Paper Key : IRJ************112
Author: Mohd Saquib Khan,Shubhanshu Pandey,Harsh Yadav
Date Published: 02 Sep 2024
Abstract
This paper presents an automatic temperature controller based on microcontroller. The system is based on microcontroller PIC16F877A connected with temperature sensor LM35DZ, LCD display, switching transistors and relays. The system design is divided into two parts; hardware and software. The temperature sensor LM35DZ senses a certain room temperature and transmits it to microcontroller PIC16F877A which decodes it and compares it with a preset temperature value stored in it. The microcontroller in turn automatically turns onoff a heater or fan based on the comparison result. The measured room temperature is displayed on the LCD display accordingly. This design considered preset temperature values of 26C as minimum and 29C as maximum. The system was tested and the result showed that switching occurs at temperatures of 25C and 300C. Therefore, the system will be useful in rooms, offices, department stores and other places where temperature regulation is required.