Hosyond4.0 Inch 320x480 TN Capacitive Touch Screen LCD Display Module SPI Serial ST7796S Driver for Arduino R3/Mega2560

Arduino MEGA works with Adafruit_ST7796S_kbvTeensy 4.1 works with ILI9488_t3Touch works with FT6336U (FT6336U CPT Controller).Touch did not work with RAK14014_FT6336U as another review suggests. That library is missing the definition of reset pin. Maybe Needs to use the main board reset pin. That said, I did not spend too much time trying to debug it.I am only using the touch for pressing buttons, so I do not know how it works for gestures. For simple touches, it works way better than a resistive touch. No debouncing needed and very clean touch coordinates.It is an SPI screen, so drawing time is noticeable, but it is significantly faster for Teensy 4.x.Documentation: Good for pin and mechanical descriptions.Manufacturer libraries: don't try...

Update: Changed from 5 to 4. The first review was just on the LCD display - I had not tested the Touch. The Touch init() tries to read 3 registers - which my unit failed to do (all data return was zero). I sent several emails to customer support and never got a reply (Note: 2 days earlier I sent an email about where to acquire technical info and they replied the next day). I guess customer service is good for directing you to a web site but NOT about any technical questions.I returned the unit to Amazon and requested a replacement - which I received in 3 days. Attempted the Touch init() again - this time the device returned 2 of the 3 requested register values. With partial response, I tested Touch for actually detecting and responding with Touch coordinates - It worked as it should - So I'm keeping the display.Below is the website for any technical information on the unit - so you don't have to request it yourself. Also .. the Touch communicates over I2C - the device addresses are (8 bit address) - write 0x70 and read - 0x71. The I2C addresses published in libraries for the touch device are incorrect for this product.Web Site: http://www.lcdwiki.com/4.0inch_Capacitive_SPI_Module_ST7796Hope that helps!!First Review: ....I don't use any libraries - I write my own drivers. Several users stated that they tried the ST7796s driver associated with the display library they were using and it did not work - so they tried a different driver chip.Most all these driver chips are very close in nature - if not exactly alike. I suspect many of the libraries have not fully implemented the ST7796s yet show it in their driver selection - leading to people having issues.I used the Initialization sequence found in 'Adafruit_ST7796S_kbv.cpp'. Hardware setup for 4 wire SPI with hardware Display Reset. Display works as expected. If you are having issues - use (if you have one) a logic analyzer to capture the control signals and compare them to what is stated in the specification.For the size and capacitive touch - I think the price is very good.

The reviews that state to use the ILI9488 display library and the FT6336 touch library are correct. I happen to be using the RAK14014_FT6336U library, but there may be other variants.The display and touch screen work. However, 320x480 are a lot of pixels to draw if you don't have a processor that supports a fast SPI bus speed. I'm running a MKR1000, and it takes 2+ seconds just to set the screen to a background color.

This display is great for the price, the only issue I had was the incorrect listing. The advertised ST7796 driver isn't correct it seems. It only makes half the screen work and the other half a solid white. By specifying the ILI19488 driver you get a full panel image with no artifacts. Nice for when making devices that requires a display with touch that's not targeting a high contrast ratio. It's also recommended to run your spi connection at 80Mhz to reduce the redraw flicker. Overall nice display especially with the FPC cable for easy seemless connection to a custom board.

the touchscreen didnt work no matter the driver i used so i contacted the supplier and received 2 messages before i sent them pictures and showing them i know what im doing. they quite responding when they seen i know my stuff... guess i need to find a diffenet lcd or take another chance on ordering the same. but the fact they quite messaging to resolve the issue is kinda frustrating...