local TobiasId = 21
local YannikId = 17
local RobertId = 20

local rednetSide = 'top'
local closeSide = 'right'
local openSide = 'left'

local doorOpenTime = 200

local doorSize = 3

--Do not change, otherwise you will have problems!
local counter = 0

local function isValid(id)
    if id == TobiasId then
        return true
    end
    if id == YannikId then
        return true
    end
    if id == RobertId then
        return true
    end
return false
end

local function openDoor()
    while counter < doorSize do
    redstone.setOutput(openSide, true)
    sleep(5)
    redstone.setOutput(openSide, false)
    counter = counter + 1
    end
    counter = 0
end

local function closeDoor()
    while counter < doorSize do
    redstone.setOutput(closeSide, true)
    sleep(5)
    redstone.setOutput(closeSide, false)
    counter = counter + 1
    end
    counter = 0
end



--Hauptprogramm
rednet.open(rednetSide)

id,message,distance = rednet.receive()

if isValid(id) == true then
    if distance < 500 then
        openDoor
        sleep(doorOpenTime)
        closeDoor
        sleep(10)
    end
end
rednet.close(rednetSide)
os.reboot()