Cellphone Controlled Robot

7/28/2019 Cellphone Controlled Robot

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Submitted By:Akansha JaiswalAvni Rajpal

Harshita Jain



Autonomous mobile robotics - a fascinatingresearch topic :

Sense physical properties of the environmentthrough its sensors into an intelligent agent

Able to identify features, detect patterns andregularities,

Learn from experience

Build maps to navigate and

Find the simultaneous application of many researchdisciplines



Dial Pulse

DTMF

TECHNOLOGY USED



d

The contemporary keypad is laid out in a 3×4 grid.

The original DTMF keypad ,however, has an additional column formenu selector keys.

Pressing a single key will produce a pitch consisting of twosimultaneous pure tone sinusoidal frequencies.

The row in which the key appears determines the low frequency, andthe column determines the high frequency.

For example, pressing the '1' key will result in a sound composed of both a 697 and a 1209 hertz (Hz) tone.

The multiple tones are the reason for calling the system

multifrequency. These tones are then decoded by the switching center to determine

which key was pressed.



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 (DTMF). Robot receives

this DTMF tone with the help of phone stacked in the robot,The received tone is processed by the microcontroller with the helpof DTMF decoder . The decoder decodes the DTMF tone in to itsequivalent binary digit and this binary number is sent to themicrocontroller,

The microcontroller is preprogrammed to take a decision for anygive input and outputs its decision to motor drivers in order to drivethe motors for forward or backward motion or a turn.The construction of receiver and transmitter units are not required.



1. The controller board (Brain)

Built around the popular Atmel AVRmicrocontroller Atmega 8 4 channels of motor controller Board,capable of driving 2 dc motorOn board power regulator ICOn board power supply socket

LEDs(Light Emitting Diodes) fordisplay Atmega 8 Microcontroller

2) Programmer:

USB PoweredSupports almost all AVR seriesmicrocontrollersUSB cableISP Connector

3.Motors:

2 dc geared motors with metal gears

1 castor wheel2 Wheels with rubber grip

4) Sensors:

2 IR sensors

5)Power Supply:

Two 9V Radio Battery



Motors are the output devices that are used to provide motion to the robot.

In our project we are using dc geared motor.

When we apply Vs(+ve voltage) to terminal1 and ground to terminal2 themotor rotates in one directions

and if we apply ground to terminal1 and Vs to terminal2 it rotates inopposite direction.

The function of gears is to increase the torque and reduce the speed.



A DC geared motor usually draws current more than themaximum value per pin of the Microcontrollers.

Thus if we connect it directly to the microcontroller ,itwill be damaged.

So some kind of driver is needed in between. The driver to be used depends on whether we want

unidirectional motion or bidirectional motion.



AVR stands for Advanced Virtual RISC. RISC meansreduced instruction set computer.

Another is a CISC architecture which stands for complex

instruction set computer. In RISC there are small number of simple instructions

only that can be executed within a single clock cyclewhereas

In CISC there are large number of complex instructionsthat generally take more than one clock cycle.

Microcontroller in this family may be 8bit or 16 bit



It is a microcontroller of AVR family with

• 8 KB of flash memory

The flash memory is used to store the program that provides theintelligence to the system.

• 512 bytes EEPROMEEPROM is used to store the data values that may need to be changed

by the program written by us but we want that to be storedpermanently.

• 1 KB of internal SRAMInternal SRAM is used to store the values of various variables that are

not required to be stored

permanently.



• Two 8 bit timer/counters • One 16 bit timer/counter

• 6 built in ADC’s

• Internal calibrated crystal oscillator(1,2,4 and 8 MHz)

• Programmable serial USART etc.



#define F_CPU 8000000UL

#include <avr/io.h>

int main() {

int DTMF;

DDRB=0b11111111;

DDRC=0b0000000; while(1)

{



1) Scientific

Remote control vehicles have various scientific uses including

hazardous environments, working in the deep ocean , and space

exploration. The majority of the probes to the other planets in

our solar system have been remote control vehicles, although

some of the more recent ones were partially autonomous. The

sophistication of these devices has fueled greater debate on the

need for manned spaceflight and exploration.

2)Military and Law Enforcement Military usage of remotely controlled military vehicles dates back

to the first half of 20th century. Soviet Red Army used remotely

controlled Teletanks during 1930s in the Winter War and early

stage of World War II.



3) Search and Rescue

UAVs will likely play an increased role in search and rescue in

the United States. This was demonstrated by the successful use

of UAVs during the 2008 hurricanes that struck Louisiana andTexas.



4)Recreation and Hobby

Small scale remote control vehicles have long been

popular among hobbyists. These remote controlledvehicles span a wide range in terms of price andsophistication. There are many types of radiocontrolled vehicles. These include on-road cars, off-road trucks, boats, airplanes, and even helicopters.

The "robots" now popular in television shows such asRobot Wars, are a recent extension of this hobby(these vehicles do not meet the classical definition of arobot; they are remotely controlled by a human).



Wireless control

Surveillance System.

Vehicle Navigation with use of 3G technology.

Takes in use of the mobile technology whichis almost available everywhere.

This wireless device has no boundation of

range and can be controlled as far as networkof cell phone



Cost of project if Cell phone cost included.

Not flexible with all cell phones as only a

particular ,cell phone whose earpiece is attachedcan only be used.



1. IR Sensors:IR sensors can be used to automatically detect & avoid

obstacles if the robot goes beyond line of sight. This avoidsdamage to the vehicle if we are maneuvering it from adistant place.

2. Password Protection:Project can be modified in order to password protect the

robot so that it can be operated only if correct password is

entered. Either cell phone should be password protectedor necessary modification should be made in the assemblylanguage code. This introduces conditioned access &increases security to a great extent.



3. Alarm Phone Dialer:

By replacing DTMF Decoder IC CM8870 by a 'DTMF

Transceiver IC’ CM8880, DTMF tones can be generated from

the robot. So, a project called 'Alarm Phone Dialer' can be built

which will generate necessary alarms for something that is

desired to be monitored (usually by triggering a relay). For

example, a high water alarm, low temperature alarm, opening

of back window, garage door, etc.

When the system is activated it will call a number of

programmed numbers to let the user know the alarm has been

activated. This would be great to get alerts of alarm conditions

from home when user is at work.

4. Adding a Camera:

If the current project is interfaced with a camera (e.g. a

Webcam) robot can be driven beyond line-of-sight & range

becomes practically unlimited as GSM networks have a very

large range.



1. Wikipedia - The free encyclopedia

2. http://www.8051projects.info/

3. http://www.instructables.com/

4. Schenker, L (1960), "Pushbutton Calling with a Two-Group Voice-Frequency

Code", The Bell system technical journal 39 (1): 235–255, ISSN 0005-8580

5. “DTMF Tester” , ‘Electronics For You’ Magazine , Edition (June 2003)

6. http://www.alldatasheet.com/

7. http://www.datasheet4u.com/35

8. http://www.datasheetcatalog.com/

Cellphone Controlled Robot

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