LuaScripts/craftCrystal.lua

local robot = require("robot")
local component = require("component")
local sides = require("sides")
local rs = component.redstone
local flag = false;
while true do
  if rs.getInput(sides.top) > 0 then
    if not flag then
      robot.turnAround()
      flag = true
    end
    robot.suck()
    robot.dropDown()
  else
    if flag then
      robot.turnAround()
      flag = false
      os.sleep(5)
    end
    robot.suckDown()
    robot.drop()
  end
end