This is an Example of how you can use the Arduino to monitor various environmental parameters And display them on a LCD screen.
Note: I Added a Real Time Clock!! To see the steps, added parts and Sketch I added new steps..
Arduino uno R3 or compatible 30.00
Sainsmart “1.8” TFT Color LCD Display 18.50
DHT11 Digital Temperature and Humidity Sensor 6.44
Mini Breadboard 5.00
Jumper Wire
For more detail: Mini Arduino environment monitor