The 2021 Christmas Card

Happy Holidays!

Is that time of the year again, and a new Christmas Card is born.

As earlier years we have made a PCB card and programmed it to assist with the holiday spirit creation 🙂


Each year they have a different look.

This year we created a Gingerbread-woman. As you can see the body is made of pure FR4.

Almost ready to ship out!
The solder-mask is white and we used that to add some details 🙂
Metal hair!


The schematic for the circuit is rather simple, and looks like this:


The Christmas card is compatible with the previous used firmware used on the other side of this URL.

Creative Commons License

And remember that this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

How to program it?

The main “brain” is an ATtiny10, which can be programmed through TPI.

Remember that the programming voltage has to be around 5 volts.

The Christmas Card can handle this, but the battery cannot.

So an external power source has to be present (and the battery cannot).

The programming happens through a tag-connect-header designated P1 in the schematics.

From the first “benchtop” test!


The “mini squid” cable from the ATMEL ICE can be used to connected the different signals according to the pinout given here.

Signal – Mini-squid pin
GND – 2
VCC – 4 // Note that this does not supply the card!
!RST – 6

The Stand

As last year does the card stand in a “snow mound” that looks like the image below. It was in in house designed and 3D-printed.

The Result

?? Merry Christmas! ??

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