Abstract:
This project entitled Remote Control Through Internet allows us to monitor, control and automate our home from remote locations. In existing system home automation and security are separate systems working independently. Also in existing system if any one of the sensors goes abnormal the user is not immediately informed about the status, since there is no way for the user to get the information about the status. Monitoring system should be always in online so it is more expensive. Limited to smaller distance i.e., within a single network.

This project integrates automation and security into a single unit. Also abnormal condition of any sensor is detected immediately and message is given as an alert to the user PC. Monitoring and controlling home environment in real time is made possible through LAN.
In This project we use a microcontroller(89S52) which controls the electronic devices through the relay driver(ULN2003). Also we are using PC, which is used for monitoring purpose. The temperature sensor(DS18S20) senses the temperature. Based on the temperature, the microcontroller produces the desired output. Thus our project helps us in constant touch with our home environment ensuring the safety of our home

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INTRODUCTION-:
This project entitled Remote Control through Internet allows us to monitor, control and automate our home from remote locations. In existing system home automation and security are separate systems working independently. Also in existing system if any one of the sensors goes abnormal the user is not immediately informed about the status, since there is no way for the user to get the information about the status. Monitoring system should be always in online so it is more expensive. Limited to smaller distance i.e., within a single network.
This project integrates automation and security into a single unit. Also abnormal condition of any sensor is detected immediately and message is given as an alert to the user PC. Monitoring and controlling home environment in real time is made possible through LAN.
In This project we use a microcontroller (89S52) which controls the electronic devices through the relay driver (ULN2003). Also we are using PC, which is used for monitoring purpose. The temperature sensor (DS18S20) senses the temperature. Based on the temperature, the microcontroller produces the desired output. Thus our project helps us in constant touch with our home environment ensuring the safety of our home
A BRIEF INTRODUCTION TO 8051 MICROCONTROLLER-:
When we have to learn about a new computer we have to familiarize about the machine capability we are using, and we can do it by studying the internal hardware design (devices architecture), and also to know about the size, number and the size of the registers.
A microcontroller is a single chip that contains the processor (the CPU), non-volatile memory for the program (ROM or flash), volatile memory for input and output (RAM), a clock and an I/O control unit. Also called a "computer on a chip," billions of microcontroller units (MCUs) are embedded each year in a myriad of products from toys to appliances to automobiles. For example, a single vehicle can use 70 or more microcontrollers. The following picture describes a general block diagram of microcontroller.
AT89S52: The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller, which provides a highly flexible and cost-effective solution to many, embedded control applications. The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM con-tents but freezes the oscillator, disabling all other chip functions until the next interrupt
The hardware is driven by a set of program instructions, or software. Once familiar with hardware and software, the user can then apply the microcontroller to the problems easily.
The pin diagram of the 8051 shows all of the input/output pins unique to microcontrollers:
The following are some of the capabilities of 8051 microcontroller.
 Internal ROM and RAM
 I/O ports with programmable pins
 Timers and counters
 Serial data communication
The 8051 architecture consists of these specific features:
 16 bit PC &data pointer (DPTR)
 8 bit program status word (PSW)
 8 bit stack pointer (SP)
 Internal ROM 4k
 Internal RAM of 128 bytes.
 4 register banks, each containing 8 registers
 80 bits of general purpose data memory
 32 input/output pins arranged as four 8 bit ports: P0-P3
 Two 16 bit timer/counters: T0-T1Two external and three internal interrupt sources Oscillator and clock circuits.