SIM808 GPRS/GSM+GPS Shield v1.1

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Contents

Introduction

SIM808 module is a GSM/GPS/BT three-in-one function module. It is based on the latest GSM/GPS/BT module SIM808 from SIMCOM, supports GSM/GPRS Quad-Band network and combines GPS technology for satellite navigation.It has high GPS receive sensitivity with 22 tracking and 66 acquisition receiver channels. Besides, it supports A-GPS that available for indoor localization, and it also supports for Bluetooth 4.0.

The module is controlled by AT command via UART and supports 3.3V and 5V logical level.

Model: ACS80801S
GPRS+GSM+GPS Shield.jpg

Features

  • Quad-band 850/900/1800/1900MHz.
  • GPRS multi-slot class12 connectivity: max. 85.6kbps(down-load/up-load).
  • GPRS mobile station class B.
  • Controlled by AT Command (3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands).
  • Supports Real Time Clock.
  • Supply voltage range 5V ~ 12V.
  • Supports for Bluetooth 4.0.
  • Integrated GPS/CNSS and supports A-GPS.
  • Supports 3.0V to 5.0V logic level.
  • Low power consumption, 1mA in sleep mode.
  • Supports GPS NMEA protocol.
  • Standard Micro SIM Card.

Application Ideas

  • M2M (Machine 2 Machine) Applicatoions - To transfer control data using SMS or GPRS between two machines located at two different factories.
  • Remote control of appliances - Send SMS while you are at your office to turn on or off your washing machine at home.
  • Remote Weather station or a Wireless Sensor Network - Make it with [Crowduino v1.0|Crowduino v1.0] and create a sensor node capable of transferring sensor data (like from a weather station - temperature, humidity etc.) to a web server (like pachube.com).
  • Vehicle Tracking System - Install GPRS+GSM+GPS Shield in your car and publish your location live on the internet. Can be used as a automotive burglar alarm.

Cautions

  • Make sure your SIM card is unlocked.
  • The product is provided as is without an insulating enclosure. Please observe ESD precautions specially in dry (low humidity) weather.
  • The factory default setting for the GPRS Shield UART is autobaoding. It supports baud rate from 1200 bps to 115200bps. (Can be changed using AT commands).

Specifications

Item Min Typical Max Unit
Voltage 4.8 5.0 12 VDC
Current 2 - 500 mA
Dimension(with antenna) Arduino shield mm
Net Weight 47±2 g

Interface Function

GPRS+GSM+GPS Shield interface.jpg
Power supply - Vin connected to external 5~9VDC power supply
Antenna interface - connected to external antenna
Serial port select - select either software serial port or hareware serial port to be connected to GPRS+GSM+GPS Shield Shield
Hardware Serial - D0/D1 of Arduino/Crowduino
Software serial - D7/D8 of Arduino/Crowduino
Status LED - tell whether the power of SIM808 is on
Net light - tell the status about SIM808 linking to the net
1PPS - tell the status about SIM808 get the location
UART of SIM808 - UART pins breakout of SIM808
Microphone - to answer the phone call
Speaker - to answer the phone call
GPIO,PWM and ADC of SIM808 - GPIO,PWM and ADC pins breakout of SIM808
Power key - power up and down for SIM808

Pins usage on Arduino

D0 - Unused if you select hardware serial port to communicate with GPRS+GSM+GPS Shield
D1 - Unused if you select hardware serial port to communicate with GPRS+GSM+GPS Shield
D2 - Unused
D3 - Unused
D4 - Unused
D5 - Unused
D6 - Unused
D7 - Used if you select software serial port to communicate with GPRS+GSM+GPS Shield
D8 - Used if you select software serial port to communicate with GPRS+GSM+GPS Shield
D9 - Used for software control the power up or down of the SIM808
D10 - Unused
D11 - Unused
D12 - Unused
D13 - Unused
D14(A0) - Unused
D15(A1) - Unused
D16(A2) - Unused
D17(A3) - Unused
D18(A4) - Unused
D19(A5) - Unused

Usage

Hardware installation

1.Insert an Micro SIM card to SIM Card Holder

6 Pin Holder for SIM Cards. Both 1.8 volts and 3.0 volts SIM Cards are supported by SIM808 - the SIM card voltage type is automatically detected.
Inserting the SIM Card into the holder4.jpg Inserting the SIM Card into the holder3.jpg

2.Connect the Antenna

A miniature coaxial RF connector is present on the SIM808 GPRS/GSM+GPS Shield board to connect with a GSM Antenna. The connector present on the SIM808 GPRS/GSM+GPS Shield is called a U.FL connecto.The GSM Antenna supplied with the GPRS Shield has an SMA connector (and not an RP-SMA connector) on it.The connection topology is shown in the diagram below:
GPRS+GSM+GPS Shield antenna pad2.jpg GPRS+GSM+GPS Shield antenna pad3.jpg

3.Plug to Arduino/Crowduino

The GPRS+GSM+GPS Shield, like any other well designed shield, is stackable as shown in the photo below.
Plug SIM808 GPRS GSM+GPS to arduino.jpg

Turn on the SIM808 GPRS/GSM+GPS shield

There is two ways to turn on the SIM808 GPRS/GSM+GPS Shield.
1. Turn on through Hardware. Press the the 'POWERKEY' for few seconds until Power-on indicator(Green) is on.
POWERONkey
2. Turn on through Software. If the JP is soldered,run the following code, the SIM808 will POWER on or POWER off.

int Powerkey = 9;
void setup() {                
  pinMode(Powerkey, OUTPUT);   // initialize the digital pin as an output.  
  power();                     //power on the sim808 or power down the sim808
}
void loop() 
{

}

void power(void)
{
  digitalWrite(Powerkey, LOW); 
  delay(1000);               // wait for 1 second
  digitalWrite(Powerkey, HIGH);
}

Serial Port(UART) Communication

The SIM808 GPRS/GSM+GPS Shield is used UART protocol to communicate with an Arduino/Arduino clone; Users can use jumpers to connect (RX,TX) of the shield to either Software Serial(D8,D7) or Hardware Serial(D1,D0) of the Arduino.Detailed information is showed as the following picture:

Coms1.jpg
Selectalbe GPRS+GSM+GPS Shield Communication Port

Power Down the GPRS Shield

The GPRS Shield can be turned off by following ways:

  • 1, Normal power down procedure: Turn off the GPRS shield by using Hardware Triger; Press the ON/OFF Button about one seconds.

magic mesh The power down scenarios illustrates as following figure:

ONd.jpg
Figure of Timing of turning off GPRS Shield using Hardware Triger
  • 2, Normal power down procedure: If JP is soldered, then give Digital Pin 9 of the Arduino(act as Software Triger) a Turn off Impulse can turn off the GPRS Shield. The power down scenarios illustrates as following figure:
Pwrd.jpg
Figure of Timing of turning off GPRS Shield using Software Triger

The following code is power down subroutine for Arduino if using software triger:

int Powerkey = 9;
void setup() {                
  pinMode(Powerkey, OUTPUT);   // initialize the digital pin as an output.  
  power();                     //power on the sim808 or power down the sim808
}
void loop() 
{

}

void power(void)
{
  digitalWrite(Powerkey, LOW); 
  delay(1000);               // wait for 1 second
  digitalWrite(Powerkey, HIGH);
}


  • 3, Normal power down procedure: Turn off the GPRS shield by sending AT command "AT+CPOWD=1" to SIM808 module.

When GPRS Shield power dowm in Normal power down procedure, the procedure lets the SIM808 log off from the network and allows the software to enter into a secure state and save data before completely disconnecting the power supply. Before the completion of the power down procedure the SIM808 will send out result code:

NORMAL POWER DOWN

  • 4, Over-voltage or Under-voltage Power Down: The module software monitors VBAT voltage constantly.

①If the voltage ≤ 3.5V, the following URC will be reported:

UNDER-VOLTAGE WARNNING

②If the voltage ≥ 4.3V, the following URC will be reported:

OVER-VOLTAGE WARNNING

③If the voltage < 3.4V, the following URC will be reported,and the module will be automativally powered down.

UNDER-VOLTAGE POWER DOWN

④If the voltage > 4.4V, the following URC will be reported,and the module will be automativally powered down.

OVER-VOLTAGE POWER DOWN

  • 5, Over-temperature or Under-temperature Power Down: SIM900 will constantly monitor the temperature of the module.

①If the temperature > +80℃, the following URC will be reported:

+CMTE:1

②If the temperature < -30℃, the following URC will be reported:

+CMTE:-1

③If the temperature > +85℃, the following URC will be reported,and the module will be automativally powered down.

+CMTE:2

④If the temperature < -40℃, the following URC will be reported,and the module will be automativally powered down.

+CMTE:-2

When the GPRS Shield encounters POWER DOWN scenario, the AT commands can not be executed. The SIM808 logs off from network and enters the POWER DOWN mode, only the RTC is still active. POWER DOWN can also be indicated by STATUS LED(Blue), which is off in this mode.

Note:

  • To monitor the temperature, users can use the “AT+CMTE” command to read the temperature when GPRS Shield is powered on.

Upload Sketch to Arduino

Grpsaurduinouart1.jpg
Data Stream among Computer, Arduino and GPRS Shield

The following sketch configures Arduino/Arduino clone as serial link between PC and the GPRS Shield(Jumpers on SWserial side). PC would need a serial terminal software to communicate with it - Window's built-in HyperTerminal, Arduino IDE's Serial Monitor, Serial Terminals(sscom32) or Bray++ Terminal.

After uploading the sketch to the Arduino board, press the ON/OFF button on the GPRS Shield to turn it on; Now you can see what you get on the serial terminal and the status of the three indicator LEDs, then communicate with your Shield.

//Serial Relay - Arduino will patch a 
//serial link between the computer and the GPRS Shield
//at 19200 bps 8-N-1
//Computer is connected to Hardware UART
//GPRS Shield is connected to the Software UART 

#include <SoftwareSerial.h>

SoftwareSerial GSMSerial(7, 8);

void setup()
{
GSMSerial.begin(19200);               // the GPRS/GSM baud rate   
Serial.begin(19200);                 // the GPRS/GSM baud rate   
}

void loop()
{
if(Serial.available())

GSMSerial.print((char)Serial.read());

else  if(GSMSerial.available())

Serial.print((char)GSMSerial.read());
}

SIM808 gprs gsm shield AT.jpg
Note:

  • The "AT" or "at" prefix must be set at the beginning of each Command line. To terminate a Command line enter <CR>.


Set Baud and Enable Charging Function

It is recommended to execute this process when first time to use the module. In the Serial Monitor columns of following tables, input of AT commands are in back, module returns values are in orange.

Serial Monitor Description
AT
OK
Send command “AT” to synchronize baud rate. Serial port of module is by default set at auto-baud mode, and in this mode, it will not output any indications when the module is on.
AT+IPR=9600
OK
Set baud rate at 9600bps, supports baud rate from 1200bps to 115200bps.
AT+ECHARGE=1
OK
Send command “AT+ECHARGE=1” to enable battery charging function. By default the charging function is closed.
AT&W
OK
Save parameter setting.
AT+CPOWD=1
NORMAL POWER DOWN
Power down the module.
RDY
+CFUN: 1
GPS Ready
+CPIN: READY
Call Ready
SMS Ready
Turn on the module again by the power button, it will response status about GPS and GSM.
AT+CBC
+CBC: 1,96,4175
OK
Inquire charging status and remaining battery capacity.
AT+CSQ
+CSQ: 14,0
OK
Inquire GSM signal quality.

GNSS AT Command

AT Command Description
AT+CGNSPWR GNSS power conntrol
AT+CGNSSEQ Define the last NMEA sentence that paresed
AT+CGNSINF GNSS navigation information parsed from NMEA sentences
AT+CGNSURC GNSS navigation, GEO-fences and speed alarm URC report
AT+CGNSCMD Send command to GNSS
AT+CGNSTST Send data received from GNSS to AT UART

More information you can refer the SIM800 Series_GNSS_Application Note V1.00.

Examples

Sending SMS: using Software UART


#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8);

void setup()
{
mySerial.begin(19200);  //Default serial port setting for the GPRS modem is 19200bps 8-N-1
mySerial.print("\r");
delay(1000);                    //Wait for a second while the modem sends an "OK"
mySerial.print("AT+CMGF=1\r");    //Because we want to send the SMS in text mode
delay(1000);

//mySerial.print("AT+CSCA=\"+919032055002\"\r");  //Setting for the SMS Message center number,  
//delay(1000);                                  //uncomment only if required and replace with
//the message center number obtained from
//your GSM service provider.
//Note that when specifying a tring of characters
// " is entered as \"

mySerial.print("AT+CMGS=\"+9184460xxxx\"\r");    //Start accepting the text for the message
//to be sent to the number specified.
//Replace this number with the target mobile number.
delay(1000);
mySerial.print("Hello,Elecrow!\r");   //The text for the message
delay(1000);
mySerial.write(0x1A);  //Equivalent to sending Ctrl+Z 
}

void loop()
{
//We just want to send the SMS only once, so there is nothing in this loop.
//If we put the code for SMS here, it will be sent again and again and cost us a lot.
}

Making a call: using Software UART


#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8);

void setup()
{
mySerial.begin(19200);               // the GPRS baud rate   
Serial.begin(19200);               // the GPRS baud rate   
delay(2000);
mySerial.println("ATDxxxxxxxxx;"); // xxxxxxxxx is the number you want to dial.  

if(mySerial.available())

Serial.print((unsigned char)mySerial.read());


delay(10000); 
delay(10000); 

mySerial.println("ATH"); //End the call.
if(mySerial.available())

Serial.print((unsigned char)mySerial.read());
}


void loop()
{
//Do nothing
}

Using AT Commands to Control GPIO and PWM pins

Note: GPIOs,PWMs and ADC of the SIM808 module are all 2V8 logic.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8);

void setup()
{
mySerial.begin(19200);               // the GPRS baud rate   
delay(2000);
}

void loop()
{
mySerial.println("AT+SPWM=0,63,100");// set PWM 1 PIN

mySerial.println("AT+SGPIO=0,2,1,1");// set GPIO 5 PIN to 1
mySerial.println("AT+SGPIO=0,3,1,1");// set GPIO 6 PIN to 1
delay(1000);  

mySerial.println("AT+SGPIO=0,2,1,0");// set GPIO 5 PIN to 0
mySerial.println("AT+SGPIO=0,3,1,0");// set GPIO 6 PIN to 0
delay(1000);    
}

A Simple Source Code Example

The demo code below is for the Xduino to send SMS message/dial a voice call/submit a http request to a website and upload datas to the pachube. It has been tested on Arduino Duemilanove but will work on any compatible variant, plesse note that this sketch uses the sorfware UART of ATmega328P. please follow the following steps for running this sketch.

  1. With the GPRS Shield removed, download this sketch into your Arduino.
  2. Disconnect the Xduino from USB port to remove power source.
  3. Set the Serial Port jumpers on the GPRS Shield in SWserial position, to use the Soft Serial port of Arduino.
  4. Connect the antenna to the GPRS Shield and insert the SIM Card.
  5. Mount the GPRS Shield on Arduino.
  6. Connect the Arduino to the computer by USB, and fire up your favorite serial terminal software on computer, choose the COM port for Arduino, set it to operate at 19200 8-N-1.
  7. Type command in the terminal to execute different function, threr are 4 functions in the demo:
    1. If you input 't', the demo will send a SMS message to another cellphone which you set(you need set the number in the code);
    2. If you input 'd', the program will dial a call to the other cellphone that you set(it is also need you set in the code );
    3. If you input 'h', it will submit a http request to a web that you want to access(it need you set the web adress in the code), it will return a string from the website if it goes correctly;
    4. If you input 's', it will upload the datas to the pachube(for detail you can refer to the explanation in the code). I strongly recommend you input 'h' before input 's', because uploading datas to the pachube need do some setting, after execute the function of submit a http request, the setting will be set.
  8. If the program returns error in the terminal after you typed the command, don't worry, just try input the command again.


/*Note: this code is a demo for how to using gprs shield to send sms message, dial a voice call and 
send a http request to the website, upload data to pachube.com by TCP connection,

The microcontrollers Digital Pin 7 and hence allow unhindered
communication with GPRS Shield using SoftSerial Library. 
IDE: Arduino 1.0 or later
Replace the following items in the code:
1.Phone number, don't forget add the country code
2.Replace the Access Point Name
3. Replace the Pachube API Key with your personal ones assigned
to your account at cosm.com
 * Modified by keen 
 * Date: 18/03/2017
 * Note: Only fix bug
*/


#include <SoftwareSerial.h>
#include <String.h>

SoftwareSerial mySerial(7, 8);

void setup()
{
mySerial.begin(19200);               // the GPRS baud rate   
Serial.begin(19200);    // the GPRS baud rate 
delay(500);
}

void loop()
{
//after start up the program, you can using terminal to connect the serial of gprs shield,
//if you input 'q' in the terminal, the program will execute  GetSignalQuality(),it will show the signal quality,
//if you input 't' in the terminal, the program will execute SendTextMessage(), it will show how to send a sms message,
//if input 'd' in the terminal, it will execute DialVoiceCall(), etc.

if (Serial.available())
switch(Serial.read()){

case 'q':
GetSignalQuality();
break;
case 't':
SendTextMessage();
break;
case 'd':
DialVoiceCall();
break;
case 'h':
SubmitHttpRequest();
break;
case 's':
Send2Pachube();
break;
}
if (mySerial.available())
Serial.write(mySerial.read());
}
///GetSignalQuality()
///get the signal quality of GSM model.
void GetSignalQuality(){
     String response = ""; 
     long int time = millis();   
     Serial.println("Getting the sinal quality...");
     Serial.println("Tips:+CSQ: XX,QQ : It means the Signal Quality poorly when the XX is '99'!");
     mySerial.println("AT+CSQ");    
     while( (time+2000) > millis()){
        while(mySerial.available()){       
          response += char(mySerial.read());
        }  
      }    
      Serial.print(response);    
}

///SendTextMessage()
///this function is to send a sms message
void SendTextMessage()
{
mySerial.print("\r");
delay(1000);                    //Wait for a second while the modem sends an "OK"
mySerial.print("AT+CMGF=1\r");    //Because we want to send the SMS in text mode
delay(1000);
mySerial.print("AT+CMGS=\"+8613760419846\"\r");    //Start accepting the text for the message
//to be sent to the number specified.
//Replace this number with the target mobile number.
delay(1000);
mySerial.print("Hello,Elecrow!\r");   //The text for the message
delay(1000);
mySerial.write(0x1A);  //Equivalent to sending Ctrl+Z 
}

///DialVoiceCall
///this function is to dial a voice call
void DialVoiceCall()
{
mySerial.println("ATD + +8613760419846;");//dial the number
delay(100);
mySerial.println();
}

///SubmitHttpRequest()
///this function is submit a http request
///attention:the time of delay is very important, it must be set enough 
void SubmitHttpRequest()
{
mySerial.println("AT+CSQ");
delay(100);

ShowSerialData();// this code is to show the data from gprs shield, in order to easily see the process of how the gprs shield submit a http request, and the following is for this purpose too.

mySerial.println("AT+CGATT?");
delay(100);

ShowSerialData();

mySerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");//setting the SAPBR, the connection type is using gprs
delay(1000);

ShowSerialData();

mySerial.println("AT+SAPBR=3,1,\"APN\",\"CMNET\"");//setting the APN, the second need you fill in your local apn server
delay(4000);

ShowSerialData();

mySerial.println("AT+SAPBR=1,1");//setting the SAPBR, for detail you can refer to the AT command mamual
delay(5000);

ShowSerialData();

mySerial.println("AT+HTTPINIT"); //init the HTTP request

delay(3000); 
ShowSerialData();

mySerial.println("AT+HTTPPARA=\"URL\",\"www.google.com.hk\"");// setting the httppara, the second parameter is the website you want to access
delay(3000);

ShowSerialData();

mySerial.println("AT+HTTPACTION=0");//submit the request 
delay(10000);//the delay is very important, the delay time is base on the return from the website, if the return datas are very large, the time required longer.
//while(!mySerial.available());

ShowSerialData();

mySerial.println("AT+HTTPREAD");// read the data from the website you access
delay(300);

ShowSerialData();

mySerial.println("");
delay(100);
}

///send2Pachube()///
///this function is to send the sensor data to the pachube, you can see the new value in the pachube after execute this function///
void Send2Pachube()
{
mySerial.println("AT+CGATT?");
delay(100);

ShowSerialData();

mySerial.println("AT+CSTT=\"CMNET\"");//start task and setting the APN,
delay(1000);

ShowSerialData();

mySerial.println("AT+CIICR");//bring up wireless connection
delay(300);

ShowSerialData();

mySerial.println("AT+CIFSR");//get local IP adress
delay(2000);

ShowSerialData();

mySerial.println("AT+CIPSPRT=0");
delay(3000);

ShowSerialData();

mySerial.println("AT+CIPSTART=\"tcp\",\"api.cosm.com\",\"8081\"");//start up the connection
delay(2000);

ShowSerialData();

mySerial.println("AT+CIPSEND");//begin send data to remote server
delay(8000);
ShowSerialData();
String humidity = "1031";//these 4 line code are imitate the real sensor data, because the demo did't add other sensor, so using 4 string variable to replace.
String moisture = "1242";//you can replace these four variable to the real sensor data in your project
String temperature = "30";//
String barometer = "60.56";//
mySerial.print("\"method\": \"put\",\"resource\": \"/feeds/43634/\",\"params\"");//here is the feed you apply from pachube
delay(500);
ShowSerialData();
mySerial.print(": ,\"headers\": \"X-PachubeApiKey\":");//in here, you should replace your pachubeapikey
delay(500);
ShowSerialData();
mySerial.print(" \"_cXwr5LE8qW4a296O-cDwOUvfddFer5pGmaRigPsiO0");//pachubeapikey
delay(500);
ShowSerialData();
mySerial.print("jEB9OjK-W6vej56j9ItaSlIac-hgbQjxExuveD95yc8BttXc");//pachubeapikey
delay(500);
ShowSerialData();
mySerial.print("Z7_seZqLVjeCOmNbEXUva45t6FL8AxOcuNSsQS\",\"body\":");
delay(500);
ShowSerialData();
mySerial.print(" \"version\": \"1.0.0\",\"datastreams\": ");
delay(500);
ShowSerialData();
mySerial.println("[\"id\": \"01\",\"current_value\": \"" + barometer + "\",");
delay(500);
ShowSerialData();
mySerial.println("\"id\": \"02\",\"current_value\": \"" + humidity + "\",");
delay(500);
ShowSerialData();
mySerial.println("\"id\": \"03\",\"current_value\": \"" + moisture + "\",");
delay(500);
ShowSerialData();
mySerial.println("\"id\": \"04\",\"current_value\": \"" + temperature + "\"],\"token\": \"lee\"");


delay(500);
ShowSerialData();

mySerial.println((char)26);//sending
delay(5000);//waitting for reply, important! the time is base on the condition of internet 
mySerial.println();

ShowSerialData();

mySerial.println("AT+CIPCLOSE");//close the connection
delay(100);
ShowSerialData();

}
void ShowSerialData()
{
while(mySerial.available()!=0)
Serial.write(mySerial.read());
}


 

Using Sms to Control an LED Status

This example is controbuted by MChobby, for more information please visit: http://mchobby.be/wiki/index.php?title=SmsCommand

Send a SMS message "on" or "off" from your cellphone to the GPRS Shield to control the Digital Pin 13(LED) Status.

  • The default Buffer of Rx in SoftwareSerial.h is 32/64, you may experience some data lose while the returns of SIM808 are many(Receiving SMS/TCPIP), you can try to change the Buffer of Rx in SoftwareSerial.h into

#define _SS_MAX_RX_BUFF 128 // RX buffer size


#include <SoftwareSerial.h>
 
SoftwareSerial mySerial(7, 8);
 
// EN: String buffer for the GPRS shield message

String msg = String("");
// EN: Set to 1 when the next GPRS shield message will contains the SMS message

int SmsContentFlag = 0;
 
// EN: Pin of the LED to turn ON and OFF depending on the received message

int ledPin = 13;
 
// EN: Code PIN of the SIM card (if applied)

//String SIM_PIN_CODE = String( "XXXX" );
 
void setup()
{
  mySerial.begin(19200);               // the GPRS baud rate   
  Serial.begin(19200);                 // the GPRS baud rate
 
  // Initialize la PIN
  pinMode( ledPin, OUTPUT ); 
  digitalWrite( ledPin, LOW ); 
}
 
void loop()
{
    char SerialInByte;
 
    if(Serial.available())
    {
       mySerial.print((unsigned char)Serial.read());
     }  
    else  if(mySerial.available())
    {
        char SerialInByte;
        SerialInByte = (unsigned char)mySerial.read();
 
        // EN: Relay to Arduino IDE Monitor
   
        Serial.print( SerialInByte );
 
        // -------------------------------------------------------------------
        // EN: Program also listen to the GPRS shield message.
   
        // -------------------------------------------------------------------
 
        // EN: If the message ends with <CR> then process the message
       
        if( SerialInByte == 13 ){
          // EN: Store the char into the message buffer
        
          ProcessGprsMsg();
         }
         if( SerialInByte == 10 ){
            // EN: Skip Line feed

         }
         else {
           // EN: store the current character in the message string buffer
 
           msg += String(SerialInByte);
         }
     }   
}
 
// EN: Make action based on the content of the SMS. 
//     Notice than SMS content is the result of the processing of several GPRS shield messages.

void ProcessSms( String sms ){
  Serial.print( "ProcessSms for [" );
  Serial.print( sms );
  Serial.println( "]" );
 
  if( sms.indexOf("on") >= 0 ){
    digitalWrite( ledPin, HIGH );
    Serial.println( "LED IS ON" );
    return;
  }
  if( sms.indexOf("off") >= 0 ){
    digitalWrite( ledPin, LOW );
    Serial.println( "LED IS OFF" );
    return;
  }
}
 
// EN: Send the SIM PIN Code to the GPRS shield

//void GprsSendPinCode(){
//  if( SIM_PIN_CODE.indexOf("XXXX")>=0 ){
//    Serial.println( "*** OUPS! you did not have provided a PIN CODE for your SIM CARD. ***" );
//    Serial.println( "*** Please, define the SIM_PIN_CODE variable . ***" );
//    return;
// }
//  mySerial.print("AT+CPIN=");
// mySerial.println( SIM_PIN_CODE );
}
 
// EN: Request Text Mode for SMS messaging

void GprsTextModeSMS(){
  mySerial.println( "AT+CMGF=1" );
}
 
void GprsReadSmsStore( String SmsStorePos ){
  // Serial.print( "GprsReadSmsStore for storePos " );
  // Serial.println( SmsStorePos ); 
  mySerial.print( "AT+CMGR=" );
  mySerial.println( SmsStorePos );
}
 
// EN: Clear the GPRS shield message buffer

void ClearGprsMsg(){
  msg = "";
}
 
// EN: interpret the GPRS shield message and act appropiately

void ProcessGprsMsg() {
  Serial.println("");
  Serial.print( "GPRS Message: [" );
  Serial.print( msg );
  Serial.println( "]" );
 
//  if( msg.indexOf( "+CPIN: SIM PIN" ) >= 0 ){
//     Serial.println( "*** NEED FOR SIM PIN CODE ***" );
 //    Serial.println( "PIN CODE *** WILL BE SEND NOW" );
 //    GprsSendPinCode();
//  }
 
  if( msg.indexOf( "Call Ready" ) >= 0 ){
     Serial.println( "*** GPRS Shield registered on Mobile Network ***" );
     GprsTextModeSMS();
  }
 
  // EN: unsolicited message received when getting a SMS message
  // FR: Message non sollicité quand un SMS arrive
  if( msg.indexOf( "+CMTI" ) >= 0 ){
     Serial.println( "*** SMS Received ***" );
     // EN: Look for the coma in the full message (+CMTI: "SM",6)
     //     In the sample, the SMS is stored at position 6
     int iPos = msg.indexOf( "," );
     String SmsStorePos = msg.substring( iPos+1 );
     Serial.print( "SMS stored at " );
     Serial.println( SmsStorePos );
 
     // EN: Ask to read the SMS store
     GprsReadSmsStore( SmsStorePos );
  }
 
  // EN: SMS store readed through UART (result of GprsReadSmsStore request)  
  if( msg.indexOf( "+CMGR:" ) >= 0 ){
    // EN: Next message will contains the BODY of SMS
    SmsContentFlag = 1;
    // EN: Following lines are essentiel to not clear the flag!
    ClearGprsMsg();
    return;
  }
 
  // EN: +CMGR message just before indicate that the following GRPS Shield message 
  //     (this message) will contains the SMS body

  if( SmsContentFlag == 1 ){
    Serial.println( "*** SMS MESSAGE CONTENT ***" );
    Serial.println( msg );
    Serial.println( "*** END OF SMS MESSAGE ***" );
    ProcessSms( msg );
  }
 
  ClearGprsMsg();
  // EN: Always clear the flag

  SmsContentFlag = 0; 
}

The usage of GPS Function

Print the GPS(GNSS) data with serial port

Note!!! The below usege just suitable for the SIM808 GPRS/GSM+GPS Shield v1.1,becaus the main IC SIM808 was the new version:S2-1060C-21F02.

AT Commands Examples

SIM808 GPRS GSM GPS Shield v1.1 GNSS AT.jpg

Demo code of get the GPS information:

/*
 * Created by Island
 * Modified by keen 
 * Date: 17/03/2017
 */
#include <SoftwareSerial.h>
#define DEBUG true
SoftwareSerial mySerial(7,8); 
        
void setup(){
  Serial.begin(9600);
  mySerial.begin(9600); 
  getgps();
}

void loop(){
   sendData( "AT+CGNSINF",1000,DEBUG);   
}

void getgps(void){
   sendData( "AT+CGNSPWR=1",1000,DEBUG); 
   sendData( "AT+CGPSINF=0",1000,DEBUG); 
}

void sendData(String command, const int timeout, boolean debug){
    String response = "";    
    mySerial.println(command); 
    delay(5);
    if(debug){
    long int time = millis();   
    while( (time+timeout) > millis()){
      while(mySerial.available()){       
        response += char(mySerial.read());
      }  
    }    
      Serial.print(response);
    }    
}

The result of get the GPS information.

SIM808 GPRS GSM GPS Shield v1.1 GNSS code.jpg

The AT commands Bluetooth Function

AT comands Description
AT+BTPOWER=1 Turn on Bluetooth
AT+BTHOST? Query the module name and address
AT+BTSCAN=1,10 Search nearby Bluetooth devices, search time is 10S
AT+BTPAIR=0,1 Request matching
AT + BTPAIR = 1,1 Responds to a connection request
AT + BTGETPROF = 1 Get the services provided by paired Bluetooth devices
AT + BTCONNECT = 1, 4 Active connection to Bluetooth devices
AT + BTSPPSEND = 5 send 5 byte data

Examples

Bluetooth Communication:using Software UART

Note

1.Download a Bluetooth serial assistant(Bluetooth SPP) on your phone.

2.Open the Serial Monitor and Note print informations.

3.How to ensure your BT ID number:

BTID.png

/*
 This example....
 created 16 March 2017
 by Keen & Island
 */
#include <SoftwareSerial.h>
#define SWdebug true
#define HDdebug true
SoftwareSerial GSMSerial(7,8); 

boolean init_flag = true;
String BTname = "Elecrow";  //For example: Modify Bluetooth name as "Elecrow".
String TestTEXT="12345";

void setup(){
  Serial.begin(19200);
  GSMSerial.begin(19200); 
  delay(1000);
  Open_BTpower();              // Turn on Bluetooth
  Current_BThost_Name();       // Show current bluetooth host name
  Hardware_print("Please note:.....",HDdebug);
  Hardware_print("Is the first connection? yes/no",HDdebug);
  Hardware_print("Answer:(yes/no)",HDdebug);
}

void Open_BTpower(){
  Hardware_print("Reset Bluetooth Power status",HDdebug);
  Hardware_print("Tips: if show:AT+BTPOWER=0 ERROR is normal, it means the power has been reset...",HDdebug);
  sendData( "AT+BTPOWER=0",1000,SWdebug);   // Reset Bluetooth status
  Hardware_print("Turn on Bluetooth",HDdebug);
  sendData( "AT+BTPOWER=1",2000,SWdebug);   // Turn on Bluetooth
}

void Current_BThost_Name(){
  Hardware_print("Current bluetooth name is:",HDdebug);
  String command = "AT+BTHOST?";
  sendData( command,1000,SWdebug);   //Show SIM 808 BT Host and address.
}

void Change_BThost_Name(String BThostName){
  String command = "AT+BTHOST="+BThostName; //Change SIM 808 BT name
  Hardware_print("Change bluetooth name....",HDdebug);
  sendData( command,2000,SWdebug);
  Hardware_print("The new bluetooth name is:",HDdebug);
  sendData( "AT+BTHOST?",1000,SWdebug);  //Show SIM 808 BT Host
}

void BTscan(){
  String command = "AT+BTSCAN=1,10";
  Hardware_print("Looking for nearby Bluetooth.......",HDdebug);
  Hardware_print("Tips: Scanning the Bluetooth and it will show on the Serial Monitor after about 30S",HDdebug);
  Hardware_print("Notes:Setting your phone Bluetooth can be search. At the same time, open your Bluetooth SPP... ",HDdebug);
  Hardware_print("      If your phone receives a request, please confirm it...",HDdebug);
  Hardware_print("      Make sure your phone BT ID is 1, if not ,please try again...",HDdebug);
  sendData( command,30000,SWdebug);
}

void Clear_BT_list_device(){
  Hardware_print("Tips: if show:AT+BTUNPAIR=0 ERROR is normal, it means the list has been reset...",HDdebug);
  sendData( "AT+BTUNPAIR=0",1000,SWdebug); //Clear BT list
  delay(1000);
}

void Connect_BT_device(){
  delay(1000);
  String command1 = "AT+BTPAIR=0,1"; //Matching Bluetooth device(ID:1)
  sendData( command1,4000,SWdebug);
  Hardware_print("Tips: If show:AT+BTPAIR=0,1 ERROR,please try again...",HDdebug);
  String command2 = "AT+BTPAIR=1,1";//Response request
  sendData( command2,2000,SWdebug);
  delay(1000);
  sendData( "AT+BTGETPROF=1",10000,SWdebug);  //Get paired bluetooth device support services
  Hardware_print("Tips: If show:AT+BTGETPROF=1 ERROR,please try again...",HDdebug);
  delay(3000);
  String command3 = "AT+BTCONNECT=1,4";      //Use SPP services
  sendData( command3,3000,SWdebug);
  delay(3000);
}

void Hardware_print(String data, boolean debug){
  if(debug){
    Serial.println(data);
  }
}

void sendData(String command, const int timeout, boolean debug){
    String comdata = "";    
    GSMSerial.println(command); 
    long int time = millis();   
    while( (time+timeout) > millis()){
      while(GSMSerial.available()){       
        comdata += char(GSMSerial.read());
      }  
    }    
    if(debug){
      Serial.print(comdata);
    }    
}

void init_BT(){
    if(init_flag){
      while(1){
         if (Serial.available()>0){
            if (Serial.find("yes")){
               Change_BThost_Name(BTname);  // Modify Bluetooth name
               Clear_BT_list_device();      // Reset the BT device list
               BTscan();                    // Scan Bluetooth
               Connect_BT_device();
              }else { 
                sendData( "AT+BTCONNECT=1,4",5000,SWdebug);
                Hardware_print("Tips: And now you can use Bluetooth SSP communicate with Serial Monitor.",HDdebug);
                Hardware_print("      On the Serial Monitor, string (TestTEXT) will be send after you enter 'send'...",HDdebug);
                delay(1000);
              } break;
          }
      }
      init_flag=false;
    }
}

void com_data_judgment(){
  
  if (Serial.available()){
    if (Serial.find("send")){
      Hardware_print("Tips:Enter 'send' on Serial Monitor,the String (TestTEXT) will be send...",HDdebug);
      sendData( "AT+BTSPPSEND=5",3000,SWdebug);  //Send 5 bytes length text
      sendData(TestTEXT,3000,SWdebug);           // Send test TEXT info
      delay(1000);
    }
  }
  if(GSMSerial.available())  //Print information from SIM808
    Serial.print((char)GSMSerial.read());
}
void loop(){
  init_BT();
  com_data_judgment();
}

FAQ

You can list you question here or contact with techsupport@elecrow.com for technology support.

How to buy

You can click here to buy SIM808 GPRS/GSM+GPS Shield.

How to upgrade bluetooth function

Please refer to this tutorial

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