DIY ESP32 PCM5102 Programmable Bluetooth Speaker | How to make your own bluetooth speaker - YouTube
DOIT ESP32 Development Board WiFi+Bluetooth esp32s similar to esp8266 diy iot rc toy kit speaker|board wifi|bluetooth bluetoothboard board - AliExpress
10] DIY DSP Bluetooth Speaker with ESP32 - YouTube
Are you ready to play with Do-It-Yourself Alexa Speaker, WiFi SIP phone, WiFi walkie-talkie, Internet Radio player and broadcasting? Then the Open Source hardware ESP32-ADF is the right board to start with!