Temperature Based Fan System

In many homes, classrooms and offices, ceiling fans are controlled manually using regulators.Users often forget to adjust the fan speed when the room temperature changes, which results in discomfort and unnecessary power consumption.This paper presents a low-cost prototype of a temperature based fan speed controller using an Arduino UNO and LM35 temperature sensor.The sensed temperature is processed by the microcontroller and a PWM signal is generated to control the fan speed automatically.The system displays the current temperature and fan speed on a 16×2 LCD.The proposed solution is simple, reliable, energy-efficient and suitable for smart home and automation applications.