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CAPSTONE PROJECT MOBILE CONTROLLED ROBOT USING DTMF TECHNOLOGY MENTOR NAME: MR. KRISHAN PAL SINGH YADAV SUBMITTED BY: SUBMITTED TO: ASHISH SHARMA KRISHAN PAL SINGH YADAV REG.NO 10801051 SECTION:-E18E2 (ECE)

Mobile Controlled Robot Using Dtmf Technology

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Page 1: Mobile Controlled Robot Using Dtmf Technology

CAPSTONE PROJECT

MOBILE CONTROLLED ROBOT USING DTMF TECHNOLOGY

MENTOR NAME: MR. KRISHAN PAL SINGH YADAV

SUBMITTED BY: SUBMITTED TO:

ASHISH SHARMA KRISHAN PAL SINGH YADAVREG.NO 10801051SECTION:-E18E2(ECE)

Page 2: Mobile Controlled Robot Using Dtmf Technology

Mobile Controlled ROBOT Using DTMF Technology

Introduction

What is a Mobile controlled DTMF ROBOT?

DTMF Mobile ROBO is a machine that can be controlled with a mobile . In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called "Dual Tone Multiple-Frequency" (DTMF) tone. The robot perceives this DTMF tone with the help of the phone stacked on the robot. The received tone is processed by the microcontroller with the help of DTMF decoder. The microcontroller then transmits the signal to the motor driver ICs to operate the motors & our robot starts moving

Why build a DTMF ROBOT?

Conventionally, Wireless-controlled robots use rf circuits, which have the drawbacks of limited working range, limited frequency range and the limited control. Use of a mobile phone for robotic control can overcome these limitations. It provides the advantage of robust control, working range as large as the coverage area of the service provider, no interference with other controllers and up to twelve controlles.

Although the appearance and the capabilities of robots vary vastly, all robots share the feature of a mechanical, movable structure under some form of control. The Control of robot involves three distinct phases: perception, processing and action. Generally, the preceptors are sensors mounted on the robot , processing is done by the on-board microcontroller or processor, and the task is perfomed using motors or with some other actuators.

POJECT OVERVIEW:

In this project the robot, is controlled by a mobile phone that makes call to the mobile phone attached to the robot in the course of the call, if any button is pressed control corresponding to the button pressed is heard at the other end of the call. This tone is called dual tone multi frequency tome (DTMF) robot receives this DTMF tone with the help of phone stacked in the robot

The mobile that makes a call to the mobile phone stacked in the robot acts as a remote.DTMF signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone dialing is known as touch tone .

DTMF assigns a specific frequency (consisting of two separate tones) to each key s that it can easily be identified by the electronic circuit. The signal generated by the DTMF encoder is the direct al-gebric submission, in real time of the amplitudes of two sine(cosine) waves of different frequencies,

Page 3: Mobile Controlled Robot Using Dtmf Technology

i.e. ,pressing 5 will send a tone made by adding 1336hz and 770hz to the other end of the mobile. The tones and assignments in a dtmf system shown below

Figures shows the block diagram and cicuit diagram of the microcontroller- based robot. The important components of this robot are DTMF decoder, Microcontroller and motor driver.

DTMF Decoder

The HT9170 series are dual tone multi frequency receiver .all types of the HT9170 series use digital counting techniques to detect and decode all the 16 DTMF tone pairs into a 4-bit code output a built-in dial tone rejection curcuit is provided to eliminate the need for pre-filtering.when input signals given at vp(1) and vn(2) pins are recognized to be effective, DV(15)

Becames high and the correct 4-bit code tone transfer to the out put pins D0(11)-D3(14).

MICROCONTROLER

FEATURES:

‘AT89C51’It is ATMEL’s product.

It is a similar to 8051 microcontroller i.e. having same instruction set, pin configuration, architecture.

It is a also 8-bit microcontroller. It’s cost is only Rs10 more than 8051.

It uses EPROM (erasable programmable read only memory) or FLASH memory.

It is Multiple time programmable (MTP) i.e. 1000 times. So it is better than 8051.

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In ‘AT89C51’, ‘C’ stands for CMOS technology used in the manufacturing of the I.C.

ATMEL89C52 Description:

The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8K bytes of Flash programmable and erasable read only memory (PEROM). The deviceis manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 and 80C52 instruction set and pinout.

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 Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputer

which provides a highly-flexible and cost-effective solution to many embedded control applications.