ESP32 NodeMCU with ILI9341 SPI

[sl4m01]

Dear all,
Is it possible to use the following combination for OpenHASP:

• ESP32 NodeMCU Module WLAN WiFi Dev Kit C Development Board with CP2102 (SoC ESP32-WROOM 32)
• 2 4" ILI9341 SPI touch display

Is it possible to use a pre compiled file (for example Wemos D1 mini ESP32)?

Or do I need to compile it by myself? If yes can someone give me a hint which file I do have to adapt?

Thank you :)

[fvanroie]

Sure! The d1-mini-esp32_ili9341_full_4MB_v0.6.1.bin binary should work on any ESP32-WROOM (or even ESP32-WROVER if gpio 16 and 17 are unused). The d1-mini-esp32 is just our ESP32 of choice and it is also compatible with other development boards, like the ESP32 NodeMCU.

The pins used in d1-mini-esp32_ili9341_full_4MB_v0.6.1.bin are choosen based on the d1 mini ESP32 with Lolin 2.4" TFT shield, but you can essentially use any ILI9341 or ESP32 hardware instead. The pinout for that binary to connect the ESP32 to your screen is described here: https://haswitchplate.github.io/openHASP-docs/0.6.1/displays/MSPxxxx/#pin-configuration

So you don't need to compile the firmware yourself if you use that pinout. The difference in binaries vary from device-to-device if they need other drivers, specific pins or hardware/software configurations.

In your case, just connect the jumper wires according to the documentation and use d1-mini-esp32_ili9341_full_4MB_v0.6.1.bin.

Tip: Leave TFT_MISO unconnected if you only get a white screen on an MSP display, that pin it's not used in openHASP.

[sl4m01]

Hello fvanroie,

thank you for your answer!
I checked my wiring and unfortunately i do have a slightly different wiring than described in the manual.
However, its also working using the TFT_eSPI library.

The following connections are different:
TFT / my wiring / OpenHASP manual
cs / g15 / g26
reset / g4 / g15
dc / g2 / g5
led / g16 / g21
t_cs / g21 / g17

Due to the fact that its already soldered and put in a 3D printed case I dont want to completely re-do it.

I tried to do my own compilation online with Gitpod.
However, i dont understand how to change the configured wiring (if even possible).

In the platformio_override-template.ini i found the following code:

debug_tool = esp-prog
debug_init_break = tbreak setup
build_flags =
${env.build_flags}
${esp32.build_flags}
;region -- TFT_eSPI build options -----------------------------------
${lcd.lolin24}
${esp32.vspi} ; Use VSPI hardware SPI bus
-D TFT_DC=5
-D TFT_CS=26
-D TFT_RST=-1 ; RST
-D TFT_BCKL=22 ; None, configurable via web UI (e.g. 21)
-D TOUCH_CS=17 ; (can also be 22 or 16)
; -- Options ----------------------------------------
-D HASP_USE_TELN

However, it seems to be for a different hardware setup (lcd.lolin24 and esp32.vspi).

Can you maybe give me a hint if its possible and where to adapt it?

EDIT:
I managed to get it done.
I opened the platformio_overwrite.ini and activated "d1-mini-esp32_ili9341".
Then i adapted the user_setups/esp32/d1-mini-esp32_ili9341.ini in the following way:

;region -- TFT_eSPI build options ------------------------
${lcd.lolin24}
${esp32.vspi} ; Use VSPI hardware SPI bus
-D TFT_DC=2 ; 5
-D TFT_CS=15
-D TFT_RST=4 ; RST
-D TFT_BCKL=16 ; None, configurable via web UI (e.g. 21)
-D TOUCH_CS=21 ; (can also be 22 or 16)

Compiled and flashed it via Tasmota PyFlasher and its working :)

[fvanroie]

Good to hear you figured it out! There are actually several ways to do this, but adapting an existing config is certainly the easiest route.