The best thing would be an active unit without wifi as it has an lcd and buttons that work offline.
If that is not possible I will think of a solution with deep sleep.
I guess it would need to wake up from time to time then to check if the "active" condition is met.

Thank you for the reply.
I would like to disable the wifi module in the night time.
Could I use modemsleep?
The next best thing would be to enable deep sleep during the night time.

Hi, would it be possible with a rule to disable the wifi on a button click and enable it again on a second click?
Thanks for suggestions.

As I am a beginner that line didn't ring a bell for me when I read it. Luckily I have bought plenty of different parts in advance and I found a level shifter. Now it works like a charm. Maybe the wiki entry could be dumbed down for beginners like me, that think it's enough to plug&play. Anyways,...

Okay, I will try that, thanks.

The text is weak in dark color instead of being bright and white on the blue background.

Hey thanks for the reply. I connected the four pins GND,VCC,SDA and SCL.
EDIT: The tip with the potmeter helped but the highest contrast is still barely visible.

Hi, I'm on build 20181220 on a Nodemcu V3. I try to connect an LCD 2004.
On the I2C scan it finds the lcd on address 0x27.
Now, when I enable the device and write "IP %ip%" on the first line, the display remains blank.
Also, I'm not really sure what interval is for.
Thanks for any hints.