Review on 🌟 Enhance Your Arduino Experience with ELEGOO UNO R3 2.8 Inches TFT Touch Screen: SD Card Socket Included! by Ben Balas

Display and touch screen work fine on Mega2560. FYI I also tried an older version of duemilenove but it didn't work properly, the text and graphics demos were garbled - maybe it's a sync or pin mapping issue. Since it's not advertised for this board, it's not a big deal, but it's worth mentioning if anyone is thinking of buying it for that purpose. The demos and information provided are surprisingly good compared to most hobbyist equipment. They're using adafruit's work, although they don't know if it's a direct copy. The quality is ok, especially for this price. Two things I noticed: flickering when refreshing the display, it could be a problem with the power supply decoupling, or maybe the controller chip can't display when writing to VRAM. Second, images look blurry when viewed straight on, images look better at a slight angle. Performance isn't great, for example you can see the screen rubbing, but I haven't looked closely to see if that could be optimized, for example the demos might not be using the full power of the controller. The other big issue is that the shield doesn't use the ICSP connector for SPI (required to access the SD card) and relies on digital pins 10-13. Unfortunately on the Mega this is regular I/O with SPI on 5x pins (or ICSP). The SD card demos confirm this, but don't offer a workaround. Luckily, Adafruit does this with their S/W SPI library (looking for SD card on each pin), although it's obviously much slower than H/W SPI. Some shields use the ICSP header for more compatibility, so I don't know why they left it out here. Overall, I'd recommend a basic device UI, but look elsewhere if you need a high-speed SD card interface.