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DFRobot Analog Sound Level Meter on ESP32

https://www.dfrobot.com/product-1663.html

https://wiki.dfrobot.com/Gravity__Analog_Sound_Level_Meter_SKU_SEN0232

https://fr.aliexpress.com/item/32846247596.html?spm=a2g0s.9042311.0.0.61346c375GJr6S

PINOUT

wire	signal
blue	Analog output IO34
red	VCC (3.3V - 5V)
black	GND

Upload data directory to SPIFS

platformio run --target uploadfs

Plotly

• https://plot.ly/javascript/streaming/

Kalman Filter

https://github.com/denyssene/SimpleKalmanFilter/blob/master/src/SimpleKalmanFilter.cpp

Vu meter

• https://fr.wikipedia.org/wiki/VU-mètre
• https://fr.wikipedia.org/wiki/Peak_Programme_Meter