Real time embedded systems are time-critical systems that are hard to implement as compared to traditional software, due to large numbers of conflicting requirements. This project describes an application of advance modeling techniques to improve the development of embedded systems. In our project we are going to explain one of the most successful applications of a robot called the Tele-operated intelligent mobile robot in which a couple of mobile phones are connected and used as the transmitting and reception media. The main objective of the project is to develop the robot using embedded technology to reduce the complexity in design and control the movement of robot using cell phone.
This is implemented using DTMF technology. A cell phone is connected to the robot. When a call is made from another cell phone to the one attached to the robot, automatically the call gets lifted and the robot starts acting according to the commands given by the caller. The microcontroller is interfaced with dc motors through the line driver.
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 pin out. 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. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes.
[...] XTAL2: Output from the inverting oscillator amplifier INTERRUPTS The AT89S52 has a total of six interrupt vectors: two external interrupts (INT0 and INT1), three timer interrupts (Timers and and the serial port interrupt. Each of these interrupt sources can be individually enabled or disabled by setting or clearing a bit in Special Function Register IE. IE also contains a global disable bit, EA, which disables all interrupts at once. Timer 2 interrupt is generated by the logical OR of bits TF2 and EXF2 in register T2CON. [...]
[...] The operation of a DC motor is dependent on the workings of the poles of the stator with a part of the rotor, or armature. The stator contains an even number of poles of alternating magnetic polarity, each pole consisting of an electromagnet formed from a pole winding wrapped around a pole core. When a DC current flows through the winding, a magnetic field is formed. At its center is the rotor, a coil wound around an iron armature, which spins within the poles of the magnet that can be seen on the inside of the casing. [...]
[...] For longer distances maybe you can add a pair of walkie-talkies, generating audible tones into one, and decoding with the other. Another possibility is to use infrared (IR). Since tones are just electrical pulses, you can replace the speaker with an IR emitter and add an IR detector to the decoder. Yet another experiment is to interface either the generator or the emitter or both to a PC or embedded microprocessor (e.g PIC or Stamp). In this scenario, the PC or a peripheral, through touch-tones, can respond and control. [...]
[...] To eliminate the possibility of an unexpected write to a port pin when Idle is terminated by reset, the instruction following the one that invokes Idle should not be one that writes to a port pin or to external memory. Power-down Mode In the Power-down mode, the oscillator is stopped, and the instruction that invokes Power-down is the last instruction executed. The on-chip RAM and Special Function Registers retain their values until the Power-down mode is terminated. Exit from Power-down mode can be initiated either by a hardware reset or by an enabled external interrupt. [...]
[...] Assembler controls direct the operation of the assembler when generating a listing file or object file. Typically, controls do not impact the code that is generated by the assembler. Controls can be specified on the command line or within an assembler source file LANGUAGE EXTENSIONS Several new variants of the 8051 extend the code and/or xdata space of the classic 8051 with address extension registers. The following table shows the memory classes used for programming the extended 8051 devices. These memory classes are available for classic 8051 devices when you are using memory banking with the LX51 linker/locater. [...]
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