startup

rednet.open("left")
while true do

  local level = rednet.receive()
  if level == "Green" then
    rs.setOutput("top" , true)
    rs.setOutput("front", true)
    rs.setOutput("right", true)
  end

  if level == "Yellow" then
    rs,setOutput("front", true)
    rs.setOutput("right", true)
    rs.setOutput("top", false)
  end

  if level == "Red" then
    rs.setOutput("right", true)
    rs.setOutput("top", false)
    rs.setOutput("front", false)
  end
  os.sleep(600)
end