MysticalAgriculture "Crafter ItemCounter"/Computer ID:28

while true do

sleep(0.1)

    crafter = peripheral.wrap("left")
    items = crafter.list()
    totalCount = 0

        for slot, item in pairs(items) do
            totalCount = totalCount + (item.count or 0)
        end

        if totalCount >= 500 then
        redstone.setOutput("back", true)
        else
        redstone.setOutput("back", false)
        end
end