This is an automatic sheep shearing farm in which you don't have to do anything once it is built! (except to collect the wool from the barrel and restock shears into the dispensers)
There will be additional materials needed for this project other than what is listed in the material list. This is the most compact design that I can come up with. Colored glass and colored wool is for aesthetics only, any block will do. Grass must have a transparent block above it to allow for grass spread. Don't forget to add at least 1 shear to each dispenser!
This design is inspired by Pixlriffs.
Also note that there is a hopper minecart pushed into the grass block that the sheep stands on to allow collection. Therefore, you will need an extra 16 hoppers and 16 minecarts.
You will need the following for assembly:
Please watch Pixlriffs' video attached for a guide on how to push the minecart hopper into place. Skip to 7:27 and stop at about 8:33 if you don't want to watch the whole video.
173 White Stained Glass (some of these are colored glass, but you can change them out as you see fit)
61 Grass Block
32 Solid Blocks (some of these are colored wool blocks, but you can change them out as you see fit. Only 16 is actually required for redstone)
32 Hopper (for the collection system)
16 Minecarts (for the collection system)
16 Redstone Dust
16 Spruce Trapdoor (any trapdoor will do)
16 Shears (you can add more depending on how many shears you'd like in each dispenser- maximum is 144 shears)
Survival raw materials:
Total iron required: 272
Total quartz required: 16
Total redstone required: 48
Silk Touch Tool may be required for grass block collection!