LM35 Sensor Not Responding to Room Temperature Changes Outside AC Duct—Why?

hi everyone,

i am intend to build a thermometer for house to controlling speed of cooling system.

The sensor that i used for this porpose is LM35 but it is not able to measuring room temperature accuratly, i don't know reason of this. when the cooling system is worked and we are chilled, the themperature that sensor is displayed was steady and not changed.

first i think that the position of sensor is not correct and for this reason i am reposit the sensor but still the sensivity of sensor not changed. just when i posit the sensor in AC duct the sesor work correct. this is due to intensity of air flow.

important thing is i should posit the sensor in the main conrolling box and because this i can't posit the sensor in the ac duct.

i am searching for the ways to eliminate this problem. I am grateful for your guidance.

Hi,

In my opinion it is safe to say that the temperature will really change from time to time since the temperature is not yet constant in the room. Ofcourse, law of thermodynamics will come to play in this. https://www.boundless.com/chemistry/textbooks...23/the-three-laws-of-thermodynamics-496-3601/

For the sensor, I don't have any issue with it. Maybe its the threshold of the sensor that seems not being reached.