_GSM();                        // Move to full power mode to get ready to send data.

  message.toCharArray(buf, 20);            // Prepare message.

  HTTPhead(buf);                           // Report measurement by sending HEAD message to internet URL.

  reset_GSM();                             // Reset SIM800L to prevent unwanted data usage.

  low_power_GSM();                         // SIM800L uses a lot of power if it is left if full power mode.

  for (int i=0; i<55; i++) delay_minute(); // Wait an hour until the next report.

}