MemberMay 18, 2021 at 3:57 pm
thank you for your reply. It pointed me to the problem.
As the Nextion Display requires more power than the pinheader supplies I connected it to an external 5V power supply.
Now, I connected the 5V GND’s of the external power supply and the Controllino pinheader.
Now i am getting a clean signal.
Thank you for directing me towards the solution!