hey,I have decided to buy everything from this link:http://diydrones.com/profiles/blogs/ardupilot-main-pageand figure out things later...but a few question rose immediately -1 - how is altitude sensed? (in the ArduPilot Shield Kit there's only airspeed sensing)2 - I understand that the xyz sensing uses thermopiles. I'm unfamiliar with this technology. where can i find data sheets, or reading material?thanks for any help...
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You can read more about thermopile theory here.