Here is an semi-auto assistance Farm. One button to automatically use the power-water to harvest and stack your food in the chest (by hoppers). You just need to plant crops by yourself.
CAUTION : dispenser on the roof could have a bad orientation in pasting it. Please check it !
- Potato & carrot crops (but expendable to all crops your want)
- Furnace, light
- Hoe dispenser
Made for 1.6 and later version.
Good Luck & Have Redstone !