Gikfun Soil Moisture Kit (EK1915)

I purchased this kit to learn how to integrate a soil moisture detection circuit with a watering pump mechanism.  This kit works however I have the following criticisms:

• It came with no instructions
• The one schematic on amazon is incorrect
• There is no arduino involved (contrary to the description)

DHT11 - Temperature & Humidity

The DHT11 is a Temperature and Humidty sensor with a very simple wiring and coding interface.