LED matrix badge 8x8

Projects
1

https://github.com/formatc1702/Micro-Word-Clock/tree/master/v2

Bill of Materials

  • IC1: ATmega328P-AU (TQFP-32 package) Reichelt code: ATMEGA 328P-AU
  • IC2: DS1307Z+ (SO-8 package) Reichelt code: DS 1307Z
  • C1: 220nF ceramic (2012 metric size, 0805 imperial size) Reichelt code: X7R-G0805 0,22µ
  • C2: 2.2uF tantalum (3528 metric size, B-case) Reichelt code: SMD TAN.2,2/20
  • S1: 6.2x6.5mm SMD push button. Reichelt code: TASTER 9314
  • XTAL: 32.768 kHz crystal (3216 metric size, 1206 imperial size) Reichelt code: 32,768 CC7V-12,5
  • LED matrix: GYXM-788ASR 20x20mm 8x8 LED matrix. Probably any matrix labeled 788 should work.
  • PCB: OshPark

I am not too interested in the word clock its self, more of the Tiny board that runs the LED matrix. I would love to make animations and wear it as a badge.

I have built a few of these in the past too. They are fun and make great gifts.

Maybe it would make a good Learn to SMT solder workshop?
Maybe a group buy?

Anyone interested?

2

Cool projects. I'd be down for a build night / group buy / workshop

3

Absolutely interested, sign me up!

4

I’m in if we could do it for less than $20 a pop. I’d really like to make the word clock. I’m thinking we might have some existing SMD supplies we can raid, although not positive. I guess we’ll know when we unpack. :slight_smile:

5

I have all the smd parts at my place. We don’t have any of the expensive parts, just resistors and caps. At a glance I think we could do this for less than $20 but I can’t run it. It will be s stretch for me to help people build the piccolo.

I can send off the pcbs as a group buy if people want.

6

Super idea:

https://www.youtube.com/embed/3UxMrfjSPHA?autoplay=1&feature=oembed&wmode=opaque

7

Thanks Tom. I’m sure a few of us could manage to organize this. Is there a minimum for a group buy and what would be the timeline?

8

Since these boards are so tiny I think we could get 40 for $US13 shipped, this is the minimum as I think I can fit 4 boards in a 5x5 and a run of 5x5 is $13. Takes a month though. For $13 this is worth the risk.

This is the same cpu as the IoT board from last year, I usually buy spares, will check tonight.

9

Yea, I’d be down for this for sure. I think I’d build one that shows random words rather then a clock, but the concept is the same.

1 Like
10

Hmm, I think we should change the design to free up the serial port on the cpu so you can use external data…

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11

I think the displays will take this long too…

12

Thanks @TomKeddie I think we should order the boards. I can run the build night and set up eventbrite, put the kits together, etc.

Can someone step in and order the parts? This is mostly so I don’t order the wrong components.

13

Also ++ on the external data mod.

14

Done. Changes are on our branch GitHub - vhs/Micro-Word-Clock

I can do this. I just ordered the boards, will take 4 weeks or so. We should get 90 of them for $14!, we can split them amongst us.

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ps. these are tiny.

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If we get a confirmed parts list and where to get them, I can figure out the initial demand and order them… What would be a good battery choice?

16

Whole cow they are tiny !

Yep me too. I just want to run 8 bit animations on them and wear them as badges.

Awesome !

All of these parts are available from Digikey

We should have the caps already @TomKeddie can you check?
I am not sure how to look up the correct crystal

The LED matrix will be cheaper from http://www.alibaba.com/

17

http://www.digikey.ca/product-detail/en/ATMEGA328P-AUR/ATMEGA328P-AURCT-ND/3789455

I doubt we have those values but I can supply 10uF and 0.1uF (which are more common) free from the reels I bought in china.

@Janet seems like kits are off are people are ordering, best to get in on the digikey order I suspect.

I think this crystal will work

http://www.digikey.ca/product-detail/en/CM315D32768DZFT/300-8814-1-ND/3641385

Usually I order one set and try it out myself, this is a best effort thing here.

18

Now that the serial port is free we should be able to program the Arduino bootloader just once into these guys and use the Arduino gui to play with them. We can program the bootloader with a bus pirate.

19

I’ll like to make up kits actually just to make things easier for everyone and ensure everyone is able to put things together and get a working product… If we determine how many are required I’ll order up what is required and collect the $$…
I agree with Tom that building one first (with said parts) is better but lets hope we can hail Mary this one (or I’ll have a bunch of parts sitting in my basement)…

So if we can get a final list of parts (that will fit on Tom’s board) and a place to get em (naturally somewhere like Digikey is easier but typically more $$ than offshore) and the number of kits required (I know Tom ordered 90 boards but not sure how many people will commit to a parts kit) then I will order the parts, receive the parts, package them into kits and collect the $$ after the fact…

1 Like
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Wikified commitent. Edit this post

Name … number of kits

Mist … depends on cost. (2?)