Original receiver schematics and source code from https://oshwhub.com/sunnygold/esp32s3-si4732-shou-yin-ji. Newer version of the Chinese firmware is available at https://github.com/zhang-chong/4732mini/
The receiver uses ESP32-S3 and SI4732 and is based on the following projects:
- FM Radio project LilyGO T-Embed ESP32 S3 (source) by Volos Projects, that uses the TEA5767 FM radio module
- ESP32 OLED_ALL_IN_ONE sketch by PU2CLR (Ricardo Caratti) that uses SI4735-D60 or Si4732-A10
- Port of ESP32 OLED_ALL_IN_ONE by Ralph Xavier to Lilygo T-Display S3 using the Volos interface
- Open source (CC BY-NC-SA 3.0) hardware and software (based on Ralph Xavier's work licensed under the MIT License) by Sunnygold.