12 LED Charlieplexed Snowfall with AtTiny85

[strykeroz]

If you want, I can dig up my version which (hopefully ^#) is correct.

^# I have not yet made up boards since correcting the footprint.

That would be great - thanks.  And happy to be the lab rat for sure.

Cheers ! Geoff

[Coding Badly]

I have no idea how to extract the one part so I'm attaching the entire library.

PJ-102A is the part number.  It's the Eagle Package for this...
http://www.digikey.com/product-detail/en/PJ-102A/CP-102A-ND/275425

I believe it is the same or very similar to the one you are using.

[daaf1984]

Time flies....

I should have posted my version long time ago...
So I will do it right now

Ik looks great Strykeroz! You did a great job.

Here are mine:

Measurements: 1x29 Cm
Used components:
• 1 ATTiny 45 @ 8Mhz (SMD SOIC)
• 1 100 nF capacitor (SMD 0805)
• 5 100 Ohm restistors (SMD 0805)
• 20 diffuse cold white LEDs 3mm

[daaf1984]

I'd just took one that wasn't cleaned up...
You can see the flux around the solder..

Here an other picture:

[darrenmathews]

I just read this entire thread. I'm impressed, you guys do awesome work.

How can I get the pcb files to have my own made?

[strykeroz]

Hi,

Thanks for your interest.  I've not actually gone back to this project for several months - time flies - have a big box of LEDs sitting beside me here that needs to be assembled before December though 

How can I get the pcb files to have my own made?

I've just updated github with the EagleCAD schematic and board as well as a zip file that can be sent to Seeed Studios (that's where I had mine made) without any further work.  Note this is still with the bigger pad Adafruit 2.1mm component discussed above and produces a board in the sick-of-beige 50x31mm shape.

Not sure if Dave has published his somewhere as yet...

Cheers ! Geoff

[daaf1984]

Hi all,

Funny, here just the same, only finished 5 of them and still need something to weatherproof it.

But I did posted my layout on the Fritzing site:
http://fritzing.org/projects/charlieplex-snowfallshooting-star-20-leds

Take a look at it and have fun with it!

Dave

[strykeroz]

...and still need something to weatherproof it.

Hi Dave

I've had some success with some test circuits embedding them in casting resin (here's a link to the brand I bought but you're sure to have an equivalent local to you).  After several months the resin remains clear, and the circuit protected.  I can see some of the circuitry has changed colour due, I presume, to corrosion where I didn't get all the flux off. 

Overall I think that's a method I'll continue to use for weatherproofing LED circuits, and my results can only improve.

Cheers ! Geoff

[daaf1984]

Hi,

That's a good idea!! I have clear resin here, so I will do a test run.

Did you made a mold or brushed it over?


Dave

[strykeroz]

Hi Dave, for my tests I actually used small circuits which fit nicely into icecube trays...so I had a mold that did the job just great. Maybe you could form a mold out of Sugru or similar for yours?

Geoff

[daaf1984]

After some considerations, I decided to use clear tubing for weatherproofing.
Just seal the bottom and top with acrylic rod.

If something occurs, it's easier to re-solder, than using resin.