startup

upper = 13
lower = 3
redstone.setOutput("top", false)
redstone.setOutput("front", false)

while true do
  r = redstone.getAnalogInput("back")
  if r >= upper then
    redstone.setOutput("top", false)
    sleep(0.5)
    redstone.setOutput("front", false)
  elseif r < lower then
    redstone.setOutput("top", true)
    sleep(0.5)
    redstone.setOutput("front", true)
  end
  sleep(5)
end