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Interfacing GSM Module with 8051 microcontroller (AT89C51) without using PC

Summary

Developed By: 
Himanshu Choudhary
This project presents a way to interface GSM module with microcontroller AT89C51 without making use of computer to send AT commands to the module. This is an improvement over the previous projects (see MC074 & MC075). Instead of using HyperTerminal or any other PC interface, the controller itself sends a fixed AT command to the GSM/GPRS module. The information response and result codes are received and displayed on a 16x2 LCD.
 
Interface GSM with 8051 Microcontroller (AT89C51)

Description

Instead of sending commands from the HyperTerminal, AT commands are sent to the GSM/GPRS module by the microcontroller itself. In this case, the receive (Rx) and transmit (Tx) pin of the GSM module’s RS232 port are connected to the transmit (Tx) and receive (Rx) pin of AT89C51’s serial port, respectively. This eliminated the role of computer and just the controller’s circuit provides a complete user interface for the module.
 
The controller is programmed to send a fixed command ‘AT’ to the module. The command AT is used to check the communication with module. It returns a result code OK if the module and the controller are connected properly. If either of the module or SIM are not working, it returns a result code ERROR.
The program complexities for display of information responses and result codes on LCD mentioned in MC075 remain same here as well.
 

Circuit Diagram

Code

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Components

MAX232 | IC MAX232
MAX232
 
The MAX232 IC is used to convert the TTL/CMOS logic levels to RS232 logic levels during serial communication of microcontrollers with PC. The controller operates at TTL logic level (0-5V) whereas the serial communication in PC works...
AT89C51 Microcontroller, Atmel 89C51 Controller Image
AT89C51 Microcontroller

AT89C51 is an 8-bit microcontroller and belongs to Atmel's 8051 family. ATMEL 89C51 has 4KB of Flash programmable and erasable read only memory (...

16 x 2 LCD | 16x2 Character LCD Module
LCD

 

LCD (Liquid Crystal Display) screen is an electronic display module and find a wide range of applications. A 16x2 LCD display is very basic module and is very commonly used in various devices and circuits. These modules are preferred over seven segments...

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