elevator

local level = 0
local direction = "up"

local function writeLevel()
    h = fs.open("level", "w")
    h.writeLine(level)
    h.close()
end

local function readLevel()
    h = fs.open("level", "r")
    level = tostring(h.readLine())
    h.close()
end

local function up()
    redstone.setOutput("left", true)
    os.sleep(1/10)
    redstone.setOutput("left", false)
    level = level + 1
    writeLevel()
    os.sleep(1)
end

local function down()
    redstone.setOutput("right", true)
    os.sleep(1/10)
    redstone.setOutput("right", false)
    level = level - 1
    writeLevel()
    os.sleep(1)
end



readLevel()

while true do
    if level == 180 then
        direction = "down"
    elseif level == 0 then
        direction = "up"
    end

    if direction == "up" then
        up()
    else
        down()
    end
end