C program for gsm modem

Mobile communication is an emerging technology these days. GSM module is wireless modem that transmits data using radio waves. GSM architecture is similar to the mobile architecture. GSM modems are generally used in many electronic applications and they are required to interface with the microcontrollers.

The main principle of this circuit is to interface a GSM modem with the microcontroller. The microcontroller used is AT89C51 microcontroller. Microcontroller sends these commands to the GSM modem, which is then activated to perform the required operation.

GSM has RS interface for serial communication. MAX IC is used for converting the logic levels. MAX IC has 16 pins. This is a dual driver IC as it has two transmitters and receivers. The transmitter pin T1IN of max is connected to the transmitter pin of the microcontroller.

The receiver pin R1out of the max is connected to the receiver pin of the microcontroller. Two 0. Another 1uf capacitor is grounded from pin6 and another capacitor is connected to the supply of 5v from the through the 2 nd pin of the IC.

GSM modem used here has sim module. These wireless modems communicate with the microcontrollers and other devices. This has 4 pins compatible to TTL logic.

These can be directly connected to the microcontroller as it has max or use the DB9 connector to connect to the controller. This should be connected to the power supply of 5v. It has a sim slot similar to a mobile to communicate with the network. GSM modem requires AT commands for activation. GSM modem responds to the AT command. An LCD module is connected to the port2 of the microcontroller.

This article also shows the interfacing of 4-bit LCD module to the microcontroller. A pot is connected to the LCD to adjust the intensity of the display. Here LCD is used for displaying the received message. This button is used for sending a message. Although GSM has many advantages there are some limitations. This cannot be used in applications where immediate result is required as it may not work if there are no signals.

Why you need this project code? No, Give us more details about your project.Remember Me? Thread: C program GSM modem. C program GSM modem. Hello experts, How can i interact with GSM modem to send the message to the particular mobile using C program? Any help is appreciated, abhimohpra. Fact - Beethoven wrote his first symphony in C. Is there any generic instruction set available to send the message AT commands to any modem through C program?

The Hays command set AT commands are supposed to be standardised, but I've found that they frustratingly slightly vary from modem to modem. You need to include the modem name in a Google search for the AT commands to get the specific instructions used Also, it might be a good idea to research what other people have done with your modem on Google as a starting point The search string that I typed in was SIMCOM SMS which dug up quite a few good examples.

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Gammu is a project that automates this for you if you don't want to program it yourself, want to use an established library, or just want to see how they do it. I use it to run the SMS gateway for a small school - we do everything from act on remote authenticated commands e. DON'T just ignore them. Replies: 17 Last Post:AM. Replies: 0 Last Post:AM. Replies: 2 Last Post:AM. Modem use By Luckybob in forum Windows Programming. Replies: 1 Last Post:AM.

Replies: 10 Last Post:PM. All times are GMT The time now is PM. All rights reserved.SMS client and server is an application software which is used for sending and receiving messages SMS. It listens for incoming messages to arrive, processes the message if it's in a valid format. Note the processing of arrived messages depends on the application which will be discussed later.

I am going to explain the following things:. Comm is an object of type GsmCommMain which is required for sending and receiving messages. Then try to open with the above settings.

We can test the Comm port settings by clicking on the Test button after selecting the Comm port, baud rate and Time out. Sometimes if the comm port is unable to open, you will get a message "No phone connected".

This is mainly due to Baud rate settings. Change the baud rate and check again by clicking the Test button until you get a message "Successfully connected to the phone.

c program for gsm modem

Before creating a GSMComm object with settings, we need to validate the port number, baud rate and Timeout. The EnterNewSettings does validation, returns true if valid, and will invoke SetData port,baud,timeout for comm setting. The following block of code will try to connect. If any problem occurs "Phone not connected" message appears and you can either retry by clicking on the Retry button or else Cancel. The above code will read all unread messages from SIM memory.

Send Bulk SMS From Computer to any phone number using GSM Modem and Sim Card

The method ShowMessage is used for displaying the read message. Create a PDU for sending messages. We can create a PDU in straight forward version as:. You can read all messages from the phone memory of SIM memory. Just click on "Read All Messages" button. The message details such as sender, date-time, text message will be displayed on the Data Grid. Create a new row for each read message, add to Data table and assign the Data table to datagrid's source. The only change in processing Received message and Read message is the first parameter.

All messages which are sent by the users will be stored in SIM memory and we are going to display them in the Data grid. We can delete a single message by specifying the message index number. Messages are deleted based on the index.

c program for gsm modem

Every message will be stored in memory with a unique index. The customer has agreed for pre paid electricity recharges with the help of recharge coupons.Hello experts, How can i interact with GSM modem to send the message to the particular mobile using C program? Any help is appreciated, abhimohpra. Is there any generic instruction set available to send the message AT commands to any modem through C program? The Hays command set AT commands are supposed to be standardised, but I've found that they frustratingly slightly vary from modem to modem.

You need to include the modem name in a Google search for the AT commands to get the specific instructions used Also, it might be a good idea to research what other people have done with your modem on Google as a starting point The search string that I typed in was SIMCOM SMS which dug up quite a few good examples.

Gammu is a project that automates this for you if you don't want to program it yourself, want to use an established library, or just want to see how they do it. I use it to run the SMS gateway for a small school - we do everything from act on remote authenticated commands e. All times are GMT The time now is PM. All rights reserved.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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I'll release the source code on bitbucket soon, or you can download some serial port library such. CSerialPort window only. I suggest you to learn better how serial port communication work. Look at wikipedia. You can access the COM port from your code, and manipulate the settings. Your question seems very generic about serial port, so I couldn't be specific.

However, here is some help. Just pass the COM port name instead of a filename. Learn more. Asked 6 years, 10 months ago. Active 6 years, 10 months ago. Viewed 3k times. How can I access ports? What OS? Windows, Linux, Mac? Use Boost.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

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I have a usb gsm modem of type lightWave. I found this code in c that can receive, send, delete and read sms message from this modem but when a new message arrives to modem, the event that should be raised when new message is received does not get raised. I don't know what the problem is; however, I can read this message from sim after received, but I want the event of received message raised when message arrive this part of code:.

This code in C I founded at codeproject. And then check comm is properly initialized. Learn more. Asked 8 years, 9 months ago. Active 7 years ago. Viewed 5k times.

Send sms using gsm module and pic microcontroller

CenterScreen; dlg. SetData port, baudRate, timeout ; if dlg. GetData out port, out baudRate, out timeout ; CommSetting. WaitCursor; CommSetting.

Default; CommSetting. If you don't set the Handshake property then you have to set the hardware handshake signals yourself.

Set the RtsEnable and DtrEnable properties to true. Instead of using GSMcomm you must put your own handler to receive the data and take decisions accordingly.

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I would like to test it sending a simple message in my mobile. I can do it with emulators like cutecom and minicom because I have raspbian linux version.

I do not use Arduino, only a SMB. I wrote this code until now and of course it does not work yet. Learn more. Asked 6 years, 11 months ago. Active 6 years, 11 months ago. Viewed 4k times. Active Oldest Votes.

How to Send and Receive SMS Using GSM Modem

Mats Petersson Mats Petersson k 12 12 gold badges silver badges bronze badges. You may want to do some error checking as well Sign up or log in Sign up using Google.

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c program for gsm modem

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