24-08-2016, 11:19 PM
26-08-2016, 04:04 PM
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
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