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Hardware What I’m Up To

New life for an old Raspberry Pi with a 3.5″ touchscreen

Since getting my Raspberry Pi 4 as part of the cybersecurity course I took last summer, I haven’t done any work with my older Raspberry Pi 3, which is still a decent computer, especially considering its size and price.

That all changed when I finally unboxed my Kuman 3.5″ LCD display, (a steal at $20) which my in-laws gave to me for Christmas (they went through my Amazon wishlist for gift ideas). They had no idea what it was, but figured I’d like it, which I do!

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With a 3.5″ diagonal and 480 by 320 resolution, this screen isn’t meant for reading web pages or PDFs or writing code, documents, or spreadsheets. It’s meant to be a display for an IoT project that doesn’t need to display a lot of information, such as a weather app, smart thermostat, or even low-res videogames.

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The screen’s not just an output device, but an input device as well, since it’s touch-sensitive. Once you’ve installed the driver, the Pi treats the screen as if it were another mouse, treating taps as mouse clicks, and the location of your tap as mouse coordinates.

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The screen plugs directly into the Pi’s GPIO (General Purpose Input/Output), a 40-pin connector located along the top edge of the board, which it uses for power. It’s also what physically holds the screen to the Raspberry Pi.

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The video signal is fed to the screen through a U-shaped HDMI connector that connects the Raspberry Pi’s HDMI port to the screen’s HDMI port.

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I’ll post the results of my noodling with this new Raspberry Pi/screen combo here on Global Nerdy. It should be interesting!

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