decoder

function main()

  while 1==1 do
    val = rs.getAnalogInput("front")

    if val > 8 then
      val = val - 8
      rs.setAnalogOutput("back", 15)
    else
      rs.setAnalogOutput("back", 0)
    end

    if val > 4 then
      val = val - 4
      rs.setAnalogOutput("left", 15)
    else
      rs.setAnalogOutput("left", 0)
    end

    if val > 2 then
      val = val - 2
      rs.setAnalogOutput("right", 15)
    else
      rs.setAnalogOutput("right", 0)
    end

    if val > 1 then
      rs.setAnalogOutput("bottom", 15)
    else
      rs.setAnalogOutput("bottom", 0)
    end

    sleep(1)
  end
end

main()