I am trying to use an old Arduino Nano (requires old boot loader) with I2C devices. SDA connected to pin A4, SCL to pin A5. I2c devices are on a separate power supply. Does not work. Ran I_2_C scanner program and it cannot find any devices. Does the old Nano design support I2C? One pinout I have…

I2C on old Nano

rickir206 October 15, 2021, 4:47pm 12

Thanks for your input. I got it working. It was a power supply issue.

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