P. Eswaran

Design Analysis of MEMS Capacitive Differential Pressure Sensor for Aircraft Altimeter

In this paper, an analytical and simulation solution for Microelectromechanical systems (MEMS) based capacitive differential pressure sensor for aircraft altimeter is proposed. The principle and design of the proposed MEMS capacitive differential pressure sensor design is explained. Centre deflection and capacitive sensitivity analysis is carried out for circular, square and rectangle diaphragm membrane. Numerical analysis and simulation on deflection and capacitive sensitivity is carried out for the range of pressure from 100mbar to1100mbar. Gold, silicon and Liquid crystal polymer (LCP) material are selected as diaphragm membrane. Analysis and simulation result shows, that gold diaphragm membrane was more suitable for aircraft altimeter applications.

Simulation Analysis of MEMS Based Capacitive Differential Pressure Sensor for Aircraft Application

In this paper, simulation solution for Microelectromechanical systems (MEMS) based capacitive differential pressure sensor for aircraft altimeter is proposed. The principle of proposed MEMS capacitive differential pressure sensor design was explained. Analysis for the measurement of center deflection and capacitive sensitivity square diaphragm membrane was done. Simulation on deflection and capacitive sensitivity was carried out for the range of pressure from 100mbar to1100mbar. Gold, diaphragm membrane was used in this analysis. Analysis result shows, linear variation on center deflection and capacitance variation which is more suitable for this application.

Metro overhead tanks monitoring system using ZigBee based WSN

In this paper, metro water overhead tanks monitoring system-using ZigBee based WSN is presented. WSN applications provide ease feasibility on implementation over wired network. The proposed system is used for monitoring the overhead tanks i.e. filling the water tanks or stopping the pumping based on the available water level and monitoring the distribution of water. Prototype remote node was developed to monitor water level and control to the pumping motor. These parameters were communicated to controller node. By using ZigBee based WSN, we can control tanks in wide area using a controller unit.

Design and implementation of deadline based EDF algorithm on ARM LPC2148

This paper presents the implementation of an Earliest Deadline First (EDF) based algorithm to support number of real time applications on a single processor. This algorithm overcomes the limitation of real-time algorithm in tracking the task and provides more controllability and predictability to dynamic algorithm. This algorithm is designed through basic theorem of EDF. The proposed algorithm is simulated for independent, preemptive and periodic tasks. The results obtained from simulation shows, that tracking of task at any desirable time instant is very effective. The same algorithm was implemented on development board MCB2140 and results were verified.

Modeling of MEMS capacitive differential pressure sensor

In this paper, modeling of high sensitive capacitive differential pressure sensor (CDPS) structure was proposed. The-working principle of CDPS was explained. Different types of CDPS structure for aircraft altimeter were designed. Polymide square diaphragm membrane is used to sense the pressure. Simulation was carried out for the range of pressure from 116 mbar to 1100 mbar, which is equivalent to aircraft flying altitude. Analysis was done with simulation results for centre deflection sensitivity and capacitive sensitivity for different models of CDPS structure. From the simulated results an improved CDPS models with bossed diaphragm membrane shows linear characteristics. The deflection sensitivity and capacitive sensitivity are 10.912nm/mbar and 3.025fF/mbar respectively.

Prototype of an underground multi-storied automated car parking system

This work proposes to develop and implement a prototype model of an efficient unmanned car parking system using microcontroller. Model developed for underground car parking with multiple floors, prevents the usage of the parking space at ground level. Entire process was automated so that it reduces the time wasted by a person to park a car. This model uses two circular floors, with six car-parking slots in each floor. This mechanism has centre primary shaft holding a lift to transport the vehicle to its appropriate parking slot. Various sensors, motors and software were used to detect and transport the car to its allocated parking slot. Hence, this system provides a closed loop control, making it an efficient, accurate, secure and a convenient method proposed for parking cars in both commercial and residential areas.

Differential power analysis (DPA) attack on dual field ECC processor for cryptographic applications

Exchange of private information over a public medium must incorporate a method for data protection against unauthorized access. To enhance the data security against the DPA attack in network communication, a dual field ECC processor supporting all finite field operations is proposed. The ECC processor performs hardware designs in terms of functionality, scalability, performance and power consumption. A unified scheme is introduced to accelerate EC arithmetic functions. The hardware is optimized by a very compact Galois field arithmetic unit with fully pipelined technique. A key-blinded technique is designed against power analysis attacks.

Stabilization of UAV Quadcopter

This paper presents the stabilization controller design and implementation of cost-effective UAV (unmanned aerial vehicle) quadcopter which can handle small disturbances and remain stable. PID controller provides stability by controlling the speed of quadcopter. Flight controller is used to control the speed of the propeller and also to monitor the orientation of the craft using accelerometer and gyroscope, and ESC continually adjusts the motor speeds to keep the airframe stable. Algorithm is also developed to control the quadcopter in a fraction of seconds. If the quadcopter deviates from the set position, flight controller automatically controls the quadcopter and maintains stability. Test cases for different tilt angle and manoeuvre along pitch, yaw, and roll were simulated using LabVIEW v11.0.1 environment and PID controller parameters are optimized to have quicker response time. Finally, the developed PID controller algorithm was implemented in the designed quadcopter and tested, which yields the desired performance.

Design and implementation of ASIC for weather monitoring application using FPAA and FPGA

This paper proposes the design of AS IC for weather monitoring application and to implement it using FPAA (Field Programmable Analog Array) and FPGA (Field Programmable Gate Array). Three atmospheric parameters such as temperature, humidity and CO2 are considered for experimentation. Sensor signals are ported to FPAA through input ports for analog signal processing. The serial digital output data from FPAA is fed to custom designed digital processor in FPGA and the real time atmospheric parameters are displayed in LCD display. The simulation results are obtained for the custom designed processor using Xilinx Spartan-3AN tool and design was optimized for better performance. Hardware implementation of the proposed AS IC mixed signal processer uses Anadigm AN231E04 for analog processing and Xilinx Spartan-3AN FPGA for digital processing. The experiment result shows the good circuit integrity and functionality, and also faster computational response.

UWB antenna design

Reduced ground plane UWB antenna with rectangular patch on FR4 substrate is designed and its analysis is presented in this paper. Performance analysis was carried out for return loss, VSWR, radiation characteristics and impedance matching for the resonance frequency of 6.85 GHz. HFSS tool is used for simulation and the result shows multi resonance characteristics with bandwidth of 6.7 GHz in UWB range with VSWR of 1.4. Proposed structure is optimized to yield the impedance of 47.5 Ω. Better results are obtained on compared with the similar results of the previous work.