Building wired TOTEM (WIP)

Parts

• 3D printed parts (https://github.com/GEIGEIGEIST/TOTEM/tree/main/case/USB/STL)
  • Left top plate
  • Right top plate
  • Left bottom plate
  • Right bottom plate
• 7mm M2 standoffs x 8
• 6mm M2 countersunk screws x 16
• 8mm rubber feet x 8
• PCB (https://github.com/GEIGEIGEIST/TOTEM/tree/main/PCB)
• Seeed XIAO RP2040 x 2
• TRRS cable x 1
• TRRS jack PJ320A x 2
• USB Type-C cable x 1
• Alps SKHLLCA010 x 2
• 1N4148 diodes x 38
• Kailh Choc switches PG1350 x 38
• 1u Choc keycaps x 38

Assembly

1. Flash XIAO RP2040 with the firmware from https://github.com/GEIGEIGEIST/TOTEM/tree/main/firmware/QMK first to make sure it works.

Long press the B button on the XIAO RP2040 and connect the XIAO RP2040 to the computer via USB to enter bootloader mode. Then you will see it’s being recognized as a storage device. Drag the firmware file to the device to flash it. You should do this for both XIAO RP2040, and drag the corresponding firmware file to the XIAO RP2040.

2. Solder XIAO RP2040 to the PCB on both sides.

3. Solder diodes and switches to the PCB on both sides.

4. Solder PJ320A to the PCB on both sides.

5. Solder Alps SKHLLCA010 to the PCB on both sides.

References

• TOTEM
• TOTEM case
• TOTEM PCB
• TOTEM firmware
• TOTEM build guide