SPI
https://github.com/adafruit/Adafruit-ST7735-Library
https://github.com/adafruit/Adafruit-GFX-Library
http://henrysbench.capnfatz.com/henrys-bench/arduino-displays/1-8tft-v1-0-st7736-arduino-tutorial-1-hello-world/
https://learn.adafruit.com/1-8-tft-display
7 €
Aliexpress