The ever-growing demand for larger integration density, higher bandwidth, and lower power Over the past few years, due to the increase in consumption of daily usage resources, there has been rapid growth in demand for energy. Energy is derived from fossil fuels and as time passes fossil fuels deplete. So, we are in immediate need of an energy conservation system. For the implementation of this system, the Internet of Things (IoT) provides the solution to perform the tasks. This paper presents a cost-efficient, and energy-efficient Internet of Things (IoT) based system where different devices can be connected over the Internet resulting in conserving energy. Also, this paper proposes an additional feature of saving time by turning manual work into automatic, that is to automate the user attendance system. The proposed prototype of "IoT Based Electricity Conservation and Biometric Attendance System” focuses on integrating the above two functionalities and can be accomplished using a PIR sensor and fingerprint sensor. If the PIR detects any motion, it sends a signal to NodeMCU which in turn triggers the relay to turn on the lights and turn off if no motion is detected. The fingerprint sensor scans the biometric of the person and marks attendance for that day