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The ILI9341 is supported in Great Cow Basic which compiles for mega328..ie uno
I want to use your method. I have uno scope running using GCBasic. https://www.youtube.com/watch?v=zTWHTgf9fw0&t=142s
RPi pwm led strobeView Instructable »
There's life in old dogs. I swapped the Win 7 hard drive on a laptop it ran slow on and fitted another drive and installed Linux Mint. It runs much faster now.