A LITTLE BOARD WITH SOMETHING TO SAY
Small signal.
Shared frequency.
A track in flash. A radio over Wi-Fi.
Tune in, watch the music move,
and send a little color back.
Loading track…
Local recording
Checking the S3’s connection…
POSTCARDS
FROM THE BOARD
Measured on the S3
Room to keep experimenting
0 messages received
Follow the signal
ESP32-S3 → Cloudflare Realtime SFU → your browser. The audio comes from the board’s flash. Spectrum frames are prepared from the same recording and sent by the board on its playback clock. Random values are simulated; Wi-Fi signal and free memory are measured.
The board connects directly over Wi-Fi; USB supplies power. Audio, spectrum, telemetry, and LED commands travel through the SFU. There is no speaker attached to the board. Spectrum and audio use different transports, so their arrival times can differ slightly.
Connect to see stream diagnostics.