Solar X-rays:
Geomagnetic Field:
From n3kl.org
Lady Ada gives a most excellent tutorial on how to use the DHT-11 and DHT-22 sensors.
http://www.ladyada.net/learn/sensors/dht.html
We rarely see examples of multiple DHT sensors in opperation together though. So, if you want many sensors running at once, I point you to my blog on the subject. It is actually quite easy:
http://diy-scib.org/blog/multiple-dht-humidity-sensors-arduino
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