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DotStar Matrix 8x32 up & running
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DotStar Matrix 8x32 up & running

by mouha on Wed Dec 23, 2020 2:54 pm

Hi,

while this may be obvious I've received the Flexible 8x32 matrix and we are looking at each other the matrix and I wondering what
is the next step.
Behind are 2 colored connectors male & Female in addition to the power. I have carefully looked at this page :
https://learn.adafruit.com/adafruit-dot ... onnections but nothing about these connectors.
There are named pins from the matrix but not readable as they are masked by some sticky glue.

While I could set up a Neomatrix with a fadecandy, here I'm stucked.

My question may seems obvious but how to set this matrix running with a PI 3 ?

mouha
 
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Joined: Tue May 20, 2014 6:50 pm

Re: DotStar Matrix 8x32 up & running

by mouha on Sat Dec 26, 2020 8:15 am

Bump !
If usefull I'd add that I manage the Neomatrix with a Pi3 and/or with a Fadecandy as well.

mouha
 
Posts: 15
Joined: Tue May 20, 2014 6:50 pm

Re: DotStar Matrix 8x32 up & running

by mikeysklar on Sun Dec 27, 2020 9:05 pm

mouha,

The 8x32 Matrix you picked up is not a DotStar device, but a NeoPixel. I think that might help you navigate to guides that are more suited. Our NeoPixel displays typically have three connections 5v, GND and DIN. There is also typically a DOUT only used when chaining more LEDs.

Start with this guide:

https://learn.adafruit.com/easy-neopixe ... ary/wiring

mikeysklar
 
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Re: DotStar Matrix 8x32 up & running

by mouha on Mon Dec 28, 2020 5:59 am

Hi Mikeysklar,

Thanks for you answer. However, from my order I can read that it's a :
"Flexible Dotstar Matrix 8x32" what makes you think it's a Neopixel please ?

Moreover I'm still saying that the 2 connectors on the back are made of 4 wires not 3.

mouha
 
Posts: 15
Joined: Tue May 20, 2014 6:50 pm

Re: DotStar Matrix 8x32 up & running

by mikeysklar on Tue Dec 29, 2020 2:33 pm

I apologize for my confusion.

There 8x32 DotStar datasheet and the panels backside shoudl show your input connectors to the Pi's SPI clock and data in lines. I think this describes it well. Let me know if you need more info.

77C90C10-20A3-423A-B333-24C0D5E72D93.jpeg
77C90C10-20A3-423A-B333-24C0D5E72D93.jpeg (585.57 KiB) Viewed 72 times


Connect the strip 5V pin to the board 5V
Connect the strip GND pin to board GND
Connect the strip CI (Clock input) and DI (Data input) to the board’s SPI SCK and MOSI pins (if using an SPI bus) or any two digital pins (if “bitbanging” the signals). We’ll explain this in more detail in the “Software” section of this guide.


https://cdn-shop.adafruit.com/product-f ... asheet.pdf
https://learn.adafruit.com/adafruit-dot ... s/overview

mikeysklar
 
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Re: DotStar Matrix 8x32 up & running

by mouha on Fri Jan 08, 2021 5:53 am

Indeed this is what I was looking for.
thanks mikeysklar
Even though from guide & posts it's not recommanded to follow colors I'll follow on wires order to plug CI & DI .

And yes I have another question, I don't know if it worth a new topic: I've seen the dotstar library for Python but this is about very basic animations:

Is there a way to have more graphical effects using the Dotstar 8x32 like rain, lava,etc as you can do with processing ?
Maybe there is possibility to use processing with this matrix ?

mouha
 
Posts: 15
Joined: Tue May 20, 2014 6:50 pm

Re: DotStar Matrix 8x32 up & running

by mikeysklar on Fri Jan 08, 2021 2:45 pm

On the Arduino (Processing) side we are leaning on the Adafruit-GFX-Library + Adafruit_DotStarMatrix libraries for the fancy graphics.

On the CircuitPython side you will want to checkout our Pixel Framebuf library.

https://learn.adafruit.com/easy-neopixe ... -and-setup

mikeysklar
 
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Please be positive and constructive with your questions and comments.