MOBILE OPERATED SPY ROBOT

Project By:1. Kevin Nesamani2. Sourabh Mokashi3. Nikhil Mashke

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

Introduction

BLOCK DIAGRAMRF

Transmitter RF Receiver

The DTMF technique outputs distinct representation of 12 common alphanumeric characters (0-9, *, #) on the telephone. The lowest frequency used is 697Hz and the highest frequency used is 1633Hz.

The DTMF keypad is arranged such that each row will have its own unique tone frequency and also each column will have its own unique tone frequency.

DTMF TONE

By pressing a key, for example 5, will generate a dual tone consisting of 770 Hz for the low group and 1336 Hz for the high group.

DTMF TONE

DTMF keypads are employed in almost all landline and mobile handsets. Thus this technology is used in the telephone switching centers to identify the number dialed by the caller.

The decoder distinguishes the DTMF tones and produces the binary sequence equivalent to key pressed in a DTMF (Dual Tone Multi Frequency) keypad.

The circuit uses M-8870 DTMF decoder IC which decodes tone generated by the keypad of cell phone.

The signals from the microphone wire are processed by the DTMF decoder IC which generates an equivalent binary sequence as a parallel output like Q1, Q2, Q3, and Q4.

DTMF DECODER

Microcontroller AT89C51 LCD 16x2 Wireless Camera DC Motors Stepper Motor Battery Resistors Diodes DTMF decoder IC 8870 Motor driver IC L293D Crystal 11.0592 MHz ,3.57 MHz

COMPONENTS USED FOR DESIRED RESULT 

ItemCost(Rs.) PCM Manufacturing cost 700 Wireless Camera 1700 Battery [12V 1.3 A] 800 Discrete components 600 DC geared motors [4 nos.] 800 Chasis [Metal or wooden] 1000 Mobile phone 900 LCD 400 Stepper Motor 300 Miscellaneous 500

Total: 7,700.00

Price List [Tentetive]

Wireless control

Surveillance System.

Takes in use of the mobile technology which is almost available everywhere.

This wireless device has no boundry of range and can be controlled as far as network of cell phone

Advantages

Cell phone bill.

Mobile batteries drain out early so charging problem.

Not flexible with all cell phones as only a particular cell phone whose earpiece is attached can only be used.

Disadvantages

Scientific

Industrial Applications

Military and Law Enforcement

Spying and Security

Search and Rescue

Recreation and Hobby

Applications

  http://www.8051projects.info/  http://www.instructables.com/

The 8051 Microcontroller and Embedded Systems – Mazidi. Schenker, L (1960), "Pushbutton Calling with a Two-Group Voice-Frequency

Code", The Bell system technical journal 39 (1): 235–255, ISSN 0005-8580  “DTMF Tester” , ‘Electronics For You’ Magazine , Edition (June 2003)  http://www.alldatasheet.com/ 

Reference

Thank You…