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The energy consumption rate around the world is increasing. A large amount of energy is consumed for lighting purposes. The lighting system is accounted for approximately 19% of total energy consumption. So, development is needed in the lighting system to save energy. This paper represents an energy-saving smart lighting system for commercial buildings. This is a user-friendly system based on Arduino Nano and NodeMCU. This system can be easily controlled by Wi-Fi module. Here, node MCU works as Wi-Fi Module chip. It is low cost and can be configured to connect to the Internet for Internet of Things (IoT). Experimental results show that energy can be saved because it consumes less power than the normal lighting system. The day-light sensor provides the system more accurate. A light dimming property is performed with the help of a daylight sensor. We have scheduled running office time for enlightened the working place of a building as well. The proposed system has both automatic and personal control system.

The space elevator is a type of transportation objects from the earth to space. It would enable a cost-effective space ride for human to explore and exercise space science. The primary component of a space elevator is a cable. It would be extended into space from the Earth’s surface which would lift the elevator. Carbon nanotube is one of the potential materials for the cable. In this study, some electrical and mechanical properties of the carbon nanotube are analyzed. Simulations are carried out to illustrate the parameters which support the fact that carbon nanotube can be used as tether and sensor material in the space elevator projects. Information gained from this work would be useful for construction and related applications of carbon nanotube-based space elevator.

In recent days everything depends on smart technology. Irrigation system is also becoming smart by using modern technologies, which is more advantageous rather than the traditional methods. In this paper, a smart irrigation system is developed that automates the irrigation process with the help of solar power. This proposed system can optimize the use of water based on different data, such as soil moisture, weather prediction, etc. It will also notify its owner about the current condition of the soil and motor through GSM technology. This proposed model can automatically turn ON and OFF the motor pump by sensing the moisture content of the soil depending on the demand of water in the field. A moisture sensor is used to collect data (soil moister level) of a particular area. The motor will automatically turn OFF after fulfilling the demand of water and get turns ON again when the field becomes dry. GSM technology is used to send the update (ON/OFF) of a motor to the farmers. The whole proposed system is controlled by an Arduino. Here, DC power is generated from the solar panel. All these features will make irrigation system much smarter and economical.