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BT136 Triac and SIM808 GSM/GPRS/GPS Modem based SMS Controlled Wireless Home Automation System with Status Reply using ATmega16

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In this project, we will learn how to make a BT136 Triac and SIM808 GSM/GPRS/GPS Modem based SMS Controlled Wireless Home Automation System with Status Reply using AVR ATmega16 Microcontroller. Here, we will control home appliances i.e 2 bulbs and 2 fans wirelessly using SIM808 GSM/GPRS/GPS Modem and ATmega16 microcontroller. The home appliances are controlled by sending SMS to the SIM808 GSM/GPRS/GPS Modem of the Home Automation System and the change in status of the home appliances are displayed in a 16X2 alphanumeric LCD. Apart from controlling the home appliances, the current status of all the home appliances can also be inquired at any instant of time by sending a predefined SMS to the SIM808 GSM/GPRS/GPS Modem.

When the SIM808 GSM/GPRS/GPS Modem power is turned on, the ATmega16 microcontroller reads the initial status data sent by the SIM808 GSM/GPRS/GPS Modem through USART protocol. After reading the status data, the ATmega16 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 "SIM800 is Ready" is displayed and for other conditions, "SIM800 Error" is displayed in the alphanumeric LCD.

Now, when the SIM808 GSM/GPRS/GPS Modem is ready, the LCD displays "Send Ctrl SMS:" in 1st row and "All APPli. OFF  " in the 2nd row(As all the appliances are in off state initially). The Home Automation System waits for the control SMS to turn On/Off the home appliances. The control SMS are predefined sets of strings(Message of SMS). The predefined set of strings(Message of SMS) to control the home appliances are shown below:-

Control SMS Home Appliance Status
A1 ON Bulb 1 On
A1 OFF Bulb 1 Off
A12ON Bulb 2 On
A2 OFF Bulb 2 Off
A3 ON Fan 1 On
A3 OFF Fan 1 Off
A4 ON Fan 2 On
A4 OFF Fan 2 Off
ALL ON All Appliances On
ALL OFF All Appliances Off
STATUS All Appliances Status

When the SIM808 GSM/GPRS/GPS Modem receives any SMS, it sends new SMS notification to the ATmega16 microcontroller. The ATmega16 microcontroller reads the new SMS notification and displays "New Ctrl SMS" in the alphanumeric LCD. But if the ATmega16 microcontroller receives some other notification(other then SMS like Call and others), then "Unknown Error" is displayed in the  alphanumeric LCD.  After receiving new SMS notification, the ATmega16 microcontroller will read the SMS from the SIM808 GSM/GPRS/GPS Modem memory. If it reads the SMS successfully, then it will compare the content of the SMS with the predefined set of strings else it will display "Empty location" when the read memory location is empty and "Error" when there is error in reading the SMS. When the control SMS is read successfully, the ATmega16 microcontroller compares the message of the received control SMS with the predefined ones, if received control SMS matches with any of the predefined strings, then the microcontroller sends the required control signal to the BT136 Triac driver to turn On/Off the home appliance and it displays the new status of the home appliance in the alphanumeric LCD. And if the received control SMS matches with the string "STATUS", then the ATmega16 microcontroller reads the current state of all home appliances and sends the AT command to SIM808 GSM/GPRS/GPS Modem to send status SMS bearing the current state of all home appliances as message to the mobile number from where the status query SMS is received. The status of the SMS sending(like SMS Sending, SMS Sent) are also displayed in the alphanumeric LCD. But if the received control SMS does not matches with any of the predefined strings, then "Invalid SMS" is displayed in the alphanumeric LCD.

Now, send different SMS to the SIM808 GSM/GPRS/GPS Modem of the Home Automation System and see the change in state of home appliances and check whether status SMS is sent by the Home Automation System or not.

Softwares Required

Hardwares Required

Name Quantity
AVR Trainer Board-100 with ATmega16 1pc
AVR USB Programmer 1pc
SIM808 GSM/GPRS/GPS Modem 1pc
RG1602A 16X2 Alphanumeric LCD Green 1pc
Quad Triac Driver 1pc
Home Appliance Board 1pc
12V, 2A SMPS Adaptor 1pc
10 to 10 FRC Female to Female Connector 2pc
1 to 1 Connector-Female to Female 11pc

Circuit Diagram

Video

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BT136 Triac and SIM808 GSM/GPRS/GPS Modem based SMS Controlled Wireless Home Automation System with Status Reply using ATmega16
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