ESP-NOW Based Decentralized Low Cost Voice Communication Systems For Buildings
Amazon.com: MAX9814 Electret Microphone Amplifier Board Module MIC Auto Gain Max 40dB/50dB/60dB Frequency 2.7V-5.5V with Pins for Arduino : Electronics
esp32_audio/README.md at master · atomic14/esp32_audio · GitHub
MAX9814 Electret Microphone Amplifier Module AGC Auto Gain Control, ESP32 WLED | eBay
MAX9814 Microphone in Arduino - arduino for beginners - with code - YouTube