Technical Description:
The RHT03 is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn’t require extra components so you can immediately begin measuring relative humidity and temperature.
Limitations:
Although small and low cost, this sensor does not capture the range of environmental metrics, such as barometric pressure, that some other sensors capture.
Skill:
Beginner Coding Skills ⅕, Competent Electrical Prototyping ⅗
Sensor:
RHT03
https://www.sparkfun.com/products/10167
Sample Tutorial:
Humidity and Temperature Sensor with Arduino
http://www.theorycircuit.com/rht03-humidity-temperature-sensor-arduino/