// Include library for 1-Wire communication protocol
#include <OneWire.h>
// Include library to communicate easily with the sensors
#include <DallasTemperature.h>

// Define the pin Arduino will use with the 1-Wire protocol
#define ONE_WIRE_BUS 8

// Create a "oneWire" class to work with the chosen pin
OneWire oneWire(ONE_WIRE_BUS);

// Pass the data from the 1-Wire protocol to the Dallas library
DallasTemperature sensors(&oneWire);

// Static Variables
int sensorHumidity = A0;    // Declare the humidity sensor pin variable
int pinModuleOn = 2;        // Declare the pin variable to activate GPRS module
char phone_number[]="*********";  // the phone number to which the message is sent

// Dynamic Variables
int valueHumidity = 0;      // Variable for the humidity value
float valueTemperature = 0; // Variable for the temperature value

void activateModule(){      // Function in charge of activating the GPRS module
  digitalWrite(pinModuleOn,HIGH);
  delay(2000);
  digitalWrite(pinModuleOn,LOW);
}

void setup() {
  // Initialize the serial port
  Serial.begin(115200);
  // Short time delay
  delay(2000);
  // Initialize the triggering pin from the module as it exits
  pinMode(pinModuleOn, OUTPUT);
  // Turn on the GPRS module
  activateModule();
  // Wait a moment for the module to initialize
    for (int i=0;i < 5;i++){
        delay(20000);
    }
  // Initialize the 1-Wire protocol and the sensor
  sensors.begin();
}

void loop() {
  // Query the temperature on the device
  sensors.requestTemperatures();
  // Store the temperature value
  valueTemperature = sensors.getTempCByIndex(0);
  // Read the analog value of the sensor and store it
  valueHumidity = analogRead(sensorHumidity);
  // Check that the measurements are within sane ranges
  if ( (valueHumidity<400) || (valueTemperature<24)) {
    // The missed call is made when the measurements are dangerous for the plant
    Serial.print("ATD");
    Serial.print(phone_number);
    Serial.println(";");
    // Missed call
    delay(20000);
    // Finalize the missed call
    Serial.println("ATH");
    delay(10000);
  }
}