I am controlling two items (a sensor and a 8-bit DAC) on my first AVR project which are controlled on two-wire buses with a clock and data line. I have heard some people insist on putting a current limiting resistor in series on the data line (maybe 330 ohms). Neither datasheet for either part claim this is necessary or recommended.
Should I be doing this? If so, does the clock not need the resistor because it will not be bi-directional?
Thanks for your comments.