CC Pocket Alarm

local speaker = peripheral.wrap("back")

local last_hour = -100.0

while true do
    local current_time = os.time()
    if current_time >= (last_hour + 1) or math.abs(current_time - last_hour) > 3 then
        for i=1, math.floor(current_time) % 12 do
            if current_time >= 12 then
                speaker.playNote("cow_bell", 1.0, math.floor(current_time) % 12)
            else
                speaker.playNote("bit", 1.0, math.floor(current_time))
            end
            sleep(0.3)
        end
        last_hour = math.floor(current_time)
    end
    term.clear()
    print("Time: " .. tostring(current_time))
    sleep(1)
end