GSM modem interface with 8051 microcontroller for SMS control of industrial equipment :
This is a beginner's tutorial in which a GSM modem is being interfaced with the AT89s51 microcontroller for SMS communication. The SMS can be sent and received for data exchange and status and control information. There are many project applications based on the 8051 microcontroller and the GSM interconnect.
We can use it as remote control of industrial machines or we can sue it for home automation or we can use it for the safety of the home or the control of office.gsm 8051
The sending SMS via the GSM modem when interfaced with the microcontroller or PC is much simpler compared to sending SMS via modem in the PDU mode. Text message can be sent through the modem using the interface only three signals from the serial interface of the modem with the microcontroller,, RxD and GND. In this scheme the GSM modem serial port interface RTS and CTS signals are connected to each other. The microcontroller serial port transmission signal is connected to the transmission signal (TxD) of the serial interface of the GSM modem while receiving The serial port signal of the microcontroller is connected to the receive signal (RxD) of the serial interface of the microcontroller. GSM modem. The COMPIM serial port model shown in the schematic diagram developed in Proteus VSM is equivalent to the serial interconnection of the GSM modem. / PC using AT commands (AT + CMGS, AT + CMSS)
8051 projects based on messages received on the mobile
Lock the circuit diagram of the GSM interface with the 8051 microcontroller
The AT commands and the sequence of events performed to send text messages to a mobile phone via the GSM modem connected to the microcontroller are shown below:
1. First select the text mode for SMS by sending the following AT command to the GSM modem: AT + CMGF = 1. This command configures the GSM modem in text mode.
2. Send the following AT command to send text message SMS together with the mobile phone number to the GSM modem: AT + CMGS = + 923005281046. This command sends the mobile number of the mobile receiver to the GSM modem.
3. Send the text message string ("hello!") To the GSM modem This is a UART test message "
4. Send the ASCII code for CTRL + Z ie 0x1A to the GSM modem to transmit the message to the mobile phone. After the message string has been sent to the modem, send CTRL + Z to the microcontroller, which is equivalent to 0x1A (ASCII Value). Each AT command is followed by, for example, carriage return and line feed
You are giving the advance of the first line and the return of the car after that.
"\ R" stands for carriage return
8051 interface with the gsm modem equipped with RS232 serial interface is the same as the AVR interface with the GSM modem.
The text message SMS can contain up to 140 characters at most. It depends on the amount of information collected from GPS Engine that you need at the base station to track vehicles or people.
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