This code is derived from the SimpleWatch example of Xinyuan LilyGO TTGO_TWatch GitHub https://github.com/Xinyuan-LilyGO/TTGO_TWatch_Library
- light sleep in low power improving power consumption
- backlight slider
- black background generated with (https://lvgl.io/tools/imageconverter) true color
Smartwatch used is the T-Watch 2020v1 powered by esp32 SoC, available at following link: LILYGO® TTGO T-Watch-2020 ESP32 Main Chip 1.54 Inch Touch Display Programmable Wearable Environmental Interaction Module Board from Electronic Components & Supplies on banggood.com https://banggood.app.link/cvdGdb5937