Building Wireless Sensor Networks
by Robert Faludi · first published 2010
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…when you only need to monitor a few signals is to use an xbee series 2 module, that will also wirelessly transfer the data to a central server. It can run attached to an Arduino, but also stand-alone. "Building Wireless Sensor Networks", by Robert Faludi, is a very readable introduction.
on “How to run an Arduino clone on a 9V battery for weeks or even months” ↗Is this what you are looking for: http://oreilly.com/catalog/9780596807740 Building Wireless Sensor Networks with ZigBee, XBee, Arduino, and Processing
on “Ask HN: sensors that export data?” ↗