AE Observer for CC

-- time waiting after each check
local timeout = 30
local terminalside = "back"

-- name of item, itemid, itemmetavalue (0 for items without metadata), qty to keep in system
local observerlist = {
    { name = "Pulverized Obsidian", id = 20264, metadata = 3, maxqty = 360},
    { name = "Glass", id = 20, metadata = 0, maxqty = 128},
    { name = "Invar Ingot", id = 20264, metadata = 71, maxqty = 32},
    { name = "Graphite Bar", id = 18006, metadata = 2, maxqty = 64}
}

-- Iterates through items in observerlist and checks if the current quantity
-- in the ae is lower than the quantity you wish to have, if this is the case
-- the computer crafts the difference of items.
function checkItems()
    for k,item in pairs(observerlist) do
        currentqty = peripheral.call(terminalside, "countOfItemType", item.id, item.metadata)
        if currentqty < item.maxqty then
            print("need to craft " .. (item.maxqty - currentqty) .. " " .. item.name .. "(" .. item.id ..":"..item.metadata..")")
            craftItem(item.id, item.metadata, item.maxqty - currentqty)
        end
    end
end

-- Crafts Items
function craftItem(itemid, itemmeta, itemqty)
    item = {id = itemid, dmg = itemmeta, qty = itemqty}
    peripheral.call(terminalside, "requestCrafting", item)
end

while true do
    checkItems()
    os.sleep(timeout)
end