I'm making a temp sensor for a greenhouse that will use a Series 2 xbee to communicate with a base station inside a house.
The base station has an Uno and a 20x4 LCD screen. I already have this working.
My question is about the sensor in the greenhouse.
I plan on having a tmp 36 sensor connected to the xbee and am thinking of using this battery which is 3.7 v . http://www.adafruit.com/products/354
My question is about power and capacitors.
The Xbee needs 3.3 v and the battery supplies 3.7 v.
If I use a 3.3 v power regulator like this https://www.sparkfun.com/products/526
do I need to add capacitors to keep the power supply smooth?
Also what size capacitor and do I need ceramic capacitors as I read electrolytic capacitors have liquid in them and can freeze.
Also how will cold weather affect battery life?