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WIRELESS CONTROL OF APPLIANCES & DEVICES BY MOBILE PHONE THROUGH DTMF TECHNOLOGY

Platform : EMBEDDED

WIRELESS CONTROL OF APPLIANCES & DEVICES BY MOBILE PHONE THROUGH DTMF TECHNOLOGY

  • Introduction & Comparison

 

The True Computer on a Chip is nothing but a Microcontroller. The Design incorporates all of the features found in a microprocessor CPU: ALU, PC, SP, and registers. It also had added the other features needed to make a complete computer: ROM, RAM, parallel I/O, serial I/O, Counters and a clock circuits.

 

 

v        Microprocessors are intended to be general-purpose digital computers whereas microcontrollers are intended to be special-purpose digital controllers.

 

v        Microprocessor contains a CPU, memory-addressing circuits, and interrupt handling circuits. Microcontrollers have these features as well as timers, parallel and serial I/O, and internal RAM and ROM.

 

v        Microcontroller models vary in data size from 4 to 32 bits. Four-bit units are produced in huge volumes for very simple applications, and 8-bit units are the most versatile. Sixteen – and 32-bit units are used in high-speed control and signal processing applications.

 

v        Many models features programmable pins that allow external memory to be added with the loss of I/O capability.

 

 

 

 

 

 

  • Project Module

The project modules are divided in two major types are

ü      Hardware Module

ü      Software Module

Hardware Module

 

The hard ware modules are divided into these categories

  1. a.     LCD interfacing
  2. Keyboard interfacing
  3. Switching circuit interfacing (valve connectivity)
  4. Serial communication interfacing
  5. Designing of the circuits

 

  1.  LCD interfacing

In this module we are going to interface the LAMPEX LCD with Microcontroller (89c52).

  1. Key board interfacing

In this module we are going to interface the Keys with Microcontroller either in Matrix method or ordinary method.

  1. Switching interfacing

The electronic relay switch is used to switching the outputs. From one point to another.

  1. Serial Interfacing

This module is used to communicate with the Computer. Using RXD and TXD pins of the microcontroller to the RXD and TXD of the MAX232 IC. 

These interfacing are with microcontrollers

    

Software Modules

1. Getting knowledge in embedded C

2. Lab works on embedded tools

              Keil mvision Software

              Ride Software

3. Wrighting the coding

  1.                                                                    i.            Initializing the LCD using embedded C
  2.                                                                  ii.            Key scanning functions using embedded C
  3.                                                               iii.            Comparison of the two values i.e. original values and the experimental values
  4.                                                                iv.            Adding the interrupt routines
  5.                                                                  v.            Add relay functions (interfacing valve)
  6.                                                                vi.            Add communication functions
  7. 4.     Experimentation of each modules

We have to testing the above modules with the breadboard.

  1. 5.     Combined circuit diagram

We have to design the combined circuit for our project.

  1. 6.     Testing the combined diagram with breadboard.

We are going to implement the working circuit (combined) in the

GPB.

  1. 7.     Designing and development of the Printed Circuit Board

After getting our final Output from the breadboard, we have to

design the Printed Circuit Board and implementing the same circuit

diagram in the Printed Circuit Board (PCB).

  1. 8.     Testing the Board (PCB)

After implementation of the hardware in the PCB u have to test the

PCB.

 

 

 

  • 8- bit Controller

 

Application volumes for the 8-bit microcontrollers may be as high as the 4-bit models, or they may be very low. Application sophistication can also range from simple application control to high-speed machine control and data collection. For these reasons, the microcontroller vendors have established extensive “families “ of similar models. All features a common language, but differ in the amount of internal ROM, RAM, and other cost-sensitive features. Often the memory can be expanded to include off-chip ROM and RAM; in some cases, the microcontroller has no on-board ROM at all, or the ROM is an electrically reprogrammable read only memory (EPROM). 

 

Manufacture       =       Intel 8051

 

Pins/I/O   =       40/32

 

Counter   =       2

 

RAM                 =       128bytes

 

ROM                 =       4K

Other

 

Features   =       External memory to 128K;Serial Port

 

               The 8051 architecture consists of these specific features

 

ü                  8-bit CPU with registers A (the accumulator) and B.

 

ü                  16-bit Program Counter (PC) and Data Pointer (DPTR).

 

ü                  8-bit Program status word (PSW).

 

ü            8-bit Stack Pointer (SP).

 

ü            4 register banks, each containing 8 registers

 

ü            16 bytes, which may be addressed at the bit level

 

ü                  80-bytes of general – purpose data memory.

 

ü                  32-I/O pins arranged as four 8- bit ports: P0-P3.

 

ü                  Two 16 – bit timer/counters: T0 and T1.

 

ü                  Full duplex serial data receiver/transmitter: SBUF

 

ü                  Control Registers: TCON, TMOD, SCON, PCON, IP and IE.

 

ü                  Two External and three internal interrupt sources.

 

ü                  Oscillator and clock circuits.  

 

  • RTX51/RTX Tiny

 

Another Operating System, from Keil Software, is called RTX. It concentrates on the very small applications like DCX. In addition to the RTX-tiny version, which runs totally in on-chip RAM, there is an RTX51, which more closely resembles DCX, RTX tiny uses no more than 64 bytes of RAM depending on how many of the sixteen possible tasks you use. It has code of only about 800 bytes and has only six system calls. RTX51 is still modest sized, requires, tasks at one time, and includes message passing as well as timing, interrupts, task signaling, and memory pool management. RTX tiny is a “Subset “, supporting only timing, Interrupts, and inter-task signaling, which is enough to build up virtually any application. Both systems will run tasks in round robin fashion, but the RTX51 is similar to DCX in providing priority levels for tasks. RTX51 time-slices equal-priority tasks whereas DCX let equal-priority tasks run to a wait on a first-com/first-served basis.

 

 

 

 

 

 

 

 

 

 

 

Transmitter section:

 

 

 

 

 

 

                                                                                                                                         Antenna

 

 
   

 

 

 

 

 

 

 

 


                

 

 

 

 

Receiver

 

 

 

 

 

 

Antenna

 

 

    

 

 

 

 

 

 

 

 

 

 

 

Synopsis

 

This project allows as to control equipments using RF technology here fm signals are used as controlling media here in this project the user is provided with a handset which consists of a Dtmf generator, a keypad and a fm transmitter to transmit the signals the master unit consists of a fm receiver, a Dtmf to binary converter and a microcontroller for enabling /disabling the device selected in handset, with the use of relays. Thus this simple gadget allows the user to access the home appliances / any electronic appliances wirelessly from any section of the campus. Since the fm waves can travel any where via the buildings /walls and doors, while an IR remote is directional and cant penetrate through walls or doors. The project is also economical and simple to use

In this project we use a 2x2 keypad as a input the keypad has four keys Each named after the device being to be accessed the output of keys is fed to an Dtmf generator chip which is being commonly used in telephones the chip actually converts the key presses into a audio tone as similar while we dial a number in telephone the audio data from the chip is fed to a fm transmitter the frequency of fm transmitter is around 100mhz.

In receiver section the fm receiver demodulates the carrier and retrieves the Dtmf tone the output of chip is fed to Dtmf to binary converter then the data is fed to microcontroller which is programmed to control the appliances with respect to input key pressing.

 Thus the device can drive up to a maximum of 12 devices but for a demo purpose we are providing a control access for 4 devices the device can be used for controlling appliances all over the campus.                

 

 



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