As in any design development, there are challenges with the parts that one specified. I happened upon the DHT11 temperature and humidity sensor because of its dual function. It would turn out it was fun while the curiosity lasted. I have 3 of this and found that they are worthless junk. The temperature reading often jumps around 2 degrees, and at time 8 in consecutive samples. Also all three are extremely inaccurate. I had play with the Maxim DS18B20 quite early on and found them to be very accurate for solid state active sensor. One reason reason that I didn't choose it was my attracted to the DHT11's humidity capability. The bigger reason is the library for the DS18B20 is very memory intensive, and I had ran out of program memory as well as SRAM.
