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Day/Night Sensor Medivial Watchtower

This is a little building with a day night sensor. Good to switch lights on in the night. It can also be used as a watchtower

Two things are important.
First the lights will go on at about 10:30 and will switch off again at about 6:30. Unfortunately it isn't possible to activate it earlier.

The system just works reliable for lights in a radius of about a half claim (32 blocks) around the building. For lights farther away it looks like it would work, but it only works, if you were at the building in advance and this claim is still loaded. Further away the routines will be unloaded after sometime and the lights won't be switched on and off any mor.

I will make additional buildings with exact the same functionality. (Country, Industrial, Town, Galactic)

How does the sensor work?
The ghost pigsie will burn in daylight and so only 1-2 pigsies will be seen, before the first pigsy burns to death. At night 4 pigsies will spawn and live until dawn.

The number comparison gate for 0 mobs is used to activate the system for sure!
Then there is one number comparison gate for less then 4 mobs, making sure more will spawn.
Then you need one for more then 3, which turns on the light.
The delay gate just makes sure, that the mobs won't spawn too fast.

Detailed Wiring Information:
Mob Spawner:
Very easy it is to spawn a mob, that dies in the sun. Best are the ghost mobs as they die faster then any other mob. On a mob spawner can spawn a maximum of 4 mobs at the same time! So one must die before the next can spawn.

Sensor:
The sensor just counts the mobs that have spawned.

DelayGate (DG):
It delays the spawning of the next mob. Without I encountered problems.

NumberCompareGate1 (NCG):
This Gate initialises the whole system when it is loaded it checks if there are any mobs spawned. If not, it sends true to the DG.
Normally it checked if the number of mobs is 0, but after an update it could neccessary be to change it to event and check for false.

NCG2:
Checks if there are less then the maximum mobs have spawned.
If not it sends true to the DG.

NCG3:
This delay gate is the light switch of the whole system. It checks if there are more then 3 mobs spawned. If there are more then 3 mobs it means the sun is gone and they don't burn up in the sun anymore.
If yes it send true to the lamps.
So the output value of this NCG switches the lights.

I use the term lights here, because this is the main prupose of this blueprint, but you can switch any machine, even open and close doors. I think there are many things you can use in an adventure. For example put an inverter behind and switch a block phaser with it, which phases out some blocks. So the sun light will light a special area or a special item. ;)