A Smart Handheld Measuring and Testing Electronic Device with Touch Screen

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INTERNATIONAL JOURNAL FOR TRENDS IN ENGINEERING & TECHNOLOGY VOLUME 5 ISSUE 2 – MAY 2015 - ISSN: 2349 - 9303

A Smart Handheld Measuring and Testing Electronic Device with Touch Screen K.KrishnaPriya, M.Nivetha, M.Precilla Priyadharsini,

Ms.J.Rajeswari,M.E, Assistant Professor, Electrical and Electronics Engineering, Velammal College of Engineering and Technology, Madurai, Tamil Nadu Mail ID: j.rajeswari@vcet.ac.in

B.E, Electrical and Electronics Engineering, Velammal College of Engineering and Technology, Madurai, Tamil Nadu Mail.ID: kkpriya10@gmail.com

Abstract-Hand in hand instrument replaces the old traditional way of measuring and testing in colleges and helps in easy way of understanding theoretical concepts based on practical knowledge. As there occurs shortage of instruments, long duration of calculation, large occupation of space, low accuracy, inconvenience come about in completing the work. A single Smart device which is a multipurpose handheld instrument overcomes the above difficulties and helps in measuring voltage, current, resistance, frequency, temperature, speed, sound and to observe waveforms for engineering students in the laboratories. In a single ARM Cortex M3 microcontroller all measurements are done and displayed within a fraction of time in the TFT graphical LCD display. The data and waveforms from oscilloscope can be saved and retrieved for future analyzing purpose which is done using a Micro SD memory card. The device is fully operated with touch screen and touch buttons. The device works with help of LPC1313, a powerful 32-bit ARM Cortex-M3 microcontroller from NXP Semiconductors. Index Terms: LPC1313, ARM Cortex M3 microcontroller, NXP Semiconductor, Smart device.

———————————————————— 1 INTRODUCTION An efficient multipurpose instrument is introduced to measure and test electrical parameters and the output waveforms of power electronics laboratoryexperiments for easy access, accurate and reliable purpose.The project deals with a smart portable handheld device. The USB-UART device is used to have USB connectivity for viewing of results and other measured values.

Hence, by interfacing all the above devices testing and measuring of required electrical parameters can be done in a single instrument using touch screen and touch buttons.

2 SYSTEMDESCRIPTIONS

1.1Proposed System The following are the features to be done: Voltmeter Ammeter Ohmmeter Tachometer Audiometer Logic Analyzer 3-axis motion monitor Light Meter Temperature Probe Calculator

The system consists of several sensors, touch screen, LCD TFT display and USB-UART which are interfaced into a single ARM Cortex M3 microcontroller. The block diagram of this multipurpose handheld device with touch screen is shown in fig, 1.1.

2.1 ARM Cortex M-3 The Cortex-M3 processor, based on the ARMv7-M architecture, has a hierarchical structure. It integrates the central processor core, called the CM3Core, with advanced system peripherals to enable integrated capabilities like interrupt control, memory protection and system debug and trace. These peripherals are

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