Introduction.- Introduction to Green Internet of Things Sensor Networks.- Applications and Communication Technologies in IoT Sensor Networks.- Smart Internet of Things Devices and Applications Specific.- Design of Photovoltaic System for IoT Devices.- Security Challenges in IoT Sensor Networks.- IoT Sensor Networks Security Mechanisms and Techniques.- User Interface Layer.- Future Challenges of IoT Sensor Networks.- Conclusion.

ADAMU M. ZUNGERU received the Ph.D., MSc, and BEng from Nottingham University, Ahmadu Bello University Zaria Nigeria, and Federal University of Technology Minna Nigeria, respectively. He was a Research Fellow at the Massachusetts Institute of Technology (MIT) in the USA, where he also obtained a Postgraduate Teaching Certificate in 2014. He is currently an Associate Professor and the Head of the Department of Electrical, computer and telecommunications engineering at the Botswana International University of Science and Technology (BIUST). Before joining BIUST in 2015, he was a Senior Lecturer and Head of the Electrical and Electronics Engineering Department at the Federal University Oye-Ekiti, Nigeria. Adamu Murtala Zungeru is a Senior Member of the Institute of Electrical and Electronics Engineers (IEEE), a registered engineer with the Council for the Regulation of Engineering in Nigeria (COREN), Association for Computing Machinery (ACM) in the USA, and a Professional Engineer registered with the Botswana Engineers Registration Board (ERB). He is the Inventor of a Termite-hill routing algorithm for Wireless Sensor Networks and has two of his Patent applications registered with the World Intellectual Property Organization (WIPO). He has also authored 4 Academic books and over 60 international research articles in reputable Journals, including the IEEE Systems Journal, IEEE Internet of Things Journal, JNCA-Elsevier, and others, with over 900 citations and H-Index of 13. He has also served as an International reviewer to IEEE Transactions on Industrial Informatics, IEEE Sensors, IEEE Access, IEEE Transactions on Mobile Computing, IEEE Transactions on Sustainable Computing, JNCA-ELSEVIER and numerous others. He has also served as the Chairman of the IEEE Botswana Sub-Section, and presently serving as the IEEE Region 8 Vitality & Development Subcommittee Member.

JOSEPH M. CHUMA received the Ph.D. degree in electronic systems engineering from the University of Essex in 2001. He was with the University of Botswana as an Associate Professor and the Dean of the Faculty of Engineering and Technology, and he is at present a Full Professor and serving as the Acting Deputy Vice-Chancellor for Research, Development and Innovation. He is also the Substantive Dean of the Faculty of Engineering and Technology, Botswana International University of Science and Technology. He has over 24 years of experience in teaching and research, consultancy, and human resources development in telecommunication, computer, and electrical and electronics engineering in including CISCO computer networking. He has authored or co-authored three books, three book chapters, and many refereed published scholarly/scientific journal articles in the subject of telecommunications engineering. He holds three patents. He is a member of several professional bodies, among which includes the IEEE, USA; IET, U.K.; and BIE, Botswana. He is a Professional Engineer registered with the Botswana Engineers Registration Board.

CASPAR K. LEBEKWE was awarded a degree of MEng in Electronics and Communications Engineering at the University of Bath in 2008. He holds a Ph.D. in Electrical and Electronics Engineering, sponsored by the General Lighthouse Authorities at the same University. His Ph.D. project was focused on eLoran Service Volume Coverage Prediction. He is currently a Lecturer at Botswana International University of Science and Technology, where he teaches Optical Communications, Antennas and Propagation, Discrete Mathematics, Telemetry, and Remote Control as well as Electromagnetic Field Theory. He is a registered member of the IEEE.

PENDUKENI PHALAAGAE is a research assistant and a Ph.D. student in Computer and Telecommunications Engineering under the Department of Electrical, Computer, and Telecommunications Engineering at the Botswana International University of Science and Technology (BIUST). She obtained an M.Sc. in Information Systems from the Botswana International University of Science and Technology in 2018 and acquired a BSc. In Data Communication & Computer Networks in 2011 from Multimedia University in Malaysia, respectively.

JWAONE GABOITAOLELEWE is a research assistant and a Ph.D student in Computer and Telecommunications Engineering under the Department of Electrical, Computer, and Telecommunications Engineering at the Botswana International University of Science and Technology (BIUST). He obtained his BEng degree in Computer Engineering from the Botswana International University of Science and Technology (BIUST) in 2018. He has one of his Patent applications registered with the World Intellectual Property Organization (WIPO). He also has to his record, 2 Journals (One in IEEE Access, and the other in a Scopus Indexed Journal). His research interests are in wireless sensor networks, smart devices, and electronics design and applications.