Temperature Control

INTRODUCTION

Now a days whole industrial operation are controlled through the control system, as the control system will take care of the I/O results. The control system can be applied for controlling the output using different inputs. Therefore the control system application extends for vast areas. Temperature control system is one of them. The present temperature control system is a microcontroller based one. The advantage of using the microcontroller in control system is that it will take care of much input and many outputs at a time. The other thing is that the microcontroller is intelligent one by the program inside. It will take care of every thing and so the parameters can be varied. The control system is divided into two categories like
a) Open loop
b) Close loop.

Open loop control system is that which doesn’t automatically correct for variations in its output, is called an open-loop system.
Close loop control system is that which will take the output data to control it’s input so that output will vary to attain the required output.
The present temperature control system is a closed loop application. Therefore it will take the data from its output and will process the data to control the output to attain the constant temperature. The microcontroller used is PIC16F873. Temperature set here is in centigrade.
The present project has various applications in the field of temperature related applications such as chemical processing unit, cold storage units,   other research laboratories etc.

FEATURES :-  

 MICROCONTROLLER BASED APPLICATION
 TEMPERAURE   CAN BE SET BY THE USER
 TEXT LCD IS USED FOR DISPLAY THE   SET TEMPERATURE.
 CLOSED LOOP CONTROL SYSTEM USED.
 TEMPERATURE   (CELSIUS) UP TO TWO DIGIT CAN BE CONTROLLED.

BLOCK DIAGRAM :-

Sensor   section uses a   centigrade sensor   for the sensing temperature and send signal after amplifying it to the microcontroller section.
Microcontroller section uses   8-bit microcontroller...