Add 72x40 display by andbad · Pull Request #5546 · letscontrolit/ESPEasy

andbad · 2026-05-12T13:56:08Z

I added the 72x40 display for ESP32-C3 dev board like this:
https://emalliab.wordpress.com/2025/02/12/esp32-c3-0-42-oled/

Add 72x40 display

TD-er · 2026-05-12T18:36:03Z

I assume you did test it yourself on your board after these last changes?

tonhuisman · 2026-05-12T19:47:17Z

+    F("64x48"),
+    F("72x40") };
  FormSelectorOptions selector(NR_ELEMENTS(options3), options3, values);


Because of the way this is constructed, this will crash when configuring the display configuration in P023, as that plugin won't provide the 4th option value.
I think the number of items to display in the selector will have to be added as a new argument to the function, can default to 3, for 'other plugins using this function', and from P036 a value of 4 should be provided (or the length of the values array, like NR_ELEMENTS(optionValues)).

Alternatively, you can change the signature for the function, having const int values[] (also in the .h file), and take the NR_ELEMENTS(values) instead of NR_ELEMENTS(options3), that would be an easier change 😉

I finally took some time to try this on actual hardware, and the above suggestion (of course) won't work as C/C++ doesn't allow for a dynamic array as a method argument 🫣 so I introduced an extra argument for the size of the selector-array, that defaults to 3.

Then it does work as intended, without breaking P023, that uses the same size selector function.

Here's the diff for the changes that I made. You can place the attached file in the base directory of your repo, and from the VSCode terminal use this command:

git apply PR5546-OLedFormSizes.txt

PR5546-OLedFormSizes.txt
(Github doesn't allow a .diff file, but the content is in the default git diff format)

Thank you.
Unfortunately, my environment no longer allows me to properly compile firmware for my hardware (even in the main branch) after I updated to the latest version. This appears to be due to compatibility issues with the ExpressIf platform. I've wasted some time and tokens trying to resolve the issue, but I'm still only halfway there.
But I digress.

Anyway, I applied your changes.
I hope all is well.

By(t)e

NB: The 00.138 : (256100) Error | FS : Error while reading/writing devsecurity.dat in 2138 in your log is because the devsecurity.dat file doesn't exist yet on your unit, I also don't have it on my test-unit, and see the same message. This is not causing any issues.

I installed previous version of ESPEasy. Anyway, if I install stable version with web-flasher, it works. I can connect to default AP and flash you .bin file. The upgrade completed successfully, but in the serial log i find the same error.

I erased all flash in ESPConnect tool (thank you, I didn't know that), then I flashed factory.bin file. No lucky.

Well, it is possible that it's hardware-related.
Do you have another board, preferably from a different manufacturer, or with a different ESP32 chip, to test this build on? I can create that build for you, of course.

NB: The board I've used for testing is this one: https://aliexpress.com/item/1005010315154730.html

NB2: Have you also tried using the latest beta build (without support for this display, of course)?
Available from https://TD-er.nl/ESPEasy/latest/

I have two boards, both like the one you have. One looks identical, the other has some SMD components (I'm not sure if they're resistors or something) arranged slightly differently.

I tried installing the beta Display-A version on both.
Neither works.

[11:03:58] INIT : Booting version: ESP_Easy_mega_20260520_display_A_ESP32c3_4M316k, (GitHub Actions) HEAD_4978f02 (ESP32 SDK 5.5.4.260518) [11:03:58] 00.061 : (258864) Info | INIT : Free RAM:258940 [11:03:58] 00.063 : (258780) Info | INIT : Manual Reboot #13 - Restart Reason: CPU0: usb uart reset digital core [11:03:58] 00.073 : > [11:03:58] Build changed! [11:03:58] 00.129 : (256424) Info | ESPEasy console using ESPEasySerial [11:03:58] 00.151 : (256404) Info | ESPEasy console fallback enabled [11:03:58] 00.154 : (256236) Error | FS : Error while reading/writing security.dat in 2138 [11:03:58] 00.156 : (255960) Error | FS : Error while reading/writing security.dat in 2138 [11:03:58] 00.159 : (255932) Error | FS : Error while reading/writing devsecurity.dat in 2138 [11:03:58] 00.161 : (256088) Info | INIT : Check for Priority tasks [11:03:59] 00.162 : (256088) Info | INIT : SPI not enabled [11:03:59] 00.164 : > [11:03:59] PID:0 [11:04:00] 00.164 : > Version:0 [11:04:00] 00.164 : > INIT : Incorrect PID or version! [11:04:00] 01.165 : > RESET: Resetting factory defaults... using default settings [11:04:00] 02.166 : > RESET: Warm boot, reset count: 3 [11:04:00] 02.167 : > RESET: Too many resets, protecting your flash memory (powercycle to solve this) [11:04:00] 02.178 : (255896) Info | ESPEasy console using ESPEasySerial [11:04:00] 02.200 : (255896) Info | ESPEasy console fallback enabled [11:04:00] 02.213 : (255896) Info | ESPEasy console using ESPEasySerial [11:04:00] 02.235 : (255896) Info | ESPEasy console fallback enabled [11:04:01] 03.202 : (255512) Info | WiFi : Set state from: Disabled to: STA_Scanning timeout: 10000 [11:04:01] 03.304 : (255596) Info | WiFi: Disconnected. Connected for: 00.000 sec [11:04:01] 03.303 : (255596) Info | WIFI : Set WiFi to STA [11:04:01] 03.312 : (216100) Info | WIFI_READY [11:04:03] 03.569 : (213216) Info | WD : Uptime 0 FreeMem 213336 [11:04:03] 05.152 : (211348) Info | SCAN_DONE [11:04:03] 05.165 : (211952) Info | WiFi : Set state from: STA_Scanning to: AP_Fallback timeout: 60000 [11:04:03] 05.180 : (208372) Info | WIFI : AP Mode enabled. SSID: ESPEasy- IP: 0.0.0.0 ch: 1dhcps_start(): could not obtain pcb [11:04:03] 05.182 : (208000) Error | WIFI : Failed to enable AP Captive Portal [11:04:03] 05.184 : (203300) Info | AP: Disconnected. Connected for: 00.000 sec [11:04:03] 05.190 : (197496) Info | Webserver: start

tonhuisman · 2026-05-23T11:36:50Z

There are 2 tasks left to complete this PR:

Add your name and a summary of the change to the Changelog in _P036_FrameOLED.ino (use the same style already used, please, newest change on top)
Update the docs (a screenshot of Display Size, stored as P036_DisplaySizeOptions.png (case-sensitive filename!), width in pixels: 650, height: as high as needed, with a few pixels margin above and below, the rounded corners are applied by the RTD theme), (current page)

andbad added 5 commits May 12, 2026 15:42

Update _P036_FrameOLED.ino

032c480

Add 72x40 display

Add new display configuration for 72x40 resolution

c3c99dd

Add case for pix72x40 resolution handling

8bb8ce0

Update p036_resolution enum values

6ca21c8

Add new display option '72x40' to OLed_helper

dcc1e79

TD-er reviewed May 12, 2026

View reviewed changes

Comment thread src/src/PluginStructs/P036_data_struct.h

Fix enum values for p036_resolution

f7e285b

andbad closed this May 12, 2026

andbad reopened this May 12, 2026

TD-er reviewed May 12, 2026

View reviewed changes

Comment thread src/src/PluginStructs/P036_data_struct.cpp Outdated

andbad added 4 commits May 12, 2026 18:43

Reorder resolution options in OLED frame

64de797

Fix formatting of optionValues array in FrameOLED

c40cdc8

Reorder display size options in OLed_helper.cpp

30c1118

Remove and re-add 72x40 resolution configuration

c77e1f7

tonhuisman reviewed May 12, 2026

View reviewed changes

andbad added 4 commits May 13, 2026 13:27

Merge branch 'letscontrolit:mega' into andbad-72x40

48641c7

Update OLedFormSizes call to include element count

3aebc9c

Update OLedFormSizes to use optionsSize parameter

a8c6635

Add default parameters to OLedFormSizes function

b7f74fa

tonhuisman reviewed May 22, 2026

View reviewed changes

Comment thread src/src/Helpers/OLed_helper.cpp Outdated

Refactor FormSelectorOptions initialization

4d6d2c1

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