Blank Waveshare Screen using GxEPD2_Example.ino [Resolved]

Other Hardware Displays
1

Hi,

A Waveshare e-paper B&W 5.79inch connected to a Nano 33 IoT appears to be running setup() but with timeout issues based on the Serial Monitor output. The e-paper display shows no sign of life. Any recommendation on how to proceed debugging?

I'm using the GxEPD2 library ver 1.6.1 and a provided example GxEPD2_Example.ino. Arduino IDE ver 2.3.4.

Here's a snippet of the the start of the Serial Monitor output:

Entered setup()
pages = 2 page height = 151
Busy Timeout!
_Update_Full : 10000680
Busy Timeout!
_Update_Full : 10000781
Busy Timeout!
_Update_Part : 10000884
Busy Timeout!
_Update_Part : 10000939
Busy Timeout!
...

2 pages looks correct, but not sure that 151 for height is correct. Display is supposedly 792x272 pixels. I added 'Entered setup()'.

Nano compile stats:

Sketch uses 85660 bytes (32%) of program storage space. Maximum is 262144 bytes.
Global variables use 19288 bytes (58%) of dynamic memory, leaving 13480 bytes for local variables. Maximum is 32768 bytes.

In GxEPD2_display_selection_new_style.h, here's the 5.79in related classes uncommented:

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

and

#define GxEPD2_DRIVER_CLASS GxEPD2_579_GDEY0579T93 // GDEY0579T93 792x272, SSD1683 (FPC-E004 22.04.13)

Here is the display <> Nano mapping: (triple-checked)
VCC (red) <> +3V3
GND (blk) <> GND (next to D2)
DIN (blu) <> D11
CLK (ye) <> D13
CS (or) <> D10
DC (grn) <> D8
RST (wh) <> D9
BUSY (purple) <> D7
PWR (brn) <> +3V3

On the back of the display board there is a jumper soldered to the 0 side which looks to indicated 4-wire SPI.

IMG_4051
IMG_40511920×2560 477 KB

IMG_4052
IMG_40521920×2560 352 KB

2

Your post is a mess between GxEPD and GxEPD2. Fix it!

Check continuity of your wiring.
DuPont connections may be bad, the white connector may not be pushed in firmly, or your soldering may be questionable. Post a picture, for experts to comment on.

3

Thanks. My bad on the GxEPD/GxEPD2 confusion. GxEPD2 library is being used. Added a couple pics.

4

Re connections - continuity checks out from breadboard to display cable PCB solder pads.

5

This line only defines that the display is Black & White.

You must find an entry that matches your pixels and the driver being used. It may be on one of the other display selection files.

6

Thanks @JohnRob - I picked the driver class below. Is there an additional one to look for?

#define GxEPD2_DRIVER_CLASS GxEPD2_579_GDEY0579T93 // GDEY0579T93 792x272, SSD1683 (FPC-E004 22.04.13)
7

I've not used any Waveshire displays, all mine are Good Display. However I know your choice must target the same driver IC as your display.
For instance, the one you picked uses a SSD1683 driver IC. Is this the IC your display uses?

8

Display is no longer blank. Had ordered B&W, but was shipped a 4-color e-paper display. Have changed class definitions accordingly.

9

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