Hosyond 3.5 inch 320x480 IPS Capacitive Touch Screen LCD Module SPI Serial ST7796U Driver for Arduino R3/Mega2560

Using this on a teensy 4.1. Had a few problems at first: ST7796 driver didn't work, so used Arduino_ILI9341 - works fine! Runs up to 110mhz spi on my teensy with good clean soldering and short cables. FT6336U didn't work at first - bad driver code from github (aselectroworks/Arduino-FT6336U - don't use this doesn't work - has a 10ms delay in the readbyte code e.t.c. lol), so cobbled together my own from github "strange-v/FT6X36" driver. Had trouble with that as well - had to delay 300ms on power up before using the FT - else it would't init at all. Also had problems with the FT cutting out while SPI display was updating - All these problems were caused because my CPT reset pin wasn't being used - did not connect it and so it was floating and SPI triggered it - just tie it to VCC if not using it. You can also tie the LCD reset to GND and CS to VCC with a 4.7k resistor if your only using 1 display. Now everything is working great - it's a great display with a nice slick and easy CPT touch interface! With LVGL I get 30fps no problem without using the fast t4 code library.

This is a very nice display. It is bright and crisp. Colors look really good. When it arrived I was pleasantly surprised to find that it already had the header soldered on! It worked right out of the box. I used an ESP32 MCU to drive the display. I used the Adafruit_GFX and Adafruit_ILI9341 libraries in the Arduino IDE and they worked perfectly. The only issue I had was, as a couple other reviews have mentioned, the colors were inverted. However this was easily remedied using the tft.invertDisplay(true) command that is found in the Adafruit_ILI9341 library. I tested it with several different programs. One simply displayed a full screen photo-realistic image, one was an ioT project that pulled weather data from online and displayed it on the TFT, one was another ioT project that read the time from a time server and displayed it as an analog clock. The last one was a test of the touch screen. It uses an FT6336 chip to drive the touch screen and I2C for the touch screen communication. I used a library I found called FT6336U to interface with the touch screen. The library expects the display to be in portrait mode ( 240 W X 320 H). I use mine in landscape mode (320 W and 240 H) so I had to do a few code tweaks to get it to work in landscape mode. Once they were done the touch screen functioned perfectly. It was accurate and responsive. I really like this display and would recommend it to anyone who needs a cool display to go along with their projects.

Unfortunately, the SD slot is instable and causing issue on this product. The screen is great though.

Functions on a part time basis. The LCD display and touch sense work occasionally. Not many drivers available for the FT6336U sensing chip. Frequently receive I2C errors and device freezes. Not recommended. Returning.

Good display and Hosyond provides reasonable online documentation. Only problem I had was using the SD card. The interface is shared and while there is a separate chip select, it becomes very unresponsive while using the screen/touchpad.