TTGO T-Display ESP32 with 240x135 TFT via SPI with TFT_eSPI

This usermod enables use of the TTGO 240x135 T-Display ESP32 module for controlling WLED and showing the following information:

• Current SSID
• IP address, if obtained
  • If connected to a network, current brightness percentage is shown
  • In AP mode, AP, IP and password are shown
• Current effect
• Current palette
• Estimated current in mA (NOTE: for this to be a reasonable value, the correct LED type must be specified in the LED Prefs section)

Button pin is mapped to the onboard button adjacent to the reset button of the TTGO T-Display board.

I have designed a 3D printed case around this board and an "ElectroCookie" project board, a level shifter, a buck regulator, and a DC power jack. I use 12V WS2815 LED strips for my projects, and power them with 12V power supplies. The regulator supplies 5V for the ESP module and the level shifter. If there is any interest in this case which elevates the board and display on custom extended standoffs to place the screen at the top of the enclosure (with accessible buttons), let me know, and I will post the STL files. It is a bit tricky to get the height correct, so I also designed a one-time use 3D printed solder fixture to set the board in the right location and at the correct height for the housing. (It is one-time use because it has to be cut off after soldering to be able to remove it). I didn't think the effort to make it in multiple pieces was worthwhile.

Based on a rework of the ssd1306_i2c_oled_u8g2 usermod from the WLED repo.

Hardware

Github reference for TTGO-Tdisplay

• TTGO T-Display

Requirements

Functionality checked with:

• TTGO T-Display
• PlatformIO
• Group of 4 individual Neopixels from Adafruit and several full strings of 12v WS2815 LEDs.
• The hardware design shown above should be limited to shorter strings. For larger strings, I use a different setup with a dedicated 12v power supply and power them directly from said supply (in addition to dropping the 12v to 5v with a buck regulator for the ESP module and level shifter).

Setup Needed:

• As with all usermods, copy the usermod.cpp file from the TTGO-T-Display usermod folder to the wled00 folder (replacing the default usermod.cpp file).

Platformio Requirements

Platformio.ini changes

Under the root folder of the project, in the platformio.ini file, uncomment the TFT_eSPI line within the [common] section, under lib_deps:

# platformio.ini
...
[common]
...
lib_deps =
    ...
  #For use of the TTGO T-Display ESP32 Module with integrated TFT display uncomment the following line  
    #TFT_eSPI
...

In the platformio.ini file, you must change the environment setup to build for just the esp32dev platform as follows:

Comment out the line described below:

# Release binaries
; default_envs = nodemcuv2, esp8266_2m, esp01_1m_full, esp32dev, esp32_eth, esp32s2_saola, esp32c3

and uncomment the following line in the 'Single binaries' section:

default_envs = esp32dev

Save the platformio.ini file. Once saved, the required library files should be automatically downloaded for modifications in a later step.

Platformio_overrides.ini (added)

Copy the platformio_overrides.ini file which is contained in the usermods/TTGO-T-Display/ folder into the root of your project folder. This file contains an override that remaps the button pin of WLED to use the on-board button to the right of the USB-C connector (when viewed with the port oriented downward - see hardware photo).

TFT_eSPI Library Adjustments (board selection)

You need to modify a file in the TFT_eSPI library to select the correct board. If you followed the directions to modify and save the platformio.ini file above, the User_Setup_Select.h file can be found in the /.pio/libdeps/esp32dev/TFT_eSPI_ID1559 folder.

Modify the User_Setup_Select.h file as follows:

• Comment out the following line (which is the 'default' setup file):

//#include <User_Setup.h>           // Default setup is root library folder

• Uncomment the following line (which points to the setup file for the TTGO T-Display):

#include <User_Setups/Setup25_TTGO_T_Display.h>    // Setup file for ESP32 and TTGO T-Display ST7789V SPI bus TFT

Build the file. If you see a failure like this:

xtensa-esp32-elf-g++: error: wled00\wled00.ino.cpp: No such file or directory
xtensa-esp32-elf-g++: fatal error: no input files

try building again. Sometimes this happens on the first build attempt and subsequent attempts build correctly.

Arduino IDE

• UNTESTED