This I2C digital temperature sensor is one of the more accurate/precise we've ever seen, with a typical accuracy of ?0.25?C over the sensor's -40?C to 125?C range and precision of 0.0625?C. They work great with any microcontroller using standard i2c. There are 3 address pins so you can connect up to 8 to a single I2C bus without address collisions. Best of all, a wide voltage range makes is usable with 2.7V to 5.5V logic! Unlike the DS18B20, this sensor does not come in through-hole package so we placed this small sensor on a breakout board PCB for easy use. The PCB includes mounting holes, and pull down resistors for the 3 address pins. Adafruit even wrote a lovely little that will work with any Arduino compatible. You'll be up and running in 15 minutes or less. Some quick specs:

• Simple I2C control
• Up to 8 on a single I2C bus with adjustable address pins
• 0.25?C typical precision over -40?C to 125?C range (0.5?C guaranteed max from -20?C to 100?C)
• 0.0625?C resolution
• 2.7V to 5.5V power and logic voltage range
• Operating Current: 200 ?A (typical)