What I came up with was the “Hello Light,” named by my son to signify the fact that you say hello to it and it lights up. It uses an Arduino Nano along with an electret microphone stuffed into a wooden enclosure near the bottom of the assembly to measure ambient noise, then signals strips of RGBW lights to progressively light up depending on sounds levels. In alarm mode, if the sound level exceeds a certain threshold, it flashes blue and red to signify things are too loud.
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