Automatic temperature controlled motor speed

Automatic controls play an ever-increasing role in a human way of life. Automatic control is vast technological area whose central aim is to develop control strategies that improve performance when they applied to a system, the distinct characteristic of automatic control is that it reduces the human operator. One such gadget is the fan. The fans are generally available with speed control, depending on the requirement the speed is set. Usually, when the temperature is high the fan set at high speed and at lower temperatures the fan is operated with lower speed. This is done manually using human. In this paper, an automatic control solution is suggested to control the fan speed. A circuit with LM35 temperature sensor, PIC16F877A microcontroller, brush less DC motor and few of electronic components is designed and implemented to control the fan speed automatically. As an additional feature LCD is used to present the temperature and the fan speed. The system first will get the temperature sense from the temperature measuring IC sensor corresponding to which to which temperature digits are obtained and displayed and it will control the speed of the dc motor (fan) according the duty cycle (PWM) values that are set through the programming. As for the objective, the main objective of this project is to build and examine the automatic temperature controlled motor speed on how it works by interfacing some circuit, components like LCD and dc motor, and IC sensor with the microcontroller that are programmed. Design tools are needed to design this project for the simulation and hardware. However, there is also some problems that this project encountered while conducting the project.