A new wireless asynchronous data communications module for industrial applications

Date
2013
Authors
Ege, Y.
Şensoy, M.G.
Kalender O.
Nazlibilek, S.
Çitak H.
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Supervisor
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Co-Supervisor
Instructor
Source Title
Measurement: Journal of the International Measurement Confederation
Print ISSN
0263-2241
Electronic ISSN
Publisher
Volume
46
Issue
8
Pages
2672 - 2681
Language
English
Type
Article
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Abstract

All the sensors such as temperature, humidity, and pressure used in industry provide analog outputs as inputs for their control units. Wireless transmission of the data has advantages on wired transmission such as USB port, parallel port and serial port and therefore has great importance for industrial applications. In this work, a new wireless asynchronous data communications module has been developed to send the earth magnetic field data around a ferromagnetic material detected by a KMZ51 AMR sensor. The transmitter module transmits the analog data obtained from a source to a computer environment where they are stored and then presented in a graphical form. In this design, an amplitude shift keying (ASK) transceiver working at the frequency of 433.92 MHz which is a frequency inside the so called Industrial Scientific Medical band (ISM band) used for wireless communications. The analog data first fed into a 10-bit ADC controlled by a PIC microcontroller and then the digital data is sent to the transmitter. A preamble bit string is added in front of the data bits and another bit string for achieving synchronization and determination the start of the data is used. The data arriving at the receiver is taken by the microcontroller and sent to a LCD display as well as the serial port of a computer where it is written in a text file. A Visual Basic based graphics interface is designed to receive, store and present the data in the form of graphical shapes. In the paper, all the work has been explained in detail. © 2013 Published by Elsevier Ltd. All rights reserved.

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Keywords
Analog data, ASK, Asynchronous communications, Microcontroller, Serial port, Amplitude shift keying, Analog data, ASK, Asynchronous communication, Industrial-scientific-medical bands, Serial port, Wireless communications, Wireless transmissions, Controllers, Convolutional codes, Geomagnetism, Humidity control, Industrial applications, Liquid crystal displays, Microcontrollers, Sensors, Wireless telecommunication systems, Interfaces (computer)
Citation
Published Version (Please cite this version)