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192:LED redesign

Ultra tiny (15.8mm x 14.8mm) smart USB RGB LED display/matrix

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Compared to the original #192:LED design. Nearly everything did change

  • smaller: 15.8mm x 14.6mm
  • No complicated Multiplexing anymore! LEDs are WS2812 style ones in a metric 1515 package
  • smarter: MCU is a SAMD21
  • USB: quite more convienat and easier to connect
  • Bootloader is same as on Adafruit's Trinket M0
    • Easy Arduino IDE support
    • Easy Circuit Phython support
    • Using of Adafruits's Neopixel Library 
    • Programming and Powering via USB

  • Someone asked for some IR pictures....

    Alex07/28/2019 at 01:42 0 comments

    You may already saw them on Twitter. Thanks to fablab Munich I could take some IR pictures of a running matrix.

    Front at 15% brightness white:
    ImageBack at 15% brightness white:

    ImageFront at full brightness after ca. 5 sec. running... Than I unpluged it.

    ImageSo it should not run a full brightness for a long time. I am thinking to use the SAMD21'S integrated Temperature Sensor to limit the Brightness to Maximum Board (/MCU) temperature - maybe to 70-80°C.

  • Test/programming Jig ​

    Alex07/10/2019 at 21:34 0 comments

    This small programming Jig was quite handy today

    I marked the positions of the Test pins in new Layer in eagle. Than I exported this Layer and the Outline as dxf. With this dxf and some work in Fusion i ended up with this small jig. Due to it small size (~3x3cm) it also prints in ~1/2hr. After redrilling the holes the test pins can be pushed in the plastic.

    Best part: it worked: And I now have the Trinket-M0-USB-Bootloader on the board. And now I can program it via USB! Pictures of working board will follow tomorrow. 

    Here is a picture of the whole setup needed to burn the bootloader. Beside the JIG some power source and a Programmer. I used the Atmel ICE. 

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Discussions

Krister Johansson wrote 3 days ago point

How did you soder it?

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Steve Shaffer wrote 08/21/2019 at 18:01 point

Good stuff! Any sellers of that LED on alibaba you'd reccomend?

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Alex wrote 07/28/2019 at 01:30 point

Sorry for the late reply: Yes these LEDs do look like the one I ordered. MY listing is not available anymore.

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Jonas Otto wrote 07/13/2019 at 17:53 point

Hi! Could you share your PCB footprint for the LEDs?

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Alex wrote 07/28/2019 at 01:31 point

Sorry for the late reply.... I will upload it tomorrow..but it is basically according to the datasheet.

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Xasin wrote 07/12/2019 at 12:28 point

HOLD ON
Tiny WS2812-Style LEDs? Sign me up for those, what part number can I find them as???

The smallest DigiKey holds is a 3535 package. This size of LED would be fantastic for some of my projects though, as much better tiny indicators <3

By the way, I love that programming jig. Nice way to save some board space and leave out a connector or SOIC-Bite :>

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Alex wrote 07/28/2019 at 01:32 point

Thanks! You can fin the LEDs as SK6812-EC1515 on aliexpress.

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Jan wrote 07/12/2019 at 10:37 point

I soooooo wanna build one of those :)
Did you use a stencil to apply solderpaste? I imagine placing all those LEDs is quite the tedious work?

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Alex wrote 07/28/2019 at 01:34 point

Yes I used the stencil also made by Aisler for the solder Paste. Placing the LEDs was indeed quite difficult. I had to drop them on the PCB, because the tweezers tips do not fit between two LEDs.

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arturo182 wrote 08/02/2019 at 10:50 point

Mad respect!

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Stephen Ludgate wrote 07/12/2019 at 09:01 point

Brilliant work Alex!

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davedarko wrote 07/03/2019 at 22:08 point

Erm, isn't that 195:LED now?

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Alex wrote 07/03/2019 at 22:39 point

196:LED to be exactly. There is also one discrete LED beside the APA102 on the back. But I decided that only LED chips on the LED side do count.

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de∫hipu wrote 07/03/2019 at 21:55 point

Yay Python!

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