Hi, Does anyone have any idea why my R3 Uno would be trying to perform I2C communications on the previously used A4/A5 pins rather than the newer dedicated SCL/SDA. I can see appropriate signals using an oscilloscope when I run the I2C address scanner but only on A4/A5, not on SCL/SDA. I can't see …

R3 Uno writing I2C signals to A4/A5 not SCL/SDA

Topic		Replies	Views
UNO R3 (sda-scl and pins 4-5) LEDs and Multiplexing	11	79551	May 6, 2021
arduino UNO sda scl pines para I2C Hardware	4	12059	May 7, 2021
Wire library I/O pins used? Programming	3	5159	May 5, 2021
I2C Scanner Hangs - Uno Clone Hardware Issue? - Trouble shooting advice needed Networking, Protocols, and Devices	9	3317	May 6, 2021
UNO R3 I2C pins A4,A5 vs SDA and SCL next to AREF Displays	3	3932	May 6, 2021