Wireless Notice Board Using GSM and Arduino

Wireless notice board is very selective term for this project, as it has a very wide scope rather than just being a simple notice board. First we should understand the purpose of this project, in this system we can display a message or notice to some display device like LCD, and this message can be easily set or changed from anywhere in the world, just by using the SMS facility of your mobile handset. Whatever notice we want to display, just send the SMS of that text, with some prefix and suffix.

 

This is very useful in Hotels, Malls, college, offices and can be used anywhere, even at home. Like you can set the message like “Do not disturb” at your hotel’s room gate, can set message at your home’s door step when you are away, and of course it is used as notice board in schools, colleges, cinema halls etc. And yes, it’s just not a simple Message board, the usefulness of this project is that you can set or change the message or notice from anywhere, just sending SMS from your phone.

 

We have previously used the SMS facility of mobile phone for home security and control the home appliances remotely: PIR Sensor and GSM Based Security System and GSM Based Home Automation using Arduino

Working Explanation:

In this project, Arduino UNO is used for controlling the whole process, GSM module (SIM900A) to receive the SMS/message sent from mobile phone and LCD to display the message.

GSM Arduino and LCD for wireless notice board

We can send some message or notice like “#Circuit Digest*”, “#We Welcomes You*” through the SMS. Here we have used a prefix in the message string that is ‘#’. This prefix is used to identify the starting of the message or notice. And ‘*’ is used as suffix to indicate the end of the message or notice.

 

When we send SMS from mobile phone to GSM module then GSM receives that SMS and sends it to Arduino. Now Arduino read this SMS and extract main notice message from the received string and stores in another string.  And then sends the extracted message to 16x2 LCD by using appropriate commands.

Wireless Notice Board Using GSM Block-diagram

Further working of this system is explained in the ‘Code Description’ section below. Before we get into programming details we should know about GSM module.

GSM Module:

GSM module is used in many communication devices which are based on GSM (Global System for Mobile Communications) technology. It is used to interact with GSM network using a computer. GSM module only understands AT commands, and can respond accordingly. The most basic command is “AT”, if GSM respond OK then it is working good otherwise it respond with “ERROR”. There are various AT commands like ATA for answer a call, ATD to dial a call, AT+CMGR to read the message, AT+CMGS to send the sms etc. AT commands should be followed by Carriage return i.e. \r (0D in hex), like “AT+CMGS\r”. We can use GSM module using these commands:

ATE0 For echo off

AT+CNMI=2,2,0,0,0  <ENTER>           Auto opened message Receiving.  (No need to open message)

ATD<Mobile Number>; <ENTER>      making a call (ATD+919610126059;\r\n)

AT+CMGF=1 <ENTER>                        Selecting Text mode

AT+CMGS=”Mobile Number” <ENTER>  Assigning recipient’s mobile number

>>Now we can write our message

>>After writing message

Ctrl+Z  send message command (26 in decimal).

ENTER=0x0d in HEX

GSM-Module-SIM900A

The SIM900 is a complete Quad-band GSM/GPRS Module which delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS and Data with low power consumption.

 

Circuit Description:

Connections of Wireless Notice Board using GSM and Arduino are simple and shown in the figure below. Here a liquid crystal display (LCD) is used for display the “Notice” or message, which is sent though the mobile phone as SMS. Data pins of LCD namely RS, EN, D4, D5, D6, D7 are connected to arduino digital pin number 7, 6, 5, 4, 3, 2. And Rx and Tx pin of GSM module is directly connected at Tx and Rx pin of Arduino respectively. And GSM module is powered by using a 12 volt adaptor.

Wireless Notice Board using GSM circuit diagram

Code Description:

The code of the program is easily understandable; the new thing here is GSN initialization function gsm_init(), which is explained in the end.

In the program, first of all we include library for liquid crystal display (LCD) and then we defines data and control pins for LCD and some variables.

#include <LiquidCrystal.h>
LiquidCrystal lcd(7,6,5,4,3,2);

int led=13;

int temp=0,i=0,x=0,k=0;
char str[100],msg[32];

After this, serial communication is initialized at 9600 bps and gives direction to used pin. And initialize GSM Module in setup loop.

void setup() 
{
  lcd.begin(16,2);
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  digitalWrite(led, HIGH);
  lcd.print("GSM Initilizing...");
  gsm_init();
  lcd.setCursor(0,0);
  lcd.print("Wireless Notice");

 For receiving data serially we use two functions, one is Serial.available which checks any serial data is coming or not and other one is Serial.read which reads the data that comes serially.

void serialEvent()
{
  while(Serial.available())
  {
    char ch=(char)Serial.read();
    str[i++]=ch;
    if(ch == '*')
    {
      temp=1;
      lcd.clear();
      lcd.print("Message Received");
      delay(1000);
    }
  }
}

After receiving data serially, we store it in a string and this string is checked for ‘#’ and ‘*’, to find the starting and ending of the Notice or message. Then finally Notice is printed on LCD using lcd.print:

void loop()    
{
  for(unsigned int t=0;t<60000;t++)
  {
    serialEvent();
  if(temp==1)
  {
    x=0,k=0,temp=0;
    while(x<i)
    {
      while(str[x]=='#')
      {
        x++;
        while(str[x]!='*')
        {
          msg[k++]=str[x++];

Initialization function ‘gsm_init()’ for GSM is important here, where firstly, GSM module is checked whether it is connected or not by sending ‘AT’ command to GSM module. If response OK is received, means it is ready. System keeps checking for the module until it becomes ready or until ‘OK’ is received. Then ECHO is turned off by sending the ATE0 command, otherwise GSM module will echo all the commands. Then finally Network availability is checked through the ‘AT+CPIN?’ command, if inserted card is SIM card and PIN is present, it gives the response +CPIN: READY. This is also check repeatedly until the network is found. This can be clearly understood by the Video below.

void gsm_init()
{
  lcd.clear();
  lcd.print("Finding Module..");
  boolean at_flag=1;
  while(at_flag)
  {
    Serial.println("AT");
    while(Serial.available()>0)
    {
      if(Serial.find("OK"))
      at_flag=0;
    }
    delay(1000);
  }
Code: 

#include <LiquidCrystal.h>
LiquidCrystal lcd(7,6,5,4,3,2);

int led=13;

int temp=0,i=0,x=0,k=0;
char str[100],msg[32];

void setup() 
{
  lcd.begin(16,2);
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  digitalWrite(led, HIGH);
  lcd.print("GSM Initilizing...");
  gsm_init();
  lcd.setCursor(0,0);
  lcd.print("Wireless Notice");
  lcd.setCursor(0,1);
  lcd.print("    Board      ");
  delay(2000);
  lcd.clear();
  lcd.print("Circuit Digest");
  delay(1000);
  lcd.setCursor(0,1);
  lcd.print("System Ready");
  Serial.println("AT+CNMI=2,2,0,0,0");
  delay(500);
  Serial.println("AT+CMGF=1");
  delay(1000);
  digitalWrite(led, LOW);
}

void loop()    
{
  for(unsigned int t=0;t<60000;t++)
  {
    serialEvent();
  if(temp==1)
  {
    x=0,k=0,temp=0;
    while(x<i)
    {
      while(str[x]=='#')
      {
        x++;
        while(str[x]!='*')
        {
          msg[k++]=str[x++];
        }
      }
      x++;
    }
    msg[k]='\0';
    lcd.clear();
    lcd.print(msg);
    delay(1000);
    temp=0;
    i=0;
    x=0;
    k=0;
  }
  }
  lcd.scrollDisplayLeft();
}
void serialEvent()
{
  while(Serial.available())
  {
    char ch=(char)Serial.read();
    str[i++]=ch;
    if(ch == '*')
    {
      temp=1;
      lcd.clear();
      lcd.print("Message Received");
      delay(1000);
    }
  }
}

void gsm_init()
{
  lcd.clear();
  lcd.print("Finding Module..");
  boolean at_flag=1;
  while(at_flag)
  {
    Serial.println("AT");
    while(Serial.available()>0)
    {
      if(Serial.find("OK"))
      at_flag=0;
    }
    delay(1000);
  }

  lcd.clear();
  lcd.print("Module Connected..");
  delay(1000);
  lcd.clear();
  lcd.print("Disabling ECHO");
  boolean echo_flag=1;
  while(echo_flag)
  {
    Serial.println("ATE0");
    while(Serial.available()>0)
    {
      if(Serial.find("OK"))
      echo_flag=0;
    }
    delay(1000);
  }

  lcd.clear();
  lcd.print("Echo OFF");
  delay(1000);
  lcd.clear();
  lcd.print("Finding Network..");
  boolean net_flag=1;
  while(net_flag)
  {
    Serial.println("AT+CPIN?");
    while(Serial.available()>0)
    {
      if(Serial.find("+CPIN: READY"))
      net_flag=0;
    }
    delay(1000);
  }
  lcd.clear();
  lcd.print("Network Found..");
  delay(1000);
  lcd.clear();
}

Video: 

Comments (62)

  • Graham's picture
    Graham

    Thanks a ton, this is one of the few examples of RECEIVING a SMS that work, there are zillions of ones for sending but so few like yours

    Jan 26, 2016
  • saddam khan's picture
    saddam khan

    Thank Buddy..

    Jan 27, 2016
  • sachin's picture
    sachin

    GSM receiving the message and showing on serial monitor but not displaying on LCD . What may be the reason???

    Feb 15, 2016
  • Vivek's picture
    Vivek

    Have you fixed your circuit in PCB???

    Nov 28, 2016
  • Abhishek's picture
    Abhishek

    Check circuit connections and code.

    Feb 23, 2016
  • PRINCE SANGWAN's picture
    PRINCE SANGWAN

    how would i intialise the the gsm module after writing the code in arduino, like how would i write those AT commands in gsm module?and would u mind sharing ur mail id for further communication?

    Feb 05, 2016
  • saddam khan's picture
    saddam khan

    saddam4201 at gmail.com

    Feb 07, 2016
  • Rahul soni's picture
    Rahul soni

    sir.How to Display the message on Led matrix .please tell what I modify in the Program and circuit diagram.

    Jan 31, 2017
  • sachin's picture
    sachin

    The above code after some modification is able to receive message and display it on serial monitor but not on LCD display please help me. your email id is not correct.

    Feb 29, 2016
  • sachin's picture
    sachin

    I have modified the code attached because initially it wasn’t working.
    Still it is not working i.e. the message send through gsm module is not displaying on LCD but it showing on the serial monitor.
    Is there any problem in reading data serially and displaying??
    According to your code the string is in # and *???
    Please help me out….
    Resolve the issue.

    Feb 29, 2016
  • Maddy's picture
    Maddy

    yes, string is in # and *. The code and circuit diagram are correct, please cross check them twice. Check you LCD, whether it is working properly. What are you getting on LCD.

    Mar 11, 2016
  • SoloDE's picture
    SoloDE

    what program do you use to draw your circuit diagram ?
    thank you

    Mar 02, 2016
  • Maddy's picture
    Maddy

    Proteus with Arduino Library installed.

    Mar 11, 2016
  • Rey's picture
    Rey

    can you please help me design a circuit diagram for an a Wireless Notice Board using Arduino Uno and GSM?

    Apr 08, 2016
  • shaikshavez's picture
    shaikshavez

    I truly appreciate your work, you have really helped me like anything. Thanks for this bro.!!

    Mar 24, 2016
  • shambel wondimnew's picture
    shambel wondimnew

    dear pleas send me the full document for this project that i need to do the same project to my company

    Apr 09, 2016
  • Paul Bradfield's picture
    Paul Bradfield

    Interesting reading. I want to setup wireless notice board using SMS. Can I just use a tablet to receive TXt's with a sim, instead of a GSM module & just adapt the tablet to read more as a noticeboard ?

    Apr 20, 2016
  • Abhishek's picture
    Abhishek

    You can use Tablet in place of Mobile Phone.

    May 06, 2016
  • SOHEL's picture
    SOHEL

    can i use Bengali language in LCD display. Please help.

    Jun 15, 2016
  • rahul kapoor's picture
    rahul kapoor

    sir,dont we need to set baud rate to 2400 as SIM900A does not work with 9600 baud rate.

    Jun 25, 2016
  • abi's picture
    abi

    please attach the correct coding for us pls

    Jul 20, 2016
  • saddam khan's picture
    saddam khan

    Code is tested you may go ahead with the same given on the website....

    best of luck

    Jul 25, 2016
  • Udaykiran Reddy's picture
    Udaykiran Reddy

    i have used arduino mega 2560 & GSM 800,do i have to change any part of the code as i was not able to display message.

    Jul 28, 2016
  • Tim's picture
    Tim

    Thanks for a brilliant tutorial, nice and easy to follow. Mine does however refuse to display long messages (I would like to display about 30/40 words) but when I try this it either freezes/doesn't display any text at all or reboots by running through the GSM initializing, ECHO off and etc. How do I get it to recieve and display longer messages?
    Thanks in advance :)

    Aug 03, 2016
  • Maddy's picture
    Maddy

    You can display long messages by using the given program itself, it is using lcd.scrollDisplayLeft(); function for scrolling the long messages. I think there may be some problem in your hardwares.

    Aug 20, 2016
  • Muhammad Usman's picture
    Muhammad Usman

    I don't know how to Thank you You really made my day...
    May you get more & more success.

    Sep 07, 2016
  • harish 's picture
    harish

    nice

    Sep 09, 2016
  • NDEBELE's picture
    NDEBELE

    the code just jumps to Finding module, and nothing else, may you please send me one that works well.

    Oct 18, 2016
  • manish's picture
    manish

    Did you get the solution for this problem..please tell me solution if u know

    Mar 24, 2017
  • Akshay yadav's picture
    Akshay yadav

    i m also getting the same problem ,the code just jumps to Finding module, and nothing else, may you please send me one that works well.

    Oct 27, 2016
  • Abhishek's picture
    Abhishek

    It is the problem related to GSM Module, try to just connect GSM module and send AT command and then check whether your GSM responds with OK. Use serial monitor to check the response.

    Nov 30, 2016
  • usman's picture
    usman

    hello sir!iam using gsm 800L.everything is ok but msg is not getting receoved and displayed on the lcd.

    Nov 17, 2016
  • curious's picture
    curious

    is there something bigger than that 16*2 LCD sir/ma'am? something that can be used for larger establishments? grateful if you notice me.

    Nov 19, 2016
  • usman's picture
    usman

    no its16*2 lcd display,by the way iam sir :)

    Nov 24, 2016
  • Emdaddul Bari Fahad's picture
    Emdaddul Bari Fahad

    All term has complete & shown in display, but it doesn't work for sending massese. How can i send SMS? and how can it displayed??.........Please help me...............

    Dec 07, 2016
  • Rose Edillo's picture
    Rose Edillo

    Is there a way to extend the 32 character limit displayed still using the 16x2 lcd?

    Dec 13, 2016
  • usman's picture
    usman

    it worked! i have changed the pins to pin no 10 and 11 and it worked and a little bit change in the code.

    Dec 19, 2016
  • Manish's picture
    Manish

    Hey please share the modified code.

    Mar 25, 2017
  • naveenkumar's picture
    naveenkumar

    insert a buzzer to this project and this buzzer is on when message is received by the gsm module

    Jan 06, 2017
  • Sanket's picture
    Sanket

    Sir I have setup all the connections like yours but i only have the problem with the gsm module yhat it indicate "Finding Module.." on LCD display. Please Sir caan you please solve my problem...

    Jan 16, 2017
  • manaswini's picture
    manaswini

    Sir, I need to make this one with a bigger dispaly.Is it possible??

    Jan 20, 2017
  • madhuri's picture
    madhuri

    Thanks a lot
    But after making all connections I could see only finding module on LCD and could not see any thing further could you help me out

    Jan 28, 2017
  • Mostak khan's picture
    Mostak khan

    sir I also need to make this one with a bbigger lcd.is it possible?please tell me

    Jan 28, 2017
  • Raj's picture
    Raj

    Hi saddam, Great work. i'm an electronics enthusiast and try to build circuits and write codes. Every thing seems to be gud but the msg sent to the sim is not getting displayed on the screen. Pls suggest what can i do next.

    Feb 01, 2017
  • Prashanth's picture
    Prashanth

    the above code is showing that it has Stray/302 error

    Feb 06, 2017
  • kalyan's picture
    kalyan

    Sir , is this code suitable for 128x64 LCD???

    Feb 07, 2017
  • Maddy's picture
    Maddy

    No, this code is not suitable for drive 128x64 LCD

    Mar 04, 2017
  • babith's picture
    babith

    is that the code is correct .... have you cheacked it ? if anyone changed the code pls comment .... also give your correct mail id pls

    Feb 13, 2017
  • JOSEPHINE's picture
    JOSEPHINE

    How to compile the above program? and which software?

    Feb 22, 2017
  • NITHIN S U's picture
    NITHIN S U

    sir can i use larger display instead of 16*2 lcd

    Mar 03, 2017
  • prathima's picture
    prathima

    code is showing some warnings in gsm_init()

    if(Serial.find("OK"))

    if(Serial.find("+CPIN: READY"))

    Mar 23, 2017
  • Sid's picture
    Sid

    Just showing finding GSM module pls share the proper code

    Mar 24, 2017
  • Max's picture
    Max

    Is it possible to use a passkey for authentication? if so, can you please show me how?

    Mar 28, 2017
  • manahil's picture
    manahil

    how to do it using microcontroller?and use more than one lcd for example 2lcd

    Mar 30, 2017
  • SHaheer's picture
    SHaheer

    hey maddy
    I have connected and write code on arduino as per this website . after running Lcd MONITER SHOWS"Circuit digest System ready.But when i send messages it shows same. that means message is not displaying ,or it may not receving.Can you help me ? is there anything that i have to modified these code ? hoping a convenient reply from you.

    Mar 31, 2017
  • thirupathi's picture
    thirupathi

    code is showing some warnings in gsm_init()
    if(Serial.find("OK"))
    if(Serial.find("+CPIN: READY"))

    Apr 01, 2017
  • Akash's picture
    Akash

    Arduino: 1.8.2 (Windows 10), Board: "Arduino/Genuino Uno"

    Build options changed, rebuilding all
    C:\Users\akash\Documents\Arduino\LCD_test1\LCD_test1.ino: In function 'void gsm_init()':

    C:\Users\akash\Documents\Arduino\LCD_test1\LCD_test1.ino:92:26: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]

    if(Serial.find("OK"))

    ^

    C:\Users\akash\Documents\Arduino\LCD_test1\LCD_test1.ino:109:26: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]

    if(Serial.find("OK"))

    ^

    C:\Users\akash\Documents\Arduino\LCD_test1\LCD_test1.ino:126:36: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]

    if(Serial.find("+CPIN: READY"))

    ^

    Sketch uses 4118 bytes (12%) of program storage space. Maximum is 32256 bytes.
    Global variables use 608 bytes (29%) of dynamic memory, leaving 1440 bytes for local variables. Maximum is 2048 bytes.
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x69
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x69
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x69
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x69
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x69
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x69
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x69
    Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x69
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x69
    avrdude: stk500_recv(): programmer is not responding
    avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x69

    This report would have more information with
    "Show verbose output during compilation"
    option enabled in File -> Preferences.

    May 04, 2017
  • kishan's picture
    kishan

    sir hw does the program read the balance in sim, and how to recharge it again, or how to check bal in it
    can we contact you sir pls,,we r doing this proj as our final yr project, please help us out
    even if you are charging money for its okay, please help us out

    May 10, 2017
  • m.pallavi's picture
    m.pallavi

    if instead of lcd display we use leds(24x6)

    May 20, 2017

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