Temperature sensor LM35?

[yaantey]

Hey people,

Im doing an academic project in which I need to make a room temperature sensor? After some hours research I have found LM35. I would like to know:

• If LM35 is a good sensor for the mentioned purpose?
• Also, whats the importance of the quiescent current in a sensor? From my understand its good to have a low quiescent current sensor to make project power efficient.
• Importance of gain in a sensor? From my understand this will make the sensor more accurate by giving large output per variation of degree celcius. 
• Importance of output impedance in a sensor? Which I don't really know.
• Also, is using a digital sensor or analogue sensor better for this application?

Hope someone can give me genuine help to understand the mentioned questions. 

[Oli_Wachno]

Hi!

you might want to post your question in a different forum, this is the digital IO.

Chip manufacturers usually have quite a large number of app notes available on their websites, that probably might answer your questions.

E.g. http://www.national.com/mpf/LM/LM35.html#Documents

BTW. investigations in literature are usually part of academic projects

BR

Oli

[james88]

Hi

If you only want to acquire temperature in a room where the accuracy is not very important, that sensor will work great. It is very lineal and you dont need any signail conditioning, just apply voltage, gnd and read the signal from your analog input. I have used it many times because is the easiest sensor in the market.

Regards