Measure decibels using a piezo - Sensors - Arduino Forum
Arduino Sound Level Meter - Measure Sound/Noise Level in dB with Microphone and Arduino
Sound Level Meter IoT using ESP8266, SparkFun Sound Detector and Arduino - YouTube
In-Depth: Interface Sound Sensor with Arduino and Control Devices With a Clap
Arduino decibel meter. Arduino Sound Level Meter
DFRobot Gravity Analog Sound Level/decibel/noise Meter 3.3~5V Compatible with arduino for environmental noise testing/monitoring|noise meter|noise decibel meterdecibel level meter - AliExpress
Sound Level and Intensity Meter using Sound Sensor & Arduino - YouTube