In
this project "Cell Phone
Operated Land Rover", 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 DTMF
(dual-tone-multiple-frequency).The robot perceives this DTMF tone with the help
of the phone stacked in the robot. The received tone is processed by the (PIC16F877A) microcontroller with then help of DTMF
decoder. The decoder decodes the DTMF tone into its equivalent binary digit and
this binary number is sent to the microcontroller. The microcontroller
is programmed to take a decision for any given input and outputs its decision
to motor drivers in order to drive the motors in forward direction or backward
direction or turn. The mobile phone that makes a call to mobile phone stacked
in the robot act as a remote.
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