Tired of harvesting by hand? A redstone farm grows and collects crops for you while you go explore. This design uses water flows and pistons to break crops and wash them into a chest — a great first redstone project.
Dirt / Farmland
~48
Water Bucket
2
Pistons
~12
Redstone Dust
~16
Hopper + Chest
1 each
Glowstone
~8

Till dirt into farmland in a 9-by-5 patch. Dig a one-block trench down the middle and fill it with water using your bucket — water reaches up to 4 blocks on each side, keeping crops hydrated.

Place pistons facing the crops at one end. Wire redstone dust to a lever so the pistons push and break the crops. Put a hopper at the water outlet flowing into a chest to catch the drops.

Place glowstone (or torches) above the farm so crops grow through the night too. Plant wheat, carrots, or potatoes, then flip the lever whenever they're tall — the farm does the rest.
★ Pro tip: Crops only grow when a player is nearby — build your farm close to your base so it stays 'loaded'.