Home > Devices > Biscuit Crumb

Biscuit Crumb

The Biscuit Crumb is a compact, single-chip Biscuit built on the ESP32-C5. It gives you the full set of WiFi and Bluetooth scanning tools in a smaller form factor, controlled entirely from the Biscuit Manager app on iOS or Android.

Single-Chip Design

Unlike the Pro and Ultra, the Crumb runs everything on one chip — the ESP32-C5 handles both wireless scanning and the BLE connection to your phone directly. There is no secondary WROOM chip.

The Crumb has:

  • Dual-band WiFi 6 scanning (2.4 GHz and 5 GHz)
  • Bluetooth scanning and attacks
  • 6 RGB LEDs that respond to active scans and attacks
  • Serial number provisioning via on-board SPI flash — each unit has a unique BSK- serial
  • Evil Portal and Karma with portal templates and captures stored on the on-board SPI flash
  • No SD card slot

The on-board flash is also used for captive-portal storage, so downloading and running an Evil Portal or Karma template does not require an SD card.

Connecting

Connection works the same as any Biscuit:

  1. Power on the Crumb
  2. Open the Biscuit Manager app
  3. The app scans for nearby Biscuit devices — tap yours to connect
  4. The dashboard shows your device info and scan controls

For the full walkthrough, see the First Connection Guide.

Firmware Updates

The app shows the Crumb’s single C5 firmware version on the Dashboard and Device screens. Its Firmware Update screen contains one C5 update step because the Crumb has no WROOM chip.

See Firmware Updates for update instructions.

LED Indicators

The Crumb has 6 RGB LEDs that give real-time feedback:

Color Meaning
Breathing blue Scan in progress
Breathing red Attack in progress
Orange (solid) OTA update ready
Orange (blinking) Installing OTA update
Red/blue flash Jam detection alarm
Off Idle

Brightness and LED on/off can be adjusted from the app Settings.

The ring in the app

While your Crumb is connected, its picture on the Dashboard and Device screens lights up to match the real ring — the same effect, in your own colours, switching as you start and stop a scan or an attack. Change an effect under Settings → LED Effects and the picture follows.

The picture stays dark while the Crumb is disconnected, or when you turn the LEDs off.

Badge Mode

The Crumb can be started as a wearable detector: it disconnects and watches the airwaves on its own, calling out attacks and surveillance gear with the LED ring as its only readout. Because it has no screen and no buttons, the only way out is to power-cycle it.

See Badge Mode for the full guide and the LED key.

Troubleshooting

Can’t find the Crumb in the app Make sure Bluetooth is enabled on your phone and location permission is granted. The Crumb advertises as “Biscuit Crumb” — if you see it in your phone’s Bluetooth settings but not the app, force-quit and reopen the app.

If you started Badge Mode, the Crumb stops broadcasting on purpose and nothing can see it. Power-cycle it to bring it back.

LEDs not lighting up Check that LED feedback is enabled in app Settings. The LEDs only activate during active scans or attacks.

For general connection issues, see Troubleshooting.