Blink with millis: processor time shift?

[Whandall]

I think this statement

@gustav97

  startventilate(); // entlüftung der düsen 

should be on the top level of loop, and not be controlled by

@gustav97

if (currentpage == '1'){

You should also use ctrl-T in the IDE to format the code,
it would make the indentation match the real nesting level.