I am new to this platform and would like to thank you for your kind answers.

I have connected an Arduino Nano to a PCF8591 (https://www.ebay.de/itm/152728540909?_ul=DE&rb_itemId=152728540909&rb_pgeo=DE&var=0).

The pins are all connected correctly and both components work.

But I can’t manage to generate random voltages.

I have programmed and tried different programs. I have also programmed it so that the AOUT pin is read out and the correct voltages are displayed in the output monitor. But nothing is displayed at the output. It would be really great if someone could program a sample code for me or tell me what I am doing wrong. Thank you very much Newton07