The docs for the MPU talks about SCL and SDA -- what pins are those? I don't see that explained in the docs...

Hi mikedoug,

Chapter 21 of the ATmega168 datasheet, titled "2-wire serial interface" and abbreviated TWI, is Atmel's way of avoiding the Philips trademarks on the name I2C. :-)

The actual pin numbers are MCU pin #28 for SCL, and MCU pin #27 for SDA. That's written on page 2 of the ATmega168 datasheet, under "pin configurations".

And I'm guessing that you're looking into this in relationship to the "Biology Project" post?

Mike

The Biology Project post got me looking into it -- that and a heck of a lot of curiosity. :)

MikeDoug