• SubGHz
  • Intermediate
  • 5 min
  • Serial CLI

Recipe · Intermediate · SubGHz

How to record a SubGHz signal

Use SubGHz record to capture symbols from a CC1101 receiver and save them to LittleFS.

CC1101 sub-GHz radio signal workflow.
Start with read-only checks, then move to write, replay or automation only when the setup is understood.
Step 1

Commands

Use the shortest command path that matches the documented firmware workflow. When a mode needs setup, follow the prompts shown on first entry.

Result

What it means

The command path is working when the target responds and the firmware prints the expected menu, status or captured data.

Troubleshooting

  • Re-enter the mode setup when pins or peripherals are not already initialized.
  • Check common ground and target voltage before blaming software.
  • Prefer Serial CLI for long captures or high-volume output.
  • Repeat the read or capture to confirm stability.

Next steps

  • Save the output in your project notes.
  • Compare the result with the full wiki page for mode-specific details.
  • Create a shorter alias if you repeat this workflow often.

SubGHz recording to LittleFS FAQ

What does SubGHz record save?

It captures a pulse/symbol sequence from the CC1101 data path and saves it to LittleFS so you can review or replay the lab capture later.

How do I improve recording reliability?

Use scan or sweep first to find the frequency, fine-tune around the strongest peak, keep the remote close, and prefer USB Serial for lower-latency logging.

What are the limits of a recorded capture?

The firmware captures a bounded symbol sequence, so noisy, long, rolling-code or protocol-specific transmissions may need repeated captures and manual comparison.

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