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ESP32 Spa Controller Touchscreen wireless remote (ESP32)

This component is intended for a touchscreen ESP32 dev kit. It communicates with the controller via ESP-NOW protocol without using WiFi or any configuration (auto-discovery). The UI is dynamically constructed from data sent from the controller.

Hardware

Default configuration is set up for a Sunton ESP32-4827S043-R This is a 488x272 resistive touchscreen.
It's not a great module but it's cheap and works. Touchscreen calibration is wonky. To configure for different hardware, edit gfx.h and touch.h display-casing.png display-on.png

Software

Libraries Required

These can be installed using Arduino IDE.

  • LVGL (tested with version 8.3). See setup steps below.
  • Arduino_GFX_Library
  • XPT2046_Touchscreen (or your touchscreen's driver)

LVGL Setup

LVGL needs to be configured at the system level as follows

Note you should repeat this step every time you upgrade lvgl, as the defaults vary between versions.

  1. Copy ~/Arduino/libraries/lvgl/lv_conf_template.h to ~/Arduino/libraries/lv_conf.h (not a typo, copied to libraries dir)
  2. Edit as follows:
  3. Change "if 0" at the top to "if 1"
  4. You may need to experiment with LV_MEM_CUSTOM. The following settings work for LV_MEM_CUSTOM 0 if you need it. 
    #define LV_MEM_SIZE (96U * 1024U)
#define LV_MEM_POOL_INCLUDE <esp32-hal-psram.h>
#define LV_MEM_POOL_ALLOC ps_malloc
  5. Turn these on: 
    #define LV_TICK_CUSTOM 1   (no idea why)
#define LV_COLOR_16_SWAP 1 (possibly only useful for Squareline)
#define LV_SPRINTF_USE_FLOAT 1  (for temperature display)
#define LV_FONT_MONTSERRAT_20 1 (for larger fonts)
#define LV_FONT_MONTSERRAT_40 1 (even larger fonts)

Building

Makefile is provided for building on *nix systems using command-line tools (eg arduino-cli). See overridable defaults at the top of the Makefile.

Typical usage (once tooling is set up) is:

# compile, upload, then start serial monitor
make upload monitor
make upload monitor PORT=/dev/ttyUSB3 # change port.

If building on windows, review Makefiles and perform steps manually.