UNO R3 I2C pins A4,A5 vs SDA and SCL next to AREF

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i have serial (pcf8574t controller chip) display working fine using a4 , a5 pins on uno i2c.
but, r3 of board has sda , scl pin next aref.

how use these?   yes, newbie, use simple words please! :)

many in advanced oh guru's. grasshoppers.

the 2 sets of pins connected in parallel. use either set. don't forget connect gnd gnd also.


Arduino Forum > Using Arduino > Displays > UNO R3 I2C pins A4,A5 vs SDA and SCL next to AREF


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