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SMT version of Ladyada's (Conway) Game of Life

PostPosted: Sat Apr 23, 2011 3:08 am
by victzh
I designed small 2-layer PCB for a version of Ladyada Game of Life (gentle forum filter complains about URLs, so use Google). The board is two-side, front has 16 0603 LEDs on it, back has ATTiny861, 4 resistors, 4 FETs, 2 capacitors and one button.

The board was prototyped through Laen's PCB group order (no URL for you here either ;-).

One side with TQFP processor was soldered on a hot plate, 16 LEDs on the other side soldered manually.

The board's firmware is not ready yet - the processor is quite different from the original ATMega 168 - less pins, less memory, fewer timers etc.

The LED activation is implemented as 4 x 4 matrix with columns connected through FETs and rows connected through limiting resistor directly to ATTiny. The idea is to activate one column at a time - thus FETs, and light up to 4 rows for every column - so we can get away with direct connection of row to processor pin.

The board is alive - first test lights the LEDs and senses the button.

Next step is a full port of original firmware with communication protocol - the boards can be connected to form large Game of Life field.

I'd appreciate suggestions on cheap 4-wire side connector.

Re: SMT version of Ladyada's (Conway) Game of Life

PostPosted: Mon Apr 25, 2011 12:59 am
by rsdio
Photos?

Re: SMT version of Ladyada's (Conway) Game of Life

PostPosted: Mon Apr 25, 2011 7:48 am
by victzh
As soon as my account gets the right to post an external URL. I'll try later today.

Re: SMT version of Ladyada's (Conway) Game of Life

PostPosted: Mon Apr 25, 2011 1:37 pm
by arhi

Re: SMT version of Ladyada's (Conway) Game of Life

PostPosted: Mon Apr 25, 2011 2:06 pm
by victzh
Yep, but 2 times smaller.

Image
Image

Re: SMT version of Ladyada's (Conway) Game of Life

PostPosted: Mon Apr 25, 2011 2:16 pm
by arhi
so I found the wrong site or you have not added this smt version on that site yet (or I failed to find the proper link :( )

Re: SMT version of Ladyada's (Conway) Game of Life

PostPosted: Mon Apr 25, 2011 2:24 pm
by victzh
No, you found the original site, mine is unofficial SMT version of Ladyada's one. It is in the works still - different MCU requires very extensive code modification.

I would like Ladyada make it in volume, but am not sure about the audience. The throughhole version is good for home assembly, to solder mine you need to have a hot plate.

Frankly, for me it is easier to do SMT than throughhole, but it definitely looks frightening.

Re: SMT version of Ladyada's (Conway) Game of Life

PostPosted: Thu Apr 28, 2011 2:38 am
by rsdio
Congrats! Smaller is way cooler! ... and purple!

Re: SMT version of Ladyada's (Conway) Game of Life

PostPosted: Fri Apr 29, 2011 10:20 am
by victzh
Purple is thanks to Laen's exquisite taste!

Now juggling LED lighting code and transmission - they both seems to be time critical, so need to use timer interrupt extensively.

I have many very small designs, some are insanely dense so it is pretty hard to populate by hand. I still plan to publish them all - it is not my strongest side so far. To design and program is much more interesting.

As an example of another SMT redesign - http://majolsurf.net/wordpress/?p=1582