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In Recent days, the usage of electricity has reached high due to the increase in usage of electrical devices in domestic and industrial appliances. As power is crucial for economic and Industrial development of a nation, so saving and controlling electricity is important (or) essential. This project proposes on how to design temperature based fan speed control and monitoring with a LM-35 sensor and Arduino. In the proposed work ,the microcontroller controls the speed of an electric fan according to requirement and allows dynamic and faster operation and the LCD used makes the project user friendly and shows the temperature changes and also the efficiency of fan at real time. Hence this project is used to save electricity which consumes less power for usages.