Recent events have reminded me of the importance of early detection when dealing with alien invaders. You can’t just let them land in your yard and promise not to take over the earth. Aliens don’t value yards the way we do, so you can forget about them valuing human life. With this circuit, you can remain aware of exactly how much sunlight is being blocked by an approaching alien warship. Ignore the radio broadcasts. The mind-controlled announcers will claim it is a medical supply vessel, but we know an unimaginably futuristic, alien, and complex warship when we see one.
Bottom Line: LEDs + piezo buzzer = not dead from alien attack.