Buttons and LEDs

SliceMK keyboard dongles and PCBs have a number of buttons and LEDs.

• Reset button
• User button
• Charging LED
• Indicator LEDs

The Raytac dongle has a user button but no reset button.

Keyboard PCBs have both a reset button and a user button. If you look straight at the USB C port with the keyboard (and keycaps) facing up:

• The reset button is on the right of the USB C port.
• The user button is on the left of the USB C port.

tip

To help you remember which button is which, remember that right and reset are both 5-letter words that start with the letter r.

Reset Button

The reset button functionality is controlled by the bootloader.

• Pressing the reset button exactly once will reboot the device.
• Pressing the reset button twice within 500ms will place the device in bootloader mode.

User Button

The user button functionality is controlled by the firmware.

• On centrals, the user button is assigned to the &bootloader key. Pressing it once will place the device in bootloader mode.
• On peripherals, the user button will put the device in "system off" state. This can be useful for preventing the keys from being pressed when transporting the keyboard, for example. Pressing the reset button will turn the device back on.

tip

If you are unable to put your dongle in bootloader mode by pressing the user button, the firmware may have encountered an error. You can try triggering bootloader mode by plugging the dongle in while holding down the button (and releasing it once the dongle is plugged in).

Keyboard Charging LED

All keyboard PCBs have a blue LED to indicate charging status.

LED	Description
Off	USB is not connected and the keyboard is running on battery power.
Solid	The battery is currently charging via USB.
Dim	If the LED is dim and the brightness is constant, battery is full and charging has completed. If LED is dim but pulsing once a second, please check that the battery is properly connected.

Keyboard/Dongle Indicator LEDs

• Newer keyboard PCBs have four RGB "underglow" LEDs.
• The Raytac Dongle has a single blue "legacy" LED.
• Older keyboard PCBs have a single red "legacy" LED.

RGB LED	Legacy LED	Description
Brief red	Brief	The device has reset and firmware is starting.
Solid green	Slow pulses	This indicates that the device is in bootloader mode. The connected computer will display a virtual drive for updating the device firmware.
Solid red	Rapid blinks	This can indicate one of several things: If you are attempting to enter bootloader mode, the device is unable to detect the USB connection. Please try a different USB cable, flipping the USB C port, and/or a different USB port. If you just copied a UF2 firmware file to the virtual drive, then the device is in the process of updating the firmware. Please keep the device connected and wait for flashing to complete (LED will turn off).
Solid White	Solid	This indicates that the keyboard testing logic failed, possibly due to a hardware issue. Please get in touch for additional troubleshooting instructions.