Arduino Micro , I2C not communicate

Projects Networking, Protocols, and Devices
1

Hi Forum members

Since several days I try to port my project from Arduino UNO to an Arduino MICRO.
the software runs well so far, the only trouble I get is with the I2C bus.

the pins on the MICRO are named 2/SDA and 3(PWM)/SCL, it looks like some double function
Is there anything I need to configure for the mentioned pins in order to use them for I2C?

the same software runs perfectly with the UNO and with the LEONARDO.

To make things more simple I try to solve the issue with the I2C_scanner.

I did connect 3.3V to my Abracon RTC, GND and the above mentioned SDA and SCL via a level shifter. same hardware as with the UNO or LEONARDO.

Did someone already realize I2C with the MICRO and what need to be done to configure the IC2 pins?

Thx a lot for any help

rgds
Martin from Vienna, Austria

2

What board setting (in the IDE) do you choose to compile for the Micro?

3

Hi, I use the setting "Arduino Micro"
and: we did try with 2 "Arduino Micro" as I bought 2 for both of our engineering team.

4

Hi and so sorry

I have no idea what I did make stupid wrong, today I made a totally new wire connection from scratch, and it works.

Sorry for any inconvenience.

rgds
Martin