I2C on old Nano

[TomGeorge]

@rickir206

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 says it does, another shows A4 and A5 as analog input only. Didn't find anything helpful on the web.

What are the I2C devices you are connected to?
Can you please post a schematic of your project, including power supplies?

Thanks.. Tom..