https://blog.jmaker.com.tw/chinese_oled/?fbclid=IwAR3CYmxCjnFQv-r39lW0DeOcvexsgp2eld2lrE5k4Lp8nySX9Ypyg_cbgAE

U8g2 Github
https://github.com/olikraus/u8g2

U8g2 fonts

https://github.com/olikraus/u8g2/blob/master/doc/u8g2fntlistall.pdf

U8g2 reference

https://github.com/olikraus/u8g2/wiki/u8g2reference

ESP-NOW：竟然還有如此好用的無線通訊方式 | ESP32學習之旅-Arduino版_鐵熊 – MdEditor (gushiciku.cn)

https://www.bilibili.com/read/cv14663437
https://www.youtube.com/watch?v=QcwwVi3FDPQ

https://www.hackster.io/usini/display-images-on-a-st7789-screen-fbb0d7

https://blog.darkthread.net/blog/u8g2-cht-font-tool/
https://blog.csdn.net/menghuanbeike/article/details/75666266

https://github.com/yoprogramo/ESP_QRcode

https://github.com/ricmoo/QRCode