UselessBob

t = 0.5
loopTime = 0.1
waiting = 100

pos = 0

function offLight()
  if pos < 4 then
    turtle.forward()
    pos = pos + 1
    print(pos)
  else
    turtle.attack()
    rs.setOutput("bottom", false)
    sleep(t)
    rs.setOutput("bottom", true)
    sleep(t)
    rs.setOutput("bottom", false)
  end
end

function goHome()
  if pos > 0 then
    turtle.back()
    pos = pos - 1
    print(pos)
  end
end

while true do
  if rs.getInput("top") then
    while true do
      offLight()
      if not rs.getInput("top") then
        break
      end
    end
  end
  if not rs.getInput("top") then
    while true do
      goHome()
      if not rs.getInput("top") then
        break
      end
    end
  end
  sleep(loopTime)
  waiting = waiting - 1
  if waiting <= 0 then
    waiting = 100
    print("hibernating")
    os.pullEvent("redstone")
  end
end