Monday, April 10, 2017

DTMF BASED HOME APPLIANCE

ABSTRACT


Security is prime concern in our day-to-day life. Every one wants to be as much as secure as to be possible. An access control systems forms a vital link in a security chain. The micro controller based digital lock presented here is an access control system that allows only authorized persons to access appliances.This system is best suitable for corporate offices, ATMs and home security. As a simple example, to lock our mobile phone keypad, a security code of at least 4 digits must be entered.

The system comprises a small electronic unit with a mobile keypad, which is fixed to the electronic circuitry .The devices to be controlled will be selected from his hand held mobile. According to the key pressed at the receiver side the corresponding device will be controlled.A DTMF decoder CM8870C which decodes the keypad signals and these signals are given to the microcontroller.

A buzzer is provided for audio acknowledgment of the key impression. Whenever a key is pressed on the numeric key pad from his handheld numeric keypad, the system acknowledges the impression by a short beep sound. This buzzer is driven by an NPN transistor.

The programming language used for developing the software to the microcontroller is Embedded/Assembly. The KEIL cross compiler is used to edit, compile and debug this program. Here in our application we are using AT89C51 microcontroller which is Flash Programmable IC.AT represents the Atmel Corporation represents CMOS technology is used for designing the IC.


HARDWARE COMPONENTS

1. Microcontroller
2. MOBILE
3. Uln2003 driver.
4. POWER SUPPLY.
5. Devices
6. buzzer.
7. 16/2 LCD


SOFTWARE TOOLS

1. EMBEDDED C
2. KEIL compiler
3. PROTEUS

Block Diagram:

mini project
DTMF BASED HOME APPLIANCE

Mobile phone robot

ABSTRACT:

For many people robot is a machine that imitates a human—like the androids in Star Wars, Terminator and Star Trek: The Next Generation. However much these robots capture our imagination, such robots still only inhabit Science Fiction. People still haven't been able to give a robot enough 'common sense' to reliably interact with a dynamic world. The type of robots that you will encounter most frequently are robots that do work that is too dangerous, boring, onerous, or just plain nasty.

In fact, there are over a million of these types of robots working for us today. A study of robotics means that students are actively engaged with all of these disciplines in a deeply problem-posing problem-solving environment.

Our mobile phone robot consists of microcontroller ATMEL AT89C51; a DTMF decoder CM8870C which decodes the keypad signals and these signals are given to the microcontroller which will drive the dc motors using L293D driver. The direction of the robot will be selected by the key press from our handheld mobile phone.

The programming language used for developing the software to the microcontroller is Embedded/Assembly. The KEIL cross compiler is used to edit, compile and debug this program. Here in our application we are using AT89C51 microcontroller which is Flash Programmable IC.AT represents the Atmel Corporation represents CMOS technology is used for designing the IC.

HARDWARE COMPONENTS

1. Micro-controller
2. POWER SUPPLY.
3. dc MOTOR
4. lm293d DRIVER
5. DTMF DECODER

SOFTWARE TOOLS

1. EMBEDDED C
2. KEIL compiler
3. PROTEUS

BLOCK DIAGRAM:


mini project
Mobile phone robot
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