DTMF Mobile ROBO is a machine that can be controlled with a mobile . 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.

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Robot receives this DTMF tone with the help of phone stacked in the robot. The received tone is processed by the 8051 microcontroller with the help of DTMF decoder MT8870. The decoder decodes the DTMF tone into its equivalent binary digit and this binary number is send to the microcontroller. The microcontroller is pre-programmed to take a decision for any given binary input and outputs its decision to motor drivers in order to drive the motors for forward or backward motion or a turn.The mobile that makes a call to the mobile phone stacked in the robot acts as a remote.

So this simple robotic project does not require the construction of receiver and transmitter units.DTMF signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone dialing is known as touch tone .DTMF assigns a specific frequency (consisting of two separate tones) to each key s that it can easily be identified by the electronic circuit. The signal generated by the DTMF encoder is the direct algebraic submission, in real time of the amplitudes of two sine(cosine) waves of different frequencies, i.e. ,pressing 5 will send a tone made by adding 1336hz and 770hz to the other end of the mobile.

 

Project Report :

Grade Recieved : A+