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Deleting SMS from SIM808 GSM/GPRS/GPS Modem with ATmega32

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In this project, we will learn Deleting SMS from SIM808 GSM/GPRS/GPS Modem with AVR ATmega32 Microcontroller. Here, we will delete a text message(SMS) from the SIM808 GSM/GPRS/GPS modem memory with ATmega32 microcontroller and we will display the status of the SMS deleting in a 16X2 alphanumeric LCD.

When the SIM808 GSM/GPRS/GPS modem power is turned on, the ATmega32 microcontroller reads the initial status data sent by the SIM808 GSM/GPRS/GPS modem through USART protocol. After reading the status data, the ATmega32 microcontroller processes the SIM808 GSM/GPRS/GPS modem status data and displays the status of the modem and SIM in the alphanumeric LCD. If SIM card is not present, then "Plz Insert SIM" is displayed, if SIM card is present and modem is ready, then "SIM900 is Ready" is displayed and for other conditions, "SIM900 Error" is displayed in the alphanumeric LCD.

Now, when the SIM808 GSM/GPRS/GPS modem is ready, the ATmega32 microcontroller will send the "AT+CMGD" AT command( AT+CMGD command is used to delete a SMS) with the memory location to the SIM808 GSM/GPRS/GPS modem. In response to the AT command, the SIM808 GSM/GPRS/GPS modem will a send a response to the ATmega32 microcontroller. The ATmega32 microcontroller will analyse the response and accordingly it will display the status of SMS deleting in the alphanumeric LCD. The alphanumeric LCD will display "SMS Deleted" if the SMS is deleted successfully from the memory location or it will display "Error" if AT command is not executed properly or it will display the "Other Error" other types of error in the SIM808 GSM/GPRS/GPS modem. 

Now, delete any SMS stored in the SIM808 GSM/GPRS/GPS modem.

Softwares Required

Hardwares Required

Name Quantity
AVR Trainer Board-100 with ATmega32 1pc
AVR USB Programmer 1pc
SIM808 GSM/GPRS/GPS Modem 1pc
RG1602A 16X2 Alphanumeric LCD Green 1pc
12V, 2A SMPS Adaptor 1pc
10 to 10 FRC Female to Female Connector 2pc
1 to 1 Connector-Female to Female 5pc

Circuit Diagram



Deleting SMS from SIM808 GSM/GPRS/GPS Modem with ATmega32
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