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temperature control system using lm35 pid

Abstract

The objective of our project is maintaining the temperature constant in a particular area using analog PID controller. The motivation for doing this project is the fact that temperature control has become an integral part of any control system operating in a temperature sensitive environment Whatever the process or the parameter (temp, flow, speed, ..) the principles of control are similar. Input and output signals are specified in this project are analog. Control of a process is achieved by means of a closed loop circuit. One of the primary purposes of using feedback in control system is to reduce the sensitivity of the system to parameter variations.The project deals with a simple aspect of giving information about the controlling of temperature in a furnace. In this project we are developing a system, which can control temperature of a furnace automatically. The furnace temperature is compared with the value set by the user and if the temperature goes beyond the Preset temperature then heater will get off and if temperature goes below the set value then heater gets on.In this project we tried to control the temperature of surrounding area of the bulb.Initially the input voltage of the system for a particular temperature at bulb is noted and it is taken as reference or set point and that temperature is maintained constant using analog pid controller with the help of heat sensor LM35 whose output is fed back to the input as feed back.