Can I use I2C and still use pins 0-7?

Other Hardware Displays
1

If I am using the LiquidCrystal_I2C library and assigning pins as below.

LiquidCrystal_I2C lcd(0x27,2,1,0,4,5,6,7,3, POSITIVE);

Can I still use the digital pins 0-7 for other things even though I am only connecting A4 and A5?

2

Yes, of course you can. Only A4, A5 are used by the Uno.

Note that Uno's 0, 1 are Serial. You don't use them for anything else.

3 
LiquidCrystal_I2C lcd(0x27,2,1,0,4,5,6,7,3, POSITIVE);

The 0 - 7 here are the pins on the adaptor chip, not your UNO, so you aer OK to use 2-7, as David has already said 0 & 1 are used for the Serial connection!

4

Thanks Guys, I should have realised that.

5

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