1.69' ST7789 240x280 rounded corner LCD
That screen is available for ~ 4$ on ebay It has a few oddities. First the pinout, it is not easy to find but here it is : 1 GND 2 LEDK (connect to ground) 3 LEDA (connect to VCC with a few ohms resistor, like 10 Ohms) 4 VCC 5 GND 6 GND 7 DC 8 CS 9 SCL (SPI Clock) 10 SDA (SPI Data) 11 RESET 12 GND Second, it is a bidirectional SPI, meaning only 2 pins are used: Clock and Data Data is used for both as MOSI and MISO depending on the command. On those screen, reading is seldom used, so you could just use it as MOSI. The logical screen is a plain square 240x280 box, some pixels are just not physically there.