Noam Zeise discusses using a small 2 inch display as a monitor for a Raspberry Pi, where it can display tty terminals and X desktops and applications as if it was a normal screen connected over HDMI.
My overall goal is to have a sort of handheld “console” that I can connect a keyboard to and use as a normal computer. I have a 2 inch 240×320 ips tft display sold by adafruit, driven by an ST7789 controller by Sitronix.
For a computer, I’m using a Raspberry Pi Zero 2 W. It costs around £15. This has the same processor as the Pi 3, but only 500mb of ram. The software/setup should work with any Pi.
See the video below and more in the post here. The source code is here.
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