No support for 3inch EPD (Waveshare)?

Other Hardware Displays
1

Hello,
I purchased a 3inch e-Paper Module (G) from Waveshare , which I want to use with an Arduino Nano board .
The exemplary code provided by the corresponding wiki for this module was easy to set up and proving that the display was operating.

As I will use this display to show text/numbers I am not satisfied by showing pictures.

So, I was looking into the most promising GxEPD2 repo by ZinggJM and checked and tried out the minimal example.
Unfortunately, my display was not among those supported ones. Now I end up with the question if this can be done? Or is already work in progress?

I am not skillful or experienced enough to achieve such a thing (yet).

PS. I posted the same question at arduino.stackexchange.com.

@ZinggJM I am happy to sent such a display over, as you suggested on GitHub.

Thank you.

2

@nick0023, hi, welcome to the forum!

I intend to take a look at new e-paper displays from Good Display. Last time I checked some 4-color displays were announced, but not ready for order.
Some may be the same panels as used by Waveshare. I might ask Waveshare for free samples.

But I enjoy to get displays offered by users; its an additional reward than just to see my library used.

Please confirm your offer to send this display, in a personal message, then I will answer with my address. Thank you.

Jean-Marc

3

Thank you Jean-Marc!
Confirmed, the offer strands (as I can't use them in the intended way).
How do I sent private a private message?

4

I just sent a message to you.

I thought there is a letter symbol somewhere, but I had to click on your name to see your summary.
There I found the message button.

5

Interim report: I got this display working with GxEPD2. But there are still open questions.

As I also ordered a 2.9" 4-color e-paper display from Good Display - it is on the way - I prefer to check with and add support to this also, before I create a new release.

If anyone is waiting for support for the Waveshare 3" 4-color display with GxEPD2, please let me know. Then I would add it to the GitHub repo before preparing the next release.
-jz-

6

Good evening JZ,

Thank you for the update! And good to know that you managed to get it working with the GxEPD2!

Best!
n.

7

Good evening JZ and Merry Christmas belatedly.
Finally, I found some time to come back to this project and wanted to start with the new version of your GxEPD2 and my 3" display. My intention was to get a minimal working example up and running, but, this seems a bit more complex as I do not have any experiences with EPDs.

I went through the .h-files to find and uncommented all lines regarding my display without any success.
I then choose the alternative and copied the constructor manually to have a better overview on the necessities for the display. Still, ''display'' was not declared.

Maybe you can push me towards a good intro to all this?

Best!
n.

8

Hi @nick0023,

I suggest you start with GxEPD2_Example and configure GxEPD2_display_selection_new_style.h.

First you select the display class for your 4-color display, by commenting out line 19 and uncommenting line 21:

// select the display class (only one), matching the kind of display panel
//#define GxEPD2_DISPLAY_CLASS GxEPD2_BW
//#define GxEPD2_DISPLAY_CLASS GxEPD2_3C
#define GxEPD2_DISPLAY_CLASS GxEPD2_4C
//#define GxEPD2_DISPLAY_CLASS GxEPD2_7C

Then you select the driver class for your display by uncommenting line 93:

#define GxEPD2_DRIVER_CLASS GxEPD2_300c     // Waveshare 3.00" 4-color

If you don't use the default (suggested) wiring as in GxEPD2_wiring_examples.h, then you need to adapt the constructor parameters in the conditional compile section for your processor.

For this kind of questions, I usually ask for processor used, board selected to compile for, and wiring used, pin-to-pin.

Then I could tell which line you alternately could uncomment in GxEPD2_display_selection.h.

Happy New Year
-jz-

9

Hi JZ,
Thank you so much, this did the trick (i indeed forgot to select the driver class in line 93)!!

Happy New Year to you too!
Best,
n.

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