查询了无数中文资料，测试了N个代码，没有一个能成功读出数据。
甚至怀疑淘宝来的DHT11是坏的。在网上没有找到检测DHT11好坏的中文资料。有谁知道了，告诉我一声。
最终没办法，只有查英文资料，功夫不负有心人，找到一篇2012年发表的资料：
http://www.rpiblog.com/2012/11/interfacing-temperature-and-humidity.html
直接COPY & PASTE 。
用嘴吹DHT11，数据也有变化，说明测试是成功的。
Humidity = 36.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 35.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 36.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 35.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 35.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 35.0 % Temperature = 25.0 *C (77.0 *F)
Invalid Data!!
Invalid Data!!
Humidity = 36.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 35.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 35.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 35.0 % Temperature = 26.0 *C (78.8 *F)
Humidity = 39.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 36.0 % Temperature = 25.0 *C (77.0 *F)
Humidity = 38.0 % Temperature = 26.0 *C (78.8 *F)
Humidity = 40.0 % Temperature = 27.0 *C (80.6 *F)
Humidity = 42.0 % Temperature = 27.0 *C (80.6 *F)
Humidity = 43.0 % Temperature = 27.0 *C (80.6 *F)
Humidity = 44.0 % Temperature = 28.0 *C (82.4 *F)
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