This paper introduces an ARDUINO UNO-based automatic room temperature fan speed controller. The purpose of this presentation is to provide an overview of a standalone automatic fan speed controller that regulates fan speed in accordance with our needs. The LM35 temperature sensors are intended to be detected by this system, which then transforms the data into an electrical analogue signal that can be applied to the microcontroller. On the 16*2-line LCD, the temperatures sensed and set values are shown. The system is user-friendly because to the Liquid Crystal Display (LCD). On the LCD panel, the figures for the measured temperature and fan speed level are shown concurrently. The power supply for this project is regulated at 12V, 2A. It can be used for many different purposes, including as air conditioners, water heaters, incubators, snow-melters, heat exchangers, furnaces, and thermal pots. It is also highly compact and only requires a small number of components.

Temperature sensor (LM35), ARDUINO UNO, FAN, LCD display, Transistor