Overview¶
We have two types of OpenSK, V1 and V2. They have almost same schematic but different casing.
Currently, only V2 is available to the market.
OpenSK V2¶
It has a metal housing with only one button in the aft area.
NOTE
The LED and User button are together. The button material is transparent, so user can see LED light through the button.
1. Switch To bootloader mode¶
After user connects the device to a computer, push and hold on the user button for more than 8 seconds and then release the button. If the red LED is breathing, OpenSK is in bootloader mode.
2. LED status¶
| LED behavior | Mode type | Trigger Method |
|---|---|---|
| Red LED is breathing | bootloader mode | Connect OpenSK to USB port, press the user button for more than 8 seconds and then release the button |
| Red LED is flashing | bootloader mode | Flash the firmware |
| No LED on | Working mode | Idle |
| R/G/B LED is flashing | Working mode | Wait for user presence when receiving FIDO command |
3. Hardware¶
The hardware schematic and PCB are shared here.
OpenSK V1¶
It has a 3D-printed case with one user button and one RESET button.
1. Switch To bootloader mode¶
After connecting OpenSK to the USB port, please insert a paper clip or a SIM-eject tool to the RESET button hole to switch it to bootloader mode. This is similar to user pushes the RESET button on the original nRF52840 USB dongle.
NOTE
The RESET button hole is covered by OpenSK label. So if you want to program the firmware occasionally, you can choose not to cover the label although we send the label to you together with OpenSK hardware.
2. LED status¶
| LED behavior | Mode type | Trigger Method |
|---|---|---|
| Blue LED is breathing | bootloader mode | Use a paper clip or a SIM-eject tool to push RESET button in RESET button hole |
| Blue LED is flashing | bootloader mode | Flashing the firmware |
| No LED on | Working mode | Idle |
| R/G/B LED is flashing | Working mode | Wait for user presence when receiving FIDO command |
3. Hardware¶
The hardware schematic and PCB files can be downloaded here.