de0 nano to measure temperature of a liquid, greetings from Colombia

Hello

I need help with the following project

Temperature Control

- Should survey the temperature of a heat emitting system.

- The temperature signal must be connected to one of the ports A / D of nano-DE0

- The Deo-nano must control a fan that reduces temperature heat emitting system

- In 2 7 Segment displays (or LCD display) should displaying the temperature value.

- Through the switches (or external keyboard) should set the desired temperature.

- To observe the desired temperature and the actual temperature of system must press a button to select the

temperature to observe.

Thermocouple what can I use?

ideas, suggestions

perdon por mi ingles, traducido por https://translate.google.com/

Gracias de antemano