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Are these two 8x16 LED Matrix backpacks functionally identic
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Are these two 8x16 LED Matrix backpacks functionally identic

by BlinkyKB on Tue Nov 19, 2019 1:49 am

Other than the fact that one will directly mount 2x 8x8 matrices and the other will not, are these two backpacks functionally the same?:

Adafruit 16x8 LED Matrix Driver Backpack - HT16K33 Breakout
PRODUCT ID: 1427
https://www.adafruit.com/product/1427

and

Adafruit 8x16 LED Matrix FeatherWing w/o Matrices
PRODUCT ID: 3090
https://www.adafruit.com/product/3090

I want to use several backpacks to create a large dot matrix display, and I want to run it through I2C from a Grand Central using CircuitPython, can I do that?

And, can I control the brightness? The example code suggests I can but the product description of the non-featherwing backpack says, "Note that the driver can turn LEDs on and off but does not have the ability to individually PWM dim them." So, I am confused....

Thanks in advance for the help!

BlinkyKB
 
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Joined: Wed Nov 06, 2019 4:51 am

Re: Are these two 8x16 LED Matrix backpacks functionally ide

by dastels on Tue Nov 19, 2019 12:07 pm

Yes. Look at the schematics. The only real difference is the LED array and the feather connections.

Dave

dastels
 
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Re: Are these two 8x16 LED Matrix backpacks functionally ide

by BlinkyKB on Tue Nov 19, 2019 12:10 pm

dastels wrote:Yes. Look at the schematics. The only real difference is the LED array and the feather connections.

Dave


Ok, thank you.

BlinkyKB
 
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Re: Are these two 8x16 LED Matrix backpacks functionally ide

by adafruit_support_carter on Tue Nov 19, 2019 2:33 pm

As another option, there's a double backpack version for the 1.2" LED matrices. Various colors, square or round pixels, see here:
https://www.adafruit.com/category/326

You can control brightness globally, but not per pixel.

If you want individual pixel brightness control, consider the charlieplexed options:
https://learn.adafruit.com/i31fl3731-16 ... led-driver

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Re: Are these two 8x16 LED Matrix backpacks functionally ide

by BlinkyKB on Tue Nov 19, 2019 2:45 pm

adafruit_support_carter wrote:As another option, there's a double backpack version for the 1.2" LED matrices. Various colors, square or round pixels, see here:
https://www.adafruit.com/category/326

You can control brightness globally, but not per pixel.

If you want individual pixel brightness control, consider the charlieplexed options:
https://learn.adafruit.com/i31fl3731-16 ... led-driver


Great! Thanks for the tips. That driver you linked looks perfect for my needs.

BlinkyKB
 
Posts: 6
Joined: Wed Nov 06, 2019 4:51 am

Please be positive and constructive with your questions and comments.