Turtle Program: Automatic Farm

-- Auto mob farm
-- WInston Durand

canOutput = false
count = 0

function farm()
  canOutput = true
  while true do
    turtle.select(1)
    turtle.suck()
    if turtle.attack() then
      turtle.suck()
      if turtle.getItemCount(16) > 0 then
        canOutput = false
        turtle.turnLeft()
        for i = 1, 16 do
          count = count + turtle.getItemCount(i)
          turtle.select(i)
          turtle.drop()
        end
        turtle.select(1)
        turtle.turnRight()
        canOutput= true
        print(tostring(count) .. " items farmed")
      end
    else
      sleep(0.1)
    end
  end
end

function timer()
  while true do
    while not canOutput do
      sleep(0.1)
    end
    redstone.setOutput("back", true)
    sleep(0.5)
    redstone.setOutput("back", false)
    while not canOutput do
      sleep(0.1)
    end
    sleep(60)
  end
end

parallel.waitForAll(farm, timer)