This breakout board adds a Nordic nRF54L15 Bluetooth Controller inside the speaker box of the Waveshare ESP32-S3-LCD-Touch-1.85C for LE Audio.
It uses the nRF54L15 module from Holyiot, e.g. available from AliExpress, as it is to solder due to it's castellated edges.
In addition to the full HCI UART, an additional pin is connected for time sync, required for True Wireless Stereo (TWS) in LE Audio.
After soldering, it can be mounted on the Waveshare box to provide power. It can then and be programmed with an SWD programmer via the provided pin-header through-holes.
UART functions as seen from nRF54L15
| ESP32-S3 GPIO | Function | nRF54L15 |
|---|---|---|
| 1 | nRESET | nRESET |
| 7 | TX | P1.04 |
| 6 | RX | P1.05 |
| 12 | RTS | P1.06 |
| 13 | CTS | P1.07 |
| 13 | Time Sync | P1.11 |
To fit the add-on inside the Waveshare box, you need to:
- extend the hole around the connector in the middle plastic cover
- remove one brass stand-off
