【How-to】How to make a comparator in minecraft

To make a piston, place 3 wood planks, 4 cobblestones, 1 iron ingot, and 1 redstone dust in the 3×3 crafting grid. When crafting with wood planks, you can use any kind of wood planks, such as oak, spruce, birch, jungle, acacia, dark oak, crimson, or warped planks.