Landrover Robot Operated by Cellphone

Description:
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.
The metal detector circuit mounted on the robot detects any metal object around it.

Block Diagram:

Description in detail: On the robot we have mounted a 12V battery as the power supply for the circuit and the motors. When the user calls the mobile which is mounted on the robot the call is received by auto-answer mode. As the call continues when the user presses a button on his handset the tone that is generated is decoded by the DTMF decoder and the command is passed to the microcontroller which is pre-programmed. The Microcontroller then passes the command to the motor driver ICs for motion. The metal detector when detects a metal and turns the buzzer on. Applications: This robot can be used in the borders for disposing hidden land mines. The robot can be used for reconnaissance or surveillance. The robot can be used anywhere there is the service provider tower of the connection provided that is mounted on the robot. The robot is small in size so can be used for spying.