8051 Microcontroller Based

RF BASED REMOTE CONTROL INTODUCTION- The go for Long Range Remote Control provide be hired to remotely conquer a number of Electrical or Electronic Gadgets connected to it. Unlike Infra Red remote control, this Project employs FM transmission and Reception, and hence it can be used for comparatively longer range. Any gadget can be switched on/off by keying the number all toldocated to it. The Receiver is made up of the famous 8 bit Microcontroller from Atmel. The Microcontroller is used as the Master in the receiver end which is used to control all the devices.It decodes the Signal from the transmitter and control the relays according to the signal. For transmission we are using frequency modulation at the frequency of 433. 92Mhz. A BRIEF knowledgeability 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 t o 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 computer storage for the design (ROM or flash), volatile memory for input and output ( grind away), a clock and an I/O control unit. Also called a computer on a chip, billions of microcontroller units (MCUs) are introduce each year in a myriad of products from toys to appliances to automobiles. For example, a single vehicle can use 70 or to a greater extent microcontrollers. The following picture describes a habitual 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 Atmels 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 no nvolatile 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 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 interrupt architecture, a beat 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 preservation 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 opposite 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 exploiter 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 communicationThe 8051 architecture consists of these specific features ?16 bit PC &data pointer (DPTR) ?8 bit program term 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 THEORY- Radio Frequency remote control) A handheld, wireless device used to operate audio, video and other electronic equ ipment using radio frequency (RF) transmission.Unlike the more common infrared (IR) remotes, RF remotes do non 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) Are Required Since most equipment is IR based and comes with an IR detector 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 cabinets, 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(prenominal) 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 Embedded systems using assemblage and C Muhammad Ali Mazidi, Janice Gillespie Ma zidi 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