If you have an old Nokia 3310 cell phone, don't throw it away. You can use its LCD screen for this cool project. This project describes the use of such a LCD to display temperature. It uses PIC12F629 microchip as a brain that reads temperature measurement from a DS18B20 sensor, and displays it on a Nokia 3310 LCD screen. Source: http://www.ivica-novakovic.from.hr/Nokia%20Lcd%20Termometar-eng.htm
PIC Programming in C