Here is a tiny, low power and accurate I2C sound level sensor module for Arduino, ESP32, and others. Read sound level in A-weighted decibels.
The new PCB Artists I2C methane sensor module is based on Figaro TGS2611. The sensor is compatible with ESP32, Arduino, Raspberry Pi, etc.
News and Updates on the ESP32 4G Gateway Gen.1 which features a 4G LTE modem, ethernet, RS485 and solar power with a battery charger.