I have made temperature sensor in the past, but now I added power saving features to the code.
The result was a device which lasts almost a month when it reports temperature once an hour over XBee and is powered by 1000mAh LiPo battery.
![Custom XBee Shield with DS18B20](https://farm3.staticflickr.com/2921/14259493213_8a7872cdc4_n.jpg)
Instead of official Arduino, I used …
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