Attached is a sample I just ran on my NP2 with these:
https://www.adafruit.com/products/292
https://www.adafruit.com/products/198
Connect:
• DAT (SDA) to I2C Data (SD)
• CLK (SCL) to I2C Clock (SC)
• 5V to 5V
• GND to GND
NOTE: I did not create the libraries used - I just got everything working on my NP2 - credit and thanks go to those who created the libraries and put in all the hard work making original code for these devices.