furnaceMCU

local redst = component.proxy(component.list("redstone")())
local furnaceSide = 3 --replaceme

local function sleep(timeout)
    checkArg(1, timeout, "number", "nil")
    local deadline = computer.uptime() + (timeout or 0)
    repeat
        computer.pullSignal(deadline - computer.uptime())
    until computer.uptime() >= deadline
end

while true do
    if(redst.getComparatorInput(furnaceSide) >= 15)
        for i = 1, 3
            computer.beep(1000, 0.5)
            sleep(0.4)
        end
    end
    sleep(27)
end