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ItsyBitsy 32u4 with 1.3" TFT
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ItsyBitsy 32u4 with 1.3" TFT

by Jalle on Thu Mar 18, 2021 12:08 pm

Hello.
I am working on a small project and wonder if the ItsyBitsy 32u4 5V (3677) will work with the 1,3" TFT (4313).
What I want to achieve is a simple animation (or rather slide-show) with 3 images that is stored on the TFT's SD card.
Regards
Jalle

Jalle
 
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Re: ItsyBitsy 32u4 with 1.3" TFT

by blnkjns on Fri Mar 19, 2021 3:41 pm

Remember the 32u4 is not having much memory (2.5 kB) to deal with the 240x240 pixels, as ideally you would want 240x240x2=115kB of RAM for the displaybuffer.
In theory you could pull data from the SD directly to the display, but then you would need like a BMP sequence with uncompressed bitmaps that can be put through without modification, or only some minimal bit-reduction (24 bit to 16 bit). You can't use the GFX library bitmap routines, just try to write single pixels from a data stream of your SD card.

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Re: ItsyBitsy 32u4 with 1.3" TFT

by Jalle on Sat Mar 20, 2021 5:20 am

Thank you for your reply.
Any suggestions for something that would work with the TFT?
For example the Metro Mini 328?
I have got my project working on an Arduino UNO, but I would like to scale down the physical size.
Thanks
//Jalle

Jalle
 
Posts: 5
Joined: Thu Mar 18, 2021 11:37 am

Re: ItsyBitsy 32u4 with 1.3" TFT

by blnkjns on Sat Mar 20, 2021 8:02 am

A board with enough RAM, Itsy Bitsy M0/M4?
It will also remove the 3,3V->5V barier.

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Re: ItsyBitsy 32u4 with 1.3" TFT

by Jalle on Sat Mar 20, 2021 8:24 am

Thank you!
I will give M0 a try.
//Jalle

Jalle
 
Posts: 5
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Re: ItsyBitsy 32u4 with 1.3" TFT

by blnkjns on Sat Mar 20, 2021 8:43 am

If you did not order yet, I would advice to consider the M4, as that one can fit a screenbuffer. The M0 does have onboard flash, and it will probably allow pass-through, but you have to be more careful with the code.

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Re: ItsyBitsy 32u4 with 1.3" TFT

by Jalle on Sat Mar 20, 2021 8:48 am

Oh, ok, thanks.
So M4 it is.
//Jalle

Jalle
 
Posts: 5
Joined: Thu Mar 18, 2021 11:37 am

Re: ItsyBitsy 32u4 with 1.3" TFT

by blnkjns on Sat Mar 20, 2021 8:56 am

Good choice. It is my favourite tiny board. So powerful and well designed. Hope it will help you make it work.

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Re: ItsyBitsy 32u4 with 1.3" TFT

by Jalle on Sat Mar 20, 2021 9:01 am

Thank you.
I feel confident.
//Jalle

Jalle
 
Posts: 5
Joined: Thu Mar 18, 2021 11:37 am

Please be positive and constructive with your questions and comments.