CellPhone-oPeRated
land RoveR
Conventionally, wireless-controlled robots use RF circuits,
due to which they have the drawbacks of limited working range, limited frequency range and limited control. robust control, longer working range can be achieved with it.

Project overview
Here, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. When the call is on any button is pressed, a DTMF tone corresponding to the button pressed is heard at the other end of the call. There is a phone attached to the robot.The received tone is processed by the ATmega16 microcontroller with the help of DTMF decoder MT8870. The DTMF tone is conerted into its equivalent binary digit.The program in the microcontroller takes the action according to the binary digit. The mobi le thatmakes a call to the mo-
bile phone stacked in the robot acts as a remote and hence there is no need for reciever.

Circuit description
The main components of the project are:
-a DTMF decoder,
-microcontroller
-motor driver.

DTMF decoder
An MT8870 series DTMF decoder is used here.Using it, all the all the 16 DTMF tone pairs can be decoded into a 4-bit code output. The
built-in dial tone rejection circuit elimi-
nates the need for pre-filtering.

The ATmega16 microcontroller
It is a low-power, 8-bit, CMOS microcontroller based on the AVR enhanced RISC architecture. It has 16 kB of in system programmable Flash pro-
gram memory. 512 bytes of EEPROM, 1kB
SRAM, 32 general-purpose I/O lines. The output port of atmega16 is fed to the motor driver IC.


The L293D motor driver
It is a quad, highcurrent, half-H driver designed to provide bidirectional drive currents of up to 600 mA at voltages from 4.5V to 36V.

Full report can be downloaded from:
http://kitsnsparesadmin/pdffiles/Cellphone_Land%20Rover.pdf
http://raghueee.110mbDocuments/MobilePho...cument.pdf