We have a similar device, using better sensors, runs off 2 AAs (the DH11 is cheap but us not very accurate) - we run in deep sleep to get good battery life - we

We have a similar device, using better sensors, runs off 2 AAs (the DH11 is cheap but us not very accurate) - we run in deep sleep to get good battery life - we'll open source it soon. We configure it by making the device an AP an offering up a list of local APs on a tiny web server