8051 Microcontroller Based

RF BASED REMOTE CONTROL INTODUCTION- The consider Long Range Remote Control hind end be utilize to remotely operate a number of Electrical or electronic Gadgets connected to it. Unlike Infra Red remote control, this Project employs FM transmitting and Reception, and hence it can be employ for comparatively overnight range. Any gadget can be switched on/off by keying the number al placed to it. The Receiver is made up of the famous 8 snowflake Microcontroller from Atmel. The Microcontroller is subroutined as the Master in the receiver end which is used to control every last(predicate) the spins.It decodes the Signal from the transmitter and control the relays according to the signal. For transmission we be using frequency modulation at the frequency of 433. 92Mhz. A BRIEF INTRODUCTION TO 8051 MICROCONTROLLER- When we have to learn about a new(a) computer we have to familiarize about the machine capability we are using, and we can do it by studying the internal hardware c ast (devices architecture), and to a fault to know about the size, number and the size of the registers.A microcontroller is a mavin snap off that contains the processor (the CPU), non-volatile keeping for the course of instruction (ROM or flash), volatile storage for infix and issue ( random-access memory), a clock and an I/O control unit. Also called a computer on a chip, billions of microcontroller units (MCUs) are implant each year in a myriad of products from toys to appliances to automobiles. For example, a iodin vehicle can use 70 or more microcontrollers. The spare-time activity 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 remembrance. The device is manufactured using Atmels high-density nonvolatile keeping technology and is compatible with the industry-standard 80C51 instruction check and pinout. The on-chip Flash allows t he 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 supple and ost-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 sever 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 boodle the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to insure functioning.The Power-down mode saves the RAM con-tents but freezes the oscillator, disabling all other chip functi ons 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. ? home(a) ROM and RAM ? I/O ports with programmable pins ? Timers and counters ? Serial data communicationThe 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 ? cardinal 16 bit timer/counters T0-T1Two external and three internal interrupt sources Oscillator and clock circuits THEORY- Radio Frequency remote control) A handheld, wireless devic e used to operate audio, video and other electronic equipment using communicate frequency (RF) transmission.Unlike the more common infrared (IR) remotes, RF remotes do not require line of sight and do not have to be aimed at the equipment. In fact, RF remotes can be operated. RF Receivers (Base Stations) be Required Since most equipment is IR based and comes with an IR sensor located on the front panel, the RF must wind up as IR. This is accomplished with an RF receiver, which is a base station and antenna, that accepts RF signals and converts them to IR. For use inside equipment cabi exculpates, the receiver typically has an IR blaster that showers IR signals to all components by reflecting off the closed cabinet door.The RF receiver also has sockets for several IR emitters (IR flashers) that are wired to, and pasted directly over, the IR sensors in the equipment for precise aiming. See IR remote control and RF. References- The 8051 microcontroller and introduce systems using as sembly and C Muhammad Ali Mazidi, Janice Gillespie Mazidi 1. Keil Software, dScope Debugger, http//www. keil. com/ 2. National Instruments Multisim 10. 0 www. ni. com/multisim 3. www. 8051projects. info 4. www. 8051projects. net 5. www. dnatechindia. com 6. AT89c51 datasheet available at www. alldatasheets. com