iosr-JECE   Volume-16 ~ Issue-4 ~ Jul.-Aug. 2021

Abstract: Wide regions around the world specially remote and rural areas suffer from the absence of voice and data services provided by operating service providers in the country or may suffer from weak network coverage due to the small amount or the absence of built infrastructure in these areas, here comes the role of satellite communication systems as a solution for this problem due to their great abilities such as a wide reception range which means the possibility of building networks in almost any place on earth. The purpose of this article is to study VSAT technology and Mobile Satellite Services as satellite based services and comparing their capabilities from different aspects in providing communication services for people in these regions.

Keywords: VSAT, Mobile Satellite Services, VSAT Architecture, MSS systems, Propagation Conditions, Frequency Bands, Antenna Diameter

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[2]. K. Ch. Sri Kavya, S.K.K., G R R N Vardhani, "Rural Tele-Communication Using VSAT Technology: A Review", International Journal of Pure and Applied Mathematics, 2017. 117(18): p. 155-162.
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[4]. Wilk-Jakubowski, J., ''A review on information systems engineering using vsat networks and their development directions'', Yugoslav Journal of Operations Research, 2020(00): p. 15-15.
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Abstract:Background: This work elucidates the simple design method of a low cost multi-scale digital thermometer based on PIC16F77A Microcontroller and temperature sensor LM35. LM35 is an analog sensor that converts the surrounding temperature to a proportional analog voltage. The sensor's output is connected to one of the Analog to Digital Converter (ADC) channel inputs of the Microcontroller to originate the equivalent temperature value in digital format. Ten digital values of temperature are stored and computed within a short duration to have maximum, minimum and average temperatures. Thereafter, the calculated forms of temperature are displayed in a 16×4 character LCD in four different scales correspondingly. Results: This design process is more convenient than others as it is more economical, efficient and straightforward......

Keywords: Microcontroller, Sensor, LCD, Circuit board, Construction and Calibration

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Abstract: For industrial applications such as boilers in nuclear power plants, textile dying machines, etc., water level control is highly important. In this work, a fuzzy logic based simple water level indicator and controller was designed and implemented. For simplicity, the fabricated electronic level indicator defines only two (2) levels; minimum and maximum through use of Light Emitting Diodes (LEDs). The fuzzy logic controller (FLC) was based on Mamdani type Fuzzy Inference System which has two inputs; error in level and rate of change of error with one output; valve position. The fuzzy controller was implemented in MATLAB and then simulated in Simulink to test the behaviour of the.....

Keywords: Fuzzy logic controller, level control, Mamdani, PID controller, Simulink

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[2]. Anyanwu, C. N., Mbajiorgu, C. C., & Anoliefo, E. C. (2012, March). Design and Implementation of a Water Level Controller. Nigerian Journal of Technology (NIJOTECH), 31(1), 89-92.
[3]. Arshdeep, K., & Amrit, K. (2012, May). Comparison of Mamdani-Type and Sugeno-Type Fuzzy Inference Systems for Air Conditioning System. International Journal of Soft Computing and Engineering (IJSCE), 2(2), 323-324.
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[5]. Davood, M. S., Seyed, H. A., & Faridoon, S. (2013, January). Comparative Study between Tank's Water Level Control Using PID and Fuzzy Logic Controller. Advances in Intelligent Systems and Computing (AISC), 195, 141–153. doi:10.1007/978-3-642-33941-7-15