Home Automation and Security System via Pstn

Published on May 2016 | Categories: Documents | Downloads: 31 | Comments: 0 | Views: 266
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A domestic telecommunications network is usually accessed by telephones, private branch exchanges and data arrangements. Completion of the circuit between the call originator and call receiver in a Public Switched Telephone Network (PSTN) requires network signalling in the form of dial pulses or multi frequency tones. The PSTN is composed of telephone exchanges networked together to form a nationwide or worldwide telephone communications system. It is public because the system is available to anyone who can afford the service. All calls are switched, that is, a caller's conversation is broken into pieces and these pieces are sent simultaneously over many connections to reach a receiver at the other end. The individual pieces are 'switched' from one telephone device to another until they reach their final destination at the receiving end. Home automation offers time-saving opportunities that can make your life more organized, more efficient, safer and more fun. Every room of the home probably offers plenty of possibilities for home automation. Home automation systems are available for every income level and lifestyle. The idea was extracted to help persons to automate their home at very low costs from any location just by using telephone line. The main feature of this system is to control the status of home appliances using PSTN. Only authorized users can enter the system and they can change the status of the devices. Every authorized user has got his own pin code to enter into the system. The code is verified by the microcontroller. First the call is picked up by the circuit and then it is connected with the system. If the user presses any key form calling telephone, the Dual Tone Multiple Frequency (DTMF) code is decoded by the DTMF decoder IC and then it passes to the microcontroller which further processes the data and controls the devices according to that user instructions. Providing security is a very important function of this work. As the work consists of two way communication, the system will detect any sort of disturbances in the house and if the system is activated, call will be rung to the number at remote location i.e. to that number which is stored in the system. By using the system, the user gets aware that something is happening in his home.

This home automation and security system is controlled by equipment installed at a customer premises. By programming an in-home device, the user controls the operation of appliances connected to the system. For example, a user can program an in-home device to turn on a light at a specific time. The in-home device can also monitor sensors located throughout the home and can sound an alarm or phone a monitoring agency when the sensors are triggered. SOFTWARE AND HARDWARE TOOLS: Software Tools: 1. Keil compiler 2. Orcad. 3. Proload Hardware Tools: 1. 8051 Microcontroller 2. GSM modem 3. MAX 232 4. Sensors- door, IR, LDR-LED pair, fire sensors 5. Buzzer 6. LCD 7. Loads

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