Particle Sound level meter
*** PDM (pulse-density modulation) library for Particle Gen 3 devices (Argon, Boron, Xenon) ***
condenser microphone Sensitivity 3.7 to 46 mV/Pa. 200 V bias.
NoiseScout unattended sound monitoring
Arduino FFT library (ELM-ChaN ffft) discussed here
Arduino free-run mode for 9.6 kHz analog sampling
Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H
More AF FeatherWing products from Adafruit and from Particle
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.jpg "Particle products as of 2023")
 (4).png "Resolving Particle device problems")
.png "Using your Xenon without particle mesh")
.jpg "Particle Boron / Argon Xenon BLE (low energy bluetooth)")
.png "Blynk IoT 2.0 - Particle TCPClient HTTP GET POST")
.png "Particle Boron cellular signal strength & quality")