automatic room fan controller using opamp and lm35 temperature sensor
#1

can you provide me the project of automatic room fan controller using opamp and lm35 temperature sensor?
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#2

Abstract

The project is based on the working of temperature controller using LM35 and fan ascooler. The circuit automatically senses the temperature and works normally within a particulartemperature range. Above that range the sensor produces a signal and automatically turns on thecooling fan to control the testing temperature. 0-100°C electronic temperature controlled relay isa circuit using which the temperature can be controlled with the help of a LM35 temperaturesensor.The LM35 series are precision integrated-circuit temperature sensors, whose output voltage islinearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage
over linear temperature sensors calibrated in˚ Kelvin, as the user is not required to
subtract alarge constant voltage from its output to obtain convenient Centigrade scaling. The LM35 doesnot require any external calibration.Using a precision reference (TL431) a temperature is set and an accurate comparator in order toconstruct a simple thermal controlled switch. The temperature that is set is compared with theoutput of the LM35 which decides whether to energize or de-energize the relay.An LED and an alarm are used to indicate when the device crosses the set temperature.The circuit is very useful in practical areas like heater, iron box etc
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