Author Topic: Mobile Controlled Robots for Regulating DC Motors and their Domestic Application  (Read 4168 times)

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Author : Suman Khakurel, Ajay Kumar Ojha, Sumeet Shrestha, Rasika N. Dhavse
International Journal of Scientific & Engineering Research, Volume 1, Issue 3, December-2010
ISSN 2229-5518
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Abstract— Robotics and automation engrosses designing and implementation of prodigious machines which has the potential to do work too tedious, too precise, and too dangerous for human to perform. It also pushes the boundary on the level of intelligence and competence for many forms of autonomous, semi- autonomous and tele-operated machines. Intelligent machines have assorted applications in medicine, defence, space, under water exploration, disaster relief, manufacture, assembly, home automation and entertainment. Prime motive behind this project is to design and implement in hardware, a mobile controlled robotic system for maneuvering DC motors and remotely controlling the electric appliances. Mobile platform is to be in the form of a robot capable of standard locomotion in all directions. The robot can be operated in two ways; either by a call made to the mobile phone mounted on the robot or by communication with a computer through a wireless module. Signals from the receiver mobile phone are transformed into digital outputs with the assistance of a decoder. Microcontroller processes these decoded outputs and generates required signal to drive the DC motors. Outputs from the microcontroller are processed by the motor driver to get sufficient current for smooth driving of DC motors and electronic equipments. Consequently, motion of the robot can be regulated and the electric appliances can be controlled from a remote locality. Various levels of automation can be attributed to the robot by suitably modifying the programme loaded on the microcontroller chip.

The robot, integrated with a mobile phone, forms the crux of this project. This integrated architecture is controlled by a supplementary mobile phone, which initiates the call. Once the call is associated, any button pressed corresponds to a unique tone at the other end. The tone is termed as ‘Dual Tone Multiple Frequency’ (DTMF), which is perceived by the robot with the help of a cellular phone stacked in it. The received tone is fed into the DTMF decoder (CM8870), which decodes the DTMF tone into its equivalent binary. Binary output from the decoder is consequently administered by the microcon-troller (P89C61X2). P89C61X2 is pre-programmed to take necessary decisions corresponding to the given set of binary inputs. Output from P89C61X2 is provided to the drivers L293D and ULN2003. The former of which acts as a regulator to drive the DC motor while; the latter can be provided to drive the electrical appliances.

Cellular phone generating the call acts as a remote control obviating the need for construction of superfluous receiver and transmitter units and thus can be used for tele-control of electronic appliances. Similar work has been done by Mr. D. Manojkumar and his project group taking industrial application into consideration. However, this project focuses on the tele/remote control of the electronic appliances and provides the detailed analysis of the methodology, components, algortihm used and the results.

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