Design an automatic temperature control system based on pic controller for smart ventilation fan

This paper presents an inventive prototype design of ventilation fan with smart features.uses a microcontroller to create an automation function.automatically according to the temperature which set by the user.This is to ensure the cooling process, especially for large space and also in hot weather due to global warming works well and effectively.An LM35 temperature sensor is placed in the room temperature.The PIC16F887 temperature detected by the sensor.Users initially set the temperature to ON the fan together with overheat temperature to ON the buzzer.If the the ventilation fan will function while the buzzer will produce sound when it is set value.Thus, through this circuit, it is easy to use and make human's life simpler and better.