This  DS18B20 1-WIRE Digital Thermometer with 9 to 12 bit programmable resolution.

• Unique 1-Wire interface only requires ONE data pin for communication
• Each device has a unique 64-bit serial number stored in an on-board ROM
• Can be powered from the data line with a power supply range of 3.0V to 5.5V in Parasite mode
• Measures temperatures from -55°C to +125°C
• ±0.5°C accuracy from -10°C to +85°C

• Thermometer resolution is user-selectable from 9 to 12 bits
• Converts temperature to 12-bit digital word in 750ms (max)
• Demo Python program

• Minimum Requirements – a Raspberry Pi with Raspbian (wheezy) installed ,