Parag Mehta

I feel that projects are a must for every engineer. The theorotical work will only give you the concepts. However, I feel that there is no point in just storing the concepts in the mind. Only when you put the concepts in practise, it’s actual worth is recognised. Throughout my educational career, I have been involved in varied projects. Following is a short gist of the projects that I have undertaken til now.

Embedded Web server (October 2005 – till date)

Under the guidance of Dr. J.K.Mukherjee, Head, Department of Remote Handling and Robotics, B.A.R.C

The project involves the design of an internet enabled home automation system, with security features such as temperature sensors, motion sensors and intrusion detection systems. A TCP/IP stack, written in C and compiled using Imagecraft’s ICCAVR, has been ported to the ATmega128 microcontroller. Building the web server has involved implementing several protocols like TCP/IP, UDP, ARP and ICMP. The network protocol analyzer, Ethereal is used to view the packets sent out by the web server and for debugging. The internet interface comprises of the microcontroller interfaced to an embedded ethernet board, which utilizes the Crystal LAN8900A chip in 8 bit mode of implementation. The internet interface creates TCP packets and sends it across the internet. The listener program on the web server receives the packet and updates the latest readings on the webpage stored in the flash memory of the AVR. A Visual Basic front end has also been implemented to send data to the remote system using the UDP protocol. I am currently working on controlling a simple robot car interfaced to the AVR I/O ports using the same web browser interface through forms, using CGI programming.

I/O Expansion Board (August 2005 – September 2005)

Carried out at the Department of Remote Handling and Robotics, Bhabha Atomic Research Centre

The project involves the design of an I/O expansion board that offers 16 TTL level digital I/O lines, 12-bit ADC, 12-bit DAC and Quadrature decoder HP 2032 for direct interface to external optical encoders for motion control. The circuit implementation and PCB layout has been carried out using Cadsoft EAGLE. The board will ultimately be used to control a 6 degree of freedom Master-Slave manipulator already developed at B.A.R.C.

Implementation of Wireless LAN (Summer Internship) (June 2005 - July 2005)

Under the guidance of Mr. Shashin Mehra, Kusum Engineering Works

The Project involved the setup of a Wireless LAN system for a departmental site consisting of 25 wired Computers. The primary purpose of the project, developed using the 802.11b protocol was to increase the mobility of work. The first step involved the setup of the fully featured high-end Cisco Aironet 350 Series access point. First up, the access point was connected to the wired hub. Then, the wireless interface and the wired interface were configured. In the end the security was configured. Because of the use of a higher end access point, we were able to turn on the Temporal Key Integrity Protocol (TKIP). Since TKIP offers new encryption algorithms and constantly changes the encryption keys, the overall security of the system increased. The whole setup was completed in a period of about 2 months and is working efficiently without any problems.

Activity Communicator (September 2004 – November 2004)

Under the guidance of Dr. M.S. Agarwal, Professor, Department of Electrical Engineering, IIT, Mumbai

The activity communicator is an attempt at developing a remote monitored, wireless controlled twin axis robotic arm. The system has been implemented using only discrete component such as potentiometers, OP-Amp’s and motors. The X and Y axis rotary potential divider circuits, at the transmitting end, transform the motion of a remote operated shaft into electrical signals which are amplitude modulated and transmitted over a range of 5 meters. The demodulated signals at the receiver are replicated and are used to drive the two dc motors thus replicating the shaft motion. The practical applications of the project include Telerobotic surgery, Distance Education and Repairing of Satellites.

Code Lock Security with Closed Circuit Television (CCTV)

The system is a unique means of providing high level of security and continuous monitoring of people wherever it is implemented. The project involved having a password check security system integrated with close circuit television. The circuitry was implemented using basic electronic devices and is a very basic implementation with a high degree of efficiency. The user needs to be validated in order to gain access to they system which was incorporated through the Code Locking Mechanism.

Line Follower Robot (November 2003 – February 2004)

Under the guidance of Prof Sanjay Deshmukh,
Electronics and Telecommunication Department,DJSCOE

The line tracker was implemented using the H-Bridge (L293D) and an Infra Red sensor array, interfaced to the P89C51RD2 microcontroller. The IR sensor array consisted of 5 IR transmitter/receiver pairs that were matched for performance. The programming was carried out in C using Keil Compiler, implementing pulse width modulation for delivering DC power to the motors. The PCB layout and board designing were carried out using Express PCB. The simple differential steering mechanism enabled robot stood 1st at autonomous task oriented robotic competition at Techtrix, DJSCOE and 2nd at ITW, SNDT University.

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