Institute for Advanced Architecture of Catalonia, Spain

Noise pollution is a danger to human health but is often disregarded due to lack of awareness. According the World Health Organisation, when sounds are below the level of 70 dB, they can be considered safe for most living organisms regardless of length of exposure. However when the level is above 85 dB constantly for over 8 hours this can be dangerous.

The data output representation is very important, and therefore translating the audio threshold signals into melody is a great way to sonically visualize noise pollution. The noise input uses a loudness sensor connected to an ESP32-WROOM-32 board, while the receiver is an M5Stack connected to motors. The signals are transferred over WiFi between the ESP32 board and the M5Stack using Arduino.
The time update between readings is 2000ms, and the minimum/maximum values of the sensor is 0-100, with a threshold of 85.

The mini symphony will be dictated by the threshold of dangerous noise as defined by the World Health Organization, which is 85 dB. Two metal rods connected to motors will spin, one against a metal plate, and the other on the wooden base, creating different sounds. The first rod will spin when the noise input is between 0-85 dB, and once the noise reaches the threshold of 85 dB, it will activate the second metal rod to spin which will alter the melody.