Ho ho ho!
Is that time of the year again, and we have made a new Christmas Card.
The Schematic are almost as simple as possible and looks like this:
As you can see this is quite similar to last years, but with some modifications. We have among other things removed the possibility to add a diode to protect the circuit from wrongly inserted batteries.
Testing revealed that the circuit could handle wrongly inserted batteries without a diode.
The Christmas card uses the same firmware as last year, which can be found on the other side of this URL.
And remember that this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
How to program it?
The “brain” on the Christmas Card is an ATtiny10. And that can be programmed through TPI.
And remember that the programming voltage has to be around 5 volts.
The Christmas Card can handle this, but the batteries cannot.
So an external power source has to be present (and the batteries cannot).
The “mini squid” cable from the ATMEL ICE was used to connected the different signals according to the pinout given here.
Signal – Mini-squid pin
TPICLK – 1
GND – 2
TPIDATA – 3
VCC – 4 // Note that this does not supply the card!
!RST – 6
The Christmas Card is equipped with skis.
They are the same as last year and printed in-house.
You can print them yourself with the STL file here.