Thank your follows. Perhaps one of you could help me with one of my technical issues.

My Multi Sensor Question on Arduino Forum

Here is the text of my problem/question I posted to the above forum:

I'm working on a project requiring more than one analog sensor. A 0v to 1v LM35 temp sensor and since my project is portable and on battery power, the 1S LiPo voltage (approx 3.2v to 4.2v).

So I did some reading on external and internal voltage references and how to use them to obtain more accurate readings (this article was very useful: http://blog.fiftythree.com/posts/measuring-battery-voltage).

I was thinking about using one of the cheap 0.9V-5V to 5V 600mA DC-DC Step-Up Boost Converter boards (they look like: Picture link to power my Arduino from the battery to give me a solid 5 volts. I'm guessing I could also use this as an external voltage reference (into AREF pin). This would then workout nicely for my battery measurements.

But what about the LM35? It wants a lower voltage reference if I want accuracy. Can you switch references (internal/external) and measure each value separately? Or do I need to bring down my LiPo voltage via voltage divider so both use same fixed VRef? (aka lowest common denominator).