  In recent times, developments in field of communication and robotics has
progressed with leaps and bounds. In addition, the blend of both disciplines
has contributed heavily in making human life easier and better. So in this work
while making use of both the aforementioned technologies, a procedure for
design and implementation of a mobile operated mechanical arm is proposed, that
is, the proposed arm will be operated via a cellular device that connects with
the receiver mounted on the robotic arm. Moreover, over the duration of a call,
if any key is pressed from the cellular device than an indicator indistinct to
the key pressed is noticed at the receiver side. This tone represents
superimposition of two distinct frequencies and referred to as DTMF (dual tone
multi-frequency). Further, the mechanical arm is handled via the DTMF tone.
Also, the acquired tone at the receiver is taken into a micro-controller
(ATMEGA16) using the DTMF decipher module i.e. MT8870. Further, the decipher
module unwinds the DTMF signal into its corresponding two bit representation
and then the matched number is transmitted to the micro-controller. The
micro-controller is programmed to take an action based on the decoded value.
Further, the micro-controller forwards control signals to the motor driver unit
to move the arm in forward/backward or multi-directional course. Lastly, the
mechanical arm is capable of picking and placing objects while being controlled
wirelessly over GSM (Global System for Mobile Communications).
