I2C Bus for ATtiny and ATmega

Step 2 Order some I2C devices

Now that you know a little about the I2C Bus and want to use it, why not order some I2C devices to experiment with now so they can be on the way to you while you're getting the software ready?

Appropriate devices include an I/O Interface Expander (my favorite), a Static Ram, and an EEPROM. There's lots more, but these are a great start. The AVR processors we'll use are the ATtiny2313 and the Atmega168 (used in Arduino). If you're new to these, then have a look at this great Instructable to learn about them and build your Ghetto Development System. The schematic of the ATmega168 in the present Instructable shows how to implement the Ghetto Development System for this processor. The parallel port cable is the same as the one for the ATtiny2313. (I haven't tried the USB version of the Ghetto Development System, so I'm not sure how the I2C bus is accessed on it. Same for the Arduino.)

Here are Digikey part numbers.
Port Expander:
IC I2C I/O EXPANDER 568-4236-5-ND
Ram:
IC SRAM 256X8 W/I2C 568-1071-5-ND
EEPROM :
IC EEPROM SERIAL 16K CAT24C16LI-G-ND