CodeCell: Re-Boot

CodeCell is designed to stay compact, which means it doesn’t include physical RST or BOOT buttons like larger ESP32 development boards. Instead, the board automatically enters boot mode whenever you upload new code through the Arduino IDE.

Why There’s No BOOT Button

In most ESP32 boards, the BOOT button is used to place the microcontroller into programming mode. On CodeCell, this process is handled automatically through the USB interface, saving valuable board space and keeping the design as small as possible.

When You Might Need Manual Boot Mode

If the CodeCell gets stuck in a reset loop or fails to connect during firmware upload, you can manually enter boot mode to recover and re-flash the board.

How to Manually Enter Boot Mode

1. Connect a wire between the SCL pin and GND pin.
2. Unplug the USB-C cable and turn off the battery (if connected).
3. Reconnect the USB-C cable to your computer.
4. Re-upload your firmware from the Arduino IDE.
5. Once the upload is complete, remove the wire between SCL and GND and restore power.

After Recovery

• The CodeCell should restart normally and run your new sketch.
• If it still doesn’t respond, check your USB cable and Tools > Port settings.
• Re-enable USB_CDC_On_Boot in Tools if Serial Monitor isn’t working.

Once reflashed successfully, CodeCell will continue to enter boot mode automatically during uploads, no manual steps needed.