Sending SMS from SIM808 GSM/GPRS/GPS Modem with ATmega32
In this project, we will learn Sending SMS from SIM808 GSM/GPRS/GPS Modem with AVR ATmega32 Microcontroller. Here, we will send a text message(SMS) to a mobile number from the SIM808 GSM/GPRS/GPS modem with ATmega32 microcontroller and we will display the status of the SMS sending 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+CMGS" AT command( AT+CMGS command is used to send SMS to a number) with the mobile number and message 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 sending in the alphanumeric LCD. The alphanumeric LCD will display "SMS Sent" if SIM808 GSM/GPRS/GPS modem sends the SMS to the mobile number or it will display "Error" if AT command is not executed properly or "Other Error" for other types of error in the SIM808 GSM/GPRS/GPS modem.
Now, send your 1st text message(SMS) from the SIM808 GSM/GPRS/GPS modem and see whethet it is delivered to the destination mobile number or not.