@tomas_hora
I performed all the settings as per this link (https://www.raspberrypi-spy.co.uk/2014/11/enabling-the-i2c-interface-on-the-raspberry-pi/) and it didn't work out.

I'm suspecting that the problem is with unipi1.1 hardware, but I would like more testing alternatives before concluding this.

Can anybody help me ?

Hi Thomas,

I believe this is set up correctly. After this configuration, I rebooted the system but nothing happens with i2c.

Hello

I am trying to drive unipi relays through a ladder code developed under the openplc project, but nothing happens.

I tried to make all the necessary settings to run i2c, but when I run the command "i2cdetect -y 1" I would expect to receive the address of CI MCP23008 (0x20) and other i2c devices. I tried to use all the power combinations for RPI and the expansion board, but nothing works.

Can someone help me ?

I'm using unipi1.1 from Raspbian Stretch 9.9