Arduino Uno board, DHT11 sensor and I2C LCD1602 display

It was a rainy day and I felt that my room is cooler than normal days. This trigger me to find out the temperature and humidity in my room.
So I use Arduino Uno board, DHT 11 sensor, I2C LCM1602  or LCD1602 display, a few wires and batteries to get the temperature and humidity.
In order to make this thing to work, it needs DHT11 and  I2C LCM1602 libraries to be included in Arduino IDE.
Both libraries can be found here :-
1. https://arduino-info.wikispaces.com/LCD-Blue-I2C
2. http://playground.arduino.cc/Main/DHT11Lib
While the source code can be found here :-
http://arduino-info.wikispaces.com/PROJECT-Temp-Humidity-Display

Here are the results:-