LM35 as a room temperature sensor (any other good alternatives)?

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?
  • As LM35 doesn't use single supply according to datasheet, so what is single supply?
  • Is there an alternative sensor that could be easy to implement or better accuracy or requires low power?

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

Thanks.

The LM35 is single supply, if the temperature range in question is 2-150C.

With a 9V battery and a simple voltmeter (moving-magnet, the kind with a scale and a pointer) you'll be reading room temperature/s in a snap.

A lot of your questions sound like they're from an assignment.

runaway_pancake: A lot of your questions sound like they're from an assignment.

Like I have mentioned I am doing a project for my diploma, and I have to give reasons to why I use each component. So, its just terms that I need to understand in order to explain why I choose the component and also to find a better component than the one already proposed. I have tried on google and I wasn't able to find the answer I am looking for (maybe I don't know how to search).

runaway_pancake: The LM35 is single supply, if the temperature range in question is 2-150C.

Ok, but the datasheet didn't mention it. Are you sure of this, and can I have a reference on where you got this information. thanks.

Here is a link to the datasheet -- http://www.jameco.com/Jameco/Products/ProdDS/155740.pdf

See Figure1 on page 1 of the datasheet (there's a title page.)

If LM35 is a good sensor for the mentioned purpose?

Hard to say - what is the requirement? What precision do you need? What accuracy? Is low power consumption a concern? Cost? What will you do with the data? What will read it? - I assume an Arduino, since you're asking here. How many sensors will you need to read?

Having said all that, for digital readings of (possibly) multiple sensors in a room temperature range, the DS18B20 is a popular choice - search the forums, it comes up often.

It just needs to sense the room temperature no special requirement. A +/- 2 Degree Celsius is exceptable. Cost is should be less since this is a project for my diploma. I use an arduino uno. The data received is sent wirelessly to a display. This project is to learn to interface sensors, to make a display and to send data wirelessly. Its just for learning.