Make Your Doorbell Smart With an ESP8266 : 7 Steps (with Pictures) - Instructables
Amazon.com: ACEIRMC ESP8266 ESP-12 ESP-12F NodeMcu Mini D1 Module Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino,Compatible with WeMos D1 Mini (10pcs) : Electronics
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Make Your Doorbell Smart With an ESP8266 : 7 Steps (with Pictures) - Instructables
Turn an ESP8266 WemosD1Mini into an audio notifier for Home Assistant: Play MP3, TTS & RTTL - Share your Projects! - Home Assistant Community
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IoT Sound Level Monitor with ESP8266 & Sound Module