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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

  • Test/programming Jig ​

    Alex5 days ago 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

Jonas Otto wrote 2 days ago point

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

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Xasin wrote 3 days ago 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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Jan wrote 3 days ago 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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Stephen Ludgate wrote 3 days ago 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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