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SIM Card Presence Detection in SIM808 GSM/GPRS/GPS Modem with ATmega32

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In this project, we will learn SIM Card Presence Detection in SIM808 GSM/GPRS/GPS Modem with AVR ATmega32 Microcontroller. Here, we will check whether a SIM card is inserted in the SIM tray of SIM808 GSM/GPRS/GPS modem  or not with ATmega32 microcontroller and we will display the SIM status in a 16X2 alphanumeric LCD.

The SIM808 GSM/GPRS/GPS modem sends some modem and SIM status data when the GSM/GPRS modem is turned on.  From this modem status data, we can know in which mode the SIM808 GSM/GPRS/GPS modem will operate:- Minimum Fincationality Mode, Full Funcationality Mode or Aeroplane Mode. And whether the SIM808 GSM/GPRS/GPS modem is ready for call/SMS/GPRS operation or not. By default, the SIM808 GSM/GPRS/GPS modem operates in Full Funtionality mode. From the SIM status data, we can know whether SIM card is present or not and if SIM card is present, then whether it needs any password(SIM PIN, SIM PUK and others ) or not. The communication between SIM808 GSM/GPRS/GPS modem and ATmega32 microcontroller takes place through USART communication protocol.  Now, when the SIM808 GSM/GPRS/GPS modem 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 "SIM is Absent" is displayed, if SIM card is present and modem is ready, then "SIM is Present" is displayed and for other conditions, "SIM900 Error" is displayed in the alphanumeric LCD.

Now, check the status message in the 16X2 alphanumeric LCD with and without SIM card in the SIM tray of 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

Video

Downloads

SIM Card Presence Detection in SIM808 GSM/GPRS/GPS Modem with ATmega32
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