DTMF BASED DC MOTOR CONTROL

INTRODUCTION

Our project is based on DC motor control using DTMF technology. In this project, the motor 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 circuit connected to dc motor. 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 motor. Use of a mobile phone for motor control can overcome limitations which
we faced in rf based technique. It provides the advantage of robust control, working range as large as the coverage area of the service provider, no interference with other controllers and up to twelve controls.
 In this project the motor, is controlled by a mobile phone that makes call to the mobile phone attached to
the circuit 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 tome (DTMF) circuit receives this DTMF tone with the help of phone stacked in the robot.