SUBMITTED BY
B.KARTHIK
CH.NITHIN
P.V.ROHIT

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Abstract:
In this project, we present the controlling of a Robot using DTMF technique .The robot is controlled by a mobile phone that calls the other mobile phone attached to the robot. In the course of the call, if any button is pressed, the tone corresponding to the button pressed is heard at the other end. This tone is called “Dual Tone Multi Frequency tone (DTMF)”.Using DTMF code, direction of motion of the robot can be controlled by mobile phone. The above system can be used for military purpose as ‘bomb detector’ and as ‘spy robot’ and also for surveillance.
Keywords: Mobile phones, DTMF decoder, controller.
This is the block diagram of controlling robot using DTMF.
DTMF TONE:
The DTMF technique outputs distinct representation of 16 common alphanumeric characters (0-9, A-D, *, #) on the telephone. The lowest frequency used is 697Hz and the highest frequency used is 1633Hz.
The DTMF keypad is arranged such that each row will have its own unique tone frequency and also each column will have its own unique tone frequency. Above is a representation of the typical DTWMF keypad and the associated row/column frequencies. By pressing a key, for example 5, will generate a dual tone consisting of 770 Hz for the low group and 1336 Hz for the high group.