ItemCheck

-- Output Redstone Signal when ID changes states
local altar = peripheral.wrap("tealtar_3")

function getStack() return altar.getStackInSlot(1) end

function isOrb(stack)
    if stack == nil then return nil end
    if string.find(stack.id, "BloodOrb") then return true end
    return false
end

function hasChanged(stack)
    local id = stack.id
    if getStack().id == id then return true end
    return false
end

while true do
    sleep(0)
    redstone.setOutput("top", false)
    local stack = getStack()
    print("Stack: "..stack.id)
    if getStack().id ~= stack.id then
        redstone.setOutput("top", true)
        sleep(0.1)
    end
end