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Content available Improved performance of Wi-Fi based communication with multiple sensors through collaboration between the WebSerial remote serial monitor and ESP-NOW protocol
Abotaleb Mostafa
Scientific Journal of Gdynia Maritime University
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2023
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nr 127
42--56
EN
This article is a continuation of the research conducted in [Abotaleb 2023] to analyse the importance of coexistence between different wireless technologies in the instrumentation field. The WebSerial based laboratory stand described in [Abotaleb 2023] showed a limited range of WiFi communication due to decreased Received Signal Strength Indicator (RSSI) levels at points not located at a straight Line of Sight (LOS) from the host controller. The ESP32 controller is the backbone of such a stand, administrating both serial and Wi-Fi communication to send the collected data from multiple sensors to the host controller. In order to increase the range of wireless communication, the WiFi based ESP-NOW protocol will be presented as an alternative to performing such a task from the perspective of possible future application in maritime engineering.
2
Content available Authenticated WiFi-based wireless data transmission from multiple sensors through a laboratory stand based on collaboration between ATMEGA2560 and ESP32 microcontrollers
Abotaleb Mostafa
Scientific Journal of Gdynia Maritime University
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2023
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nr 127
27--41
EN
The use of wireless technology in the field of instrumentation is rapidly expanding due to many reasons such as lower installation and commissioning cost than those incurred by wired technologies and a higher level of security provided by authenticated encrypted data transaction, in addition to a decreased level of system complicity, manifested in eliminating or limiting the need for cabling or its accessories. This article will discuss a proposed technique to perform authenticated wireless WiFi data transmission from multiple sensors to the control station depending on a laboratory stand for the purpose of analysing the principle of coexistence between wireless technologies dedicated to industrial automation, such as wireless HART, and general purpose technologies, such as WiFi and Bluetooth Low Energy BLE.
3
Content available Simulation of foundation fieldbus Manchester coded 31.25 kbps H1 bus using MATLAB and Simulink
Abotaleb Mostafa, Mindykowski Janusz, Dudojć Bolesław, Maśnicki Romuald
Scientific Journal of Gdynia Maritime University
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2022
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nr 123
18--31
EN
The purpose of this article is to provide an understanding of possible techniques through which a H1 31.25 kbps Foundation Fieldbus Manchester coded signal can be modulated or demodulated. This understanding will be rendered through MATLAB and SIMULINK models, simulating both ideal and practical as well as noiseless and noisy conditions during the modulation/demodulation process. The simulation models will differentiate between the modulation methods adopted to generate ideal rectangular as well as practical trapezoidal waveforms for the Manchester coded signal. The analysis of the simulation results will describe the mechanisms through which distortion induced by additive white Gaussian noise can be eliminated during the demodulation process either by using recursive filters, such as a Kalman filter, or by calculating wave energy levels in specific time intervals.
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