> For the complete documentation index, see [llms.txt](https://dahl-design.gitbook.io/ddc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dahl-design.gitbook.io/ddc/fast-ddc/buttons-and-led.md).

# Buttons and LED

<figure><img src="/files/vScQ3ki3ejv6ELKewAg7" alt=""><figcaption></figcaption></figure>

{% file src="/files/j2Ylfkz8Ve0QtxQhz157" %}

* Hold button 1 and 2 together for 5 seconds to restart the controller and boot as storage device.
* LEDs are running on 3.3V data in this diagram, which works up to a certain LED count. Limit is set to 30 because more is unlikely to work. For higher LED counts use a level shifter and set up a full DDC firmware.&#x20;