One to 100% automatic farm for grain, potatoes or carrots, based on a villager farmer.
This to 100% Automatic Farm does not require manual replanting or harvesting of the grain, potatoes or carrots!
In addition, it is very inexpensive and good to build in survival after.
Instructions:The first thing you need is a base area, which you build out with a mincart loop track.
For unloading you now need a place where The Hopper-Minecart drives over 1-2 Hoppe to unload there.
These should then be connected to a box where all the crops end up.
Directly above the Minecart track a crop area should now be built, which fulfils all growth requirements (water/light)
For automatic harvesting you now need a, let's call him "helper".
It is important to note that this is the Villager class "farmer".
You have to fill his inventory with 8 stacks of grain seeds, so that he can harvest the grown grain, but not add it to his own inventory. (Simply drop the 8 stacks in front of him).
Once the crop has grown, the Villager will harvest it on its own once it has grown, thanks to the feature added in 1.8.
Important in building this farm, however, is that there are NO natural village nearby, otherwise the villagers only look in the direction of the village and do not do their work!
PS: The pictures in the description are with texturepack ... you should still be able to recognize everything without problems