The following project its a basic thermometer that can measure data from 2 sensors, for example you place one sensor inside the house and another one outside. The schematic is plain simple DS1621 or DS1631 digital temperature sensor and a bunch of resistors and diodes. You can use smd parts or trough-hole, it doesn’t really matter but if you want to keep things small and cool, i suggest you use smd. Also on the pcb you will solder a DB9 connector so you can stick the small pcb directly into your COM port. The measurement is than showed on the windows taskbar.
DS1621 pc thermometer: [Link]