SIM808 - GSM/GPRS/GPS - HỖ TRỢ 2G/3G/4G - KÈM ĂNG TEN GPS

SIM808 được tích hợp GPS/GSM/GPRS trên cùng 1 module, vì lẽ đó khi chỉ cần sử dụng 1 module này ta có thể : nhắn tin, nghe, gọi, biết được vị trí (GPS) ở đâu...vậy thì quá tuyệt vời, thay vì phải sử dụng 2 module (GSM và GPS) để có cùng chức năng như trên.

TÀI LIỆU KỸ THUẬT:

 + Nguồn cấp: 5 -26VDC

 + Có hỗ trợ chân cấp nguồn pin Lithium - Ion: 3.5 - 4.2V

CODE GIAO TIẾP ARDUINO VỚI SIM808:

/*

*/

#include <SoftwareSerial.h>
#include <TinyGPS++.h>

boolean GetGPS_flag = false;
boolean Location_isValid_flag = false;
boolean Password_flag = false;

String value;
String phone_number;
String message_text;
String password = "Hello";
String Message;

#define PIN_TX    10
#define PIN_RX    11
SoftwareSerial mySerial(PIN_TX, PIN_RX);

// The TinyGPS++ object
TinyGPSPlus gps;

String SIM808(String value) {
  String Out;

  mySerial.println(value);
  delay(10);
  while (mySerial.available()) {
    Out = (mySerial.readString());
  }

  Out.trim();
  Out.remove(0, value.length() + 3);
  return Out;
}
String SIM808(String value, int count) {
  String Out;

  mySerial.println(value);
  delay(10);
  while (mySerial.available()) {
    Out = (mySerial.readString());
  }

  Out.trim();
  Out.remove(0, value.length() + 3 + count);
  return Out;
}

void setup() {
  mySerial.begin(9600);
  Serial.begin(9600);
}

void loop() {
  //******************* RECEIVING SMS *******************
  Serial.println("Start\n");

  Serial.println("Power Down The GPS");
  SIM808("AT+CGPSPWR=0");

  Serial.println("Check AT Connection");
  value = SIM808("AT");
  Serial.println(value);
  Serial.println("");

  Serial.println("Put The Module in SMS Text Mode");
  SIM808("AT+CMGF=1");
  delay(1000);

  Serial.println("Delete All Previous Messages");
  SIM808("AT+CMGD=1,4");
  delay(2000);

  value = SIM808("AT+CMGL=\"REC UNREAD\"");
  value = SIM808("AT+CMGL=\"REC UNREAD\"");
  value = SIM808("AT+CMGL=\"REC UNREAD\"");

  do {
    delay(2000);
    Serial.println("No new Messages Received");
    Serial.println("Check for New Messages!");
    value = SIM808("AT+CMGL=\"REC UNREAD\"");
    //Serial.println("end");
  } while (value == "OK");

  SIM808("AT+CMGL=\"REC UNREAD\"");
  Serial.println("Message Recieved");

  value = SIM808("AT+CMGL=\"ALL\"");
  Serial.println(value);
  phone_number = value;
  phone_number.remove(0, 20);
  phone_number.remove(15, phone_number.length());
  message_text = value;
  message_text.remove(0, 63);
  message_text.remove(message_text.length() - 6, message_text.length());

  Serial.println("Phone Number:");
  Serial.println(phone_number);

  Serial.println("Message Text:");
  Serial.println(message_text);

  if (message_text == password) {
    GetGPS_flag = true;
    Password_flag = true;
    Serial.println("password is correct!");
  }
  //******************* RECEIVING SMS END *******************

  //******************* GET GPS *******************
  if (GetGPS_flag) {
    do {
      Serial.println("Power Down The GPS");
      SIM808("AT+CGPSPWR=0");
      //Serial.println("end");

      Serial.println("Check The GPS Power");
      value = SIM808("AT+CGPSPWR?");
      value.remove(11, 17);
      Serial.println(value);
      //Serial.println("end");

      Serial.println("Power Up The GPS");
      SIM808("AT+CGPSPWR=1");
      //Serial.println("end");

      Serial.println("Disable The GPS Output");
      SIM808("AT+CGPSOUT=0");
      //Serial.println("end\n");

      Serial.println("Wait For The GPS To Find Location");
      while (!SIM808("AT+CGPSSTATUS?" , 13).startsWith("Location 3D Fix")) {
        Serial.println("Location Not Fixed Yet, Please Wait!");
        delay(2000);
      }
      Serial.println("Location Found!");
      Serial.println("end\n");

      //Get and Analyse The GPS Output
      Serial.println("Get and Analyse The GPS Output");
      String Out = "";
      mySerial.println("AT+CGPSOUT=2");

      delay(10);
      while (mySerial.available()) {
        mySerial.readStringUntil('\n');
        mySerial.readStringUntil('\n');
        Out = (mySerial.readStringUntil('\n'));  Out += "\r\n";
      }
      mySerial.println("AT+CGPSOUT=0");
      delay(100);
      mySerial.println("AT+CGPSOUT=32");
      delay(10);
      while (mySerial.available()) {
        mySerial.readStringUntil('\n');
        mySerial.readStringUntil('\n');
        Out += (mySerial.readStringUntil('\n'));  Out += "\r\n";
      }
      mySerial.println("AT+CGPSOUT=0");
      Out.trim();
      Serial.println(Out);
      Serial.println("");
      //GPS Output Analized

      int buffint = Out.length();
      char buff[buffint];
      Out.toCharArray(buff, buffint);
      const char *gpsStream = buff;

      while (*gpsStream)
        if (gps.encode(*gpsStream++))
          displayInfo();

      Serial.println("");
      Serial.println("");

      delay(100);
      if (gps.location.isValid())
      {
        Location_isValid_flag = true;
        Message = String(gps.location.lat(), 6);
        Message += ",";
        Message += String(gps.location.lng(), 6);
        Message += " ";
        Serial.println(Message);
      }
    } while (!Location_isValid_flag);

  }
  //******************* GET GPS END *******************

  //******************* SENDING SMS *******************
  Serial.println("Start Sending The SMS\n");

  Serial.println("Sending The SMS to");
  Serial.println(phone_number);

  SIM808("AT+CMGS=" + phone_number );
  delay(200);

  if (Password_flag == true) {
    mySerial.println("Open This Link:");
    mySerial.print("https://www.google.com/maps/place/");
    SIM808(Message);
  }
  else {
    mySerial.println("Password Incorrect! ");
  }
  Serial.println("Message Sent!");

  Serial.println("Delete All Previous Messages");
  SIM808("AT+CMGD=1,4");
  delay(2000);
  //******************* SENDING SMS END*******************

  //reinitializing flags
  GetGPS_flag = false;
  Location_isValid_flag = false;
  Password_flag = false;
}

void displayInfo()
{
  Serial.print(F("Location: "));
  if (gps.location.isValid())
  {
    Serial.print(gps.location.lat(), 6);
    Serial.print(F(","));
    Serial.print(gps.location.lng(), 6);
  }
  else
  {
    Serial.print(F("INVALID"));
  }

  Serial.println();
}

char * floatToString(char * outstr, double val, byte precision, byte widthp) {
  char temp[16];
  byte i;

  // compute the rounding factor and fractional multiplier
  double roundingFactor = 0.5;
  unsigned long mult = 1;
  for (i = 0; i < precision; i++)
  {
    roundingFactor /= 10.0;
    mult *= 10;
  }

  temp[0] = '\0';
  outstr[0] = '\0';

  if (val < 0.0) {
    strcpy(outstr, "-\0");
    val = -val;
  }

  val += roundingFactor;

  strcat(outstr, itoa(int(val), temp, 10)); //prints the int part
  if ( precision > 0) {
    strcat(outstr, ".\0"); // print the decimal point
    unsigned long frac;
    unsigned long mult = 1;
    byte padding = precision - 1;
    while (precision--)
      mult *= 10;

    if (val >= 0)
      frac = (val - int(val)) * mult;
    else
      frac = (int(val) - val ) * mult;
    unsigned long frac1 = frac;

    while (frac1 /= 10)
      padding--;

    while (padding--)
      strcat(outstr, "0\0");

    strcat(outstr, itoa(frac, temp, 10));
  }

  // generate space padding
  if ((widthp != 0) && (widthp >= strlen(outstr))) {
    byte J = 0;
    J = widthp - strlen(outstr);

    for (i = 0; i < J; i++) {
      temp[i] = ' ';
    }

    temp[i++] = '\0';
    strcat(temp, outstr);
    strcpy(outstr, temp);
  }
  return outstr;
}