This mechanism requires an open space and requires sunlight. After installation, it does not require any additional settings or player intervention.
Three working positions, in order from left to right-Clear weather, Rain and Thunderstorms.
IT DOESN'T WORK AT NIGHT! Due to the principle of operation from two sensors of daylight and moonlight, the latter is illuminated at night. There is no way to avoid this. At night, the mechanism itself turns off, so as not to confuse the average player with their illuminated lamps.
It is triggered instantly, as soon as the command to change the weather is activated, it immediately reacts. Because if you switched to the signal "Thunderstorm", then believe the mechanism, and not your eyes), so seconds later the sky will darken and it will rain. Of course, if everything is done correctly and checked.
Below is a link to a video of the mechanism.
I don't know if anyone did something like this, but I didn't find anything similar on the Internet at all. I lay out my work in order that they are not wasted.
I almost forgot... I have Minecraft pocket edition V. 1.14.60, but the mechanism works on earlier versions. I can't say anything about Java, it hasn't been tested in the field. My gadget on Android 4.4, if I have no problems pulling any of my mechanism, then you should all work.
It is not stupid for those who are used to living in a bunker, to fly out in a thunderstorm under lightning is very unpleasant (. Near the entrance built and will not will eyes for indicators cling.
And so you seem to have a good scheme, but it's too cumbersome, the main thing is the availability of the mechanism, ease of manufacture. You can do everything less, so why build them on the floor of the sky? For example, a 7-segment indicator can be built with the dimensions 7×5×9 (as a counter), and 7×5×13 (for displaying any given digit). Switch signals through a 3×4×10 leather frame to enable 7 positions or devices. And so on. and so... In General, I will think and create an alphabet indicator with a screen of 7×5, in theory, the size should be 9×7×29... somewhere like this.