PIC-circuit Implementation of Room Temperature Controller By using PIC16F873

Abstract

This paper deals with the PIC-circuit implementation of room temperature controller by using PIC16f873. Temperature controller-designed and constructed is PIC–based temperature controller (PIC16F873). In this control system, PIC16F873 is used as the heart of the temperature controller. Semiconductor temperature sensor, LM35DZ is used for data acquisition. LM35DZ temperature sensor, it senses the temperature and after amplification is then fed to the microcontroller. The microcontroller (PIC16F873) is the equipment which adjusts the temperature of the room automatically. On/Off operation is made by the set point using relay switch. Control mode (works over preset or below preset) is changed with a switch, two temperature sensors are used. This microcontroller can program with assembly language using microchip MPLAB IDE software development tools. Finally the output will show display control of six 7 segments LEDs, readings of the three BCD switch and reading up/down switch are performed. The developed software is highly accurate and works at a very high speed.