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Arduino drawing vector code4/10/2023 ![]() ![]() But over SPI, reading is just as expensive as writing. If I understand correctly, ’s storing some extra info in the unused bits of the pixels of the ILI9341 frame buffer, and has to read them back to determine which pixels need to be updated. I’ve done a good bit of coding for the ILI9341, and I’m quite impressed by this demo! A person more knowledgeable than me suggested there seem to be multiple manufacturers of the chip, including some unlicensed clones, which may account for the different real-world performance. Though I’ve been able to drive one up to 40Mhz, others didn’t have similar success. According to the datasheet, it only supports up to 10Mhz or so. In addition to CPU and RAM limitations, the ILI9341 is usually connected via SPI, which is often the biggest bottleneck. It’s not a video game yet, but thinks he can port the classic game Spectre to this platform and have it run at a decent frame rate.Ī little additional context missing from the summary. In a demo application, ’s LCD and Arduino can display the Stanford bunny, a low-poly 3D face, and geometric object. To fix this, ’s library renders objects from front to back – if the pixel doesn’t change, it doesn’t need to be rendered. Rendering in 3D presents its own problems, with convex surfaces that can overlap themselves. ![]() To solve this problem, built his render library to only render pixels that are different from the previous frame. There isn’t enough memory to render off-screen, either. With 16-bit color and a resolution of 320×240 pixels, there simply isn’t enough memory or the processing power on an ATMega microcontroller to render anything in the time it takes to display a single frame. Both of these drivers have noticeable flicker when the animation updates, caused by the delay between erasing a previous frame and when a new frame is drawn. The display in question uses the ILI9341 LCD driver, found in the Adafruit library, and an optimized 3D graphics driver. It is possible to display 3D vector graphics, with an updated graphics library wrote. This is an impossible task with an ATMega microcontroller – the Arduino does not have the RAM or the processing power to play full-screen animations. picked up a few of these displays in the hope of putting a few animated. That is useful for visualizing electrical signals for analysis, but it also means that controlling the position of the electron beam is as simple as adjusting the voltage of the oscilloscope’s input signals.There are cheap LCDs available from China, and when plugged into an Arduino, these displays serve as useful interfaces or even shinier baubles for your latest project. One signal pushes the beam up and down in the Y axis, while the second signal pushes the beam left and right in the X axis. But instead of sweeping the electron beam to scan line by line, they direct the beam according to the voltage of the input signals. Trevor combined these two ideas and made a video explaining how you can create vector video art with an Arduino, a handful of resistors, and an oscilloscope.Ī conventional analog oscilloscope contains a CRT just like an old tube TV. But it is also possible to create vector images by directing the electron beam along paths instead of scanning, which you might notice is what an oscilloscope does. Those work by directing an electron beam very quickly along row after row while pulsing power to create raster images. Unless you’re very young, then you probably remember watching a CRT (cathode-ray tube) television. ![]()
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