Skip to content

Parts List

Conor Patrick edited this page May 21, 2018 · 23 revisions

Not including the programmer, each U2F token should cost about $5 in parts.

SMT Parts

You need these 8 surface mount parts per U2F token which can all be purchased from Digikey or Mouser (totals ~$3 per board):

Thank you to thenoviceoof for upgrading the parts to be more hand-solder friendly.

Programmers

If your part has never been programmed, you do not need a programmer. You can use the build in EFMUB1 USB HID bootloader. You will have to disable extra functionality like the user RNG, SEED, wink, and HID locking (none of which is necessary for U2F). Fair warning: if something messes up and the bootloader gets overwritten, you will need a programmer to recover.

You can also use any Arduino board as a programmer. See this repository to get going.

If you are interested in getting a programmer, read the following. You can use any EFM8 Silicon Labs development board. It is available in Digikey and Mouser ($30-40).

Or you can buy the 8 bit Silicon Labs debugger. It is available in Digikey and Mouser ($35).

Tools

You can also use an air solder gun, paste, and stencil which I find a little easier. You can order a $5 stencil from OSH Stencil.

PCBs

Here I will provide links you can use to purchase PCBs. You can order from Osh Park and get PCBs for about $1.5 each. Warning: They are 1.6 mm thick which is slightly too small and will require some electric tape or something to compensate thickness.

You can order panelized or non-panelized from Dirty PCBs. Free shipping is available and costs about $3.5 or $1.13 per PCB respectively. You can get a long lasting ENIG finish for an extra $15.

Alternatively you can upload the source to your preferred PCB vendor.

Thanks to gregose for panelizing the boards.

Stencils (optional)

Link to OSH Stencils for a stencil. Note these will only work with the boards linked above, and not what is currently in git repo.