3Pcs 1.28 Inch TFT LCD Display Module Round GC9A01 Driver IPS LCD Screen Module Circular 4 Wire SPI Interface for Arduino

I bought this 1.28" display because it doesn't have the connector pins extending below the bottom of the display. The displays with the connectors extending below the display (typically on a blue PCB) work well with the Adafruit GC9A01A library, but I couldn't get these JESSINIE displays to work with the same hardware, a Seeed Studio XIAO ESP32-S3. Joshua C.'s review gave me the idea to look at the Adafruit library code. I changed the SPI Default frequency, which was set at 24000000 in their library by overriding their definition in the example program code. I started with 800000 and it worked right away. I increased the clock speed until it stopped working; it was still working reliably at 21000000 but this may change with variations in hardware. Change the speed until it works. I made the following changes to their example: // the following pinouts are for the Xiao ESP32-S3, with hardware SPI. I used three digital I/O pins for the TFT control #define TFT_RST D0 //added a TFT reset #define TFT_DC D1 #define TFT_CS D2 #define SPI_DEFAULT_FREQ 21000000 //was 24000000 Adafruit_GC9A01A tft(TFT_CS, TFT_DC, TFT_RST); //modified the display constructor to add the RST pin

These work great and are easy to use.

None of the three are working so far with my existing demo for the GC9A01 controller. I have the TFT_eSPI Smooth_Graphics/AntiAliasedClock demo running on 1.28” displays, of the type that have pins on them and which use the same controller, connected to an esp32s2-mini processor. I added code to light the built-in led during NTP request processing. That code executes without error on the Jessine displays but nothing is displayed - the blue led flashes as NTP requests are processed and things appear to be proceeding as expected but nothing is displayed. The backlight does come on. I have experimented with the SPI_FREQ and even added a reset signal but no joy. The other displays continued to work with these test changes tho slowly as expected. I have verified that both the power and signaling are 3.3v. None of these will display anything.

Seems to work well. Wish the dimensions between the mounting boss was documented! Update: The mounting boss are 12mm x 27mm apart.

Little tough to get going, have to make edits to library. Library updates will reset edits, so back up your settings. Had to lower my spi speed in user settings for 3 displays at once, or even if you have long wires.

Pretty good. You can use waveshare’s 1.28” display driver. I just had to change the spi data mode to spi_mode0 in dev_config.cpp. And then everything started working.

Ok bad up front you’ll face head winds with community support. Frustrating as that maybe, the tech support from supplier was nothing short of exemplary. Elated to be wrong about my first review. However once it works this thing is going to set your next project to a different level of amazing.

Pls help

I previously was using a different version of these display modules but the extra Z height from the soldered header on the PCB cutout was annoying for integration. I bought this set instead since it cleanly routes the connection to the back of the display, and also comes with the bonus of having threaded posts already applied for mounting. I've confirmed the display works with both the Adafruit GFX and LovyanGFX libraries using an ESP8266 dev board. There are a few things that would improve these modules. First, I think it would be nice for the provided cables to use male dupont connections instead of female, so they can be connected to a breadboard. For integration, I'm going to crimp on my own connector anyways, so it would be nice if the out-of-the-box connection was more useful during the prototyping stage. Second, the mounting posts do not have end stops. If you use a screw that is too long, you can accidentally screw through the PCB and push out the display and damage it. I accidentally did this but caught it and stopped myself before destroying the display. Ideally the threaded posts should be closed at the end. One smaller nitpick, the provided documentation (linked under "Product description" in case you initially missed it like I did) does not show the distance between the threaded posts. There is enough information to calculate it from what's given and you can verify with a caliper, but it would be nice to have that information provided as that is the most important measurement for mounting this display centrally on some object. English documentation would also be a plus but not a huge deal. If you are having troubles, make sure your connections between the display and your microcontroller are not too long, that you are correctly toggling Chip Select, and that your SPI interface is configured correctly with your library. In particular I tried inserting wire extensions into the provided cable to connect it to a breadboard, but this caused the connection length to be too long (or maybe the contact was flakey and it would have worked fine with a proper wire) and the display wouldn't process commands until I connected it directly to the microcontroller without any extensions.