i2c, wire.h and digital pin problems

all,

i've got arduino working on i2c wii nunchuck , blinkm using wire.h described todbot.
http://todbot.com/blog/2008/02/18/wiichuck-wii-nunchuck-adapter-available/
analog pins 2,3,4,5

separately, have 74hc595 working using shiftout instructions.
http://www.arduino.cc/en/tutorial/shiftout
5v, gnd, digital pins 8, 11, 12

i'd able send signals 595 based on values nunchuck.  problem is, when plug them both in , run program includes wire.h library, garbage out pins 595, , don't readings nunchuck.  for example, i'm not connecting 595 pins program.

any ideas why wire.h or i2c code interfering analog pins?

the hardware i2c on atmega168 uses same pins analog 4 & 5.  so when i2c mode enabled, these pins converted digital signals i2c connection , can no longer use them analog.  since how atmega168 built, can't use other pins hardware i2c.

there people working on software i2c use different pins.  search forums this.

Arduino Forum > Forum 2005-2010 (read only) > Software > Interfacing > i2c, wire.h and digital pin problems

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