Waveshare provides a demo project for this dual lcd display module to show animated eyes, or at least I think that's what it does. Unfortunately, not only will the project not compile, even after fixing it, it doesn't do anything.The problem starts with their use of an untested modified older version of the TFT_eSPI library, adding support for this display (GC9D01). I say untested because it doesn't compile from their own provided code, as a result of initialization changes made at some point to the github library. The latest version on github includes another Waveshare display GC9A01 (1.28" 240×240) but not GC9D01 (0.7" 160×160). These do not appear to just be different in size. There are at least 4 files that have been modified (see below), but I have not yet gone thru these changes to add it to the latest version of this library. I'm not sure why Waveshare haven't done this themselves.When I reached out to Waveshare about the problems they indicated that, contrary to the product description, they only support the ESP32-C3. I attempted testing this with an ESP32-S3 Uno. I found some information seemingly related to this kind of problem on the ESP32-S3 Uno, that suggested a need to jumper one pin to another, but this didn't resolve the issue. So, I got an ESP32-C3. This also doesn't work, but rather than doing nothing, it flashes the left eye's backlight on an off repeatedly.A few notes that might help, should you endeavor to delve in:- Files that were modified (at least): TFT_config.h, TFT_eSPI.cpp, User_Setup.h, User_Setup_Select.h- Files that were added (at least): TFT_DriversGC9D01_Init.h and GC9D01_Rotation.h- Modify the init function contained in main.ino as follows: void pwm_init() { ledcAttach(BL1, 1000, 8); ledcAttach(BL2, 1000, 8); }- Waveshare com /wiki/0.71inch_DualEye_LCD_Module indicates: - USB CDC On Boot: "Enabled" - Flash Size: "4MB(32Mb)" - Partition Scheme: "Huge APP (3MB No OTA/1MB SPIFFS)" - To accommodate the large size this demo compiles to... 1,758,732 bytes. . You'll need an ESP32 with sufficient storage for this.I also tried basic example code for TFT_eSPI... "Hello World" text, for example, but these also did not work. I have yet to try this with the ESP32-C3.Unfortunately, Waveshare seem uninterested in resolving the issues, and weren't even receptive to my offer to help them resolve it. "You will need to port and debug it yourself, or test it according to the physical objects and examples we provide.". Unable to get this to work, and unable to get help form Waveshare, I can't help but give this 1 star.I consider figuring this out to be a challenge... should I figure it out at some point, I'll update this review.

This is a very interesting product, and it was a chore to configure it. Someone with actual artistic talent (not me) could really play on the "shifty eyes" that these provide. I tested other GC9D01 displays the same weekend and thought about compasses, directional arrows, imitating old timey TVs, modeling RADAR, mimicking a HAL9001 eyeball, mocking the view through a telescope/microscope for education, building instrumentation and gauges, and many other cases, but if you put two of them together, it's pretty clear that they're just destined to be eyes. Maybe they're friendly eyes on a robot or scary eyes in a Halloween exhbit. I just focused on making sure they worked, and they did!Waveshare has provided appropriate documentation on their wiki/0.71inch_DualEye_LCD_Module page, but it's admittedly a bit much for some hobbyists.The device presents as two completely different GalaxyCore GC9D01 controllers on a shared SPI bus. The GC9D01 always thinks it's talking to a square screen; it doesn't know that some of the pixels are missing. So your designs have to compensate for that. In software, you basically present two completely separate bitmapped screens, each relying on the independent RAM in the video memory hosting the 160x160x18bit (RGB666) frames.They're completely independent; it's not like you can scroll pixels from one "eye" to another without either bringing it back from the video RAM into the host to push to the other or just keeping the frame buffers for both in host memory to begin with. As SPI buses do, they share CLK, DIN (relative to the screen), and Data/Command pins and signaling, so budget your bus bandwidth to accommodate two screens needing to be fed. It's up to your software to manually manage the chip selects as well as the independent backlights and resets. You can see this in their examples, though I bypassed those and went straight to the NuttX drivers for these parts.I was able to get a test pattern animated in both "eyes" on an ESP32-S3, though I modified the NuttX GC9A01/GC9D01 drivers to do so instead of relying on the provided demo software as it was for the Arduino environment, and the Arduino Environment for ESP32 right now is a bit of a mess of incompatible changes with Espressif making recent changes and the Arduino world ignoring the required changes. ESP-IDF for This isn't up to GC or WS, though. If you understand the driving ecosystem, it all works fine. NuttX works, and ESP-IDF has a component registry for lcd_gc9d01.These look great. My objection, like all the Waveshare products that weekend, was that it's unfortunate that they're 50% higher here than on Waveshare's own store, and I docked them for that reason. Amazon's convenience, delivery, and return policy is worth something; it's up to you to decide how much.Waveshare 0.71inch Double Eye $23.99

Der Artikel wird ohne jegliche Hinweise oder Verlinkung auf eine Dokumentation geliefert. Nach eigener Suche im Web (Stichwort: "Waveshare Wiki") habe ich dann bei Waveshare eine Dokumentation und auch eine Demo gefunden.Die Demo setzt einen sehr alten Stand der ESP32-Bibliothek (2.0.17) voraus und erzeugte, trotz 1:1 Nachbau des Beispiels mit einem ESP32-C3-Zero, keinerlei Ausgabe. Auch alternative Experimente nach anderen Videoanleitungen mit einem ESP-WROOM-32 brachten kein Ergebnis. Der Waveshare-Support hat mir zwar auf Anfrage den Tipp mit der alten Version der ESP32-Bibliothek gegeben, mehr kam aber nicht.Fazit: Die kleine Platine kommt ohne einen Hinweis auf eine Dokumentation, diese muss man sich selbst zusammensuchen. Trotz mehrtägiger Versuche ist es mir am Ende nicht gelungen auf dem Display irgendetwas anzuzeigen, daher gibt es von mir auch nur einen Stern.

Ich habe das "Waveshare 0.71inch Double Eye Round LCD Display Module, 160×160" kostenfrei über Amazon Vine zum testen bekommen.Da ich mich in nächster Zeit mehr mit 3D-Druck befassen möchte, kamen mir die "Augen" als willkommenes Spielzeug daher.Auf der Rückseite der Doppel-Display-Platine befinden sich zwei Gewindebuchsen (ich schätze M3, könnte aber auch M2,5 oder M2 sein - das muss ich noch nachmessen), womit man das Display problemlos an 3D-Drucken oder Holzbrettern befestigen kann. Da kommen wir auch zum nächsten Punkt: Es wäre wirklich praktisch gewesen, wenn die beiden entsprechenden Schrauben bereits beiliegen würden.Passend zu den beiden runden Displays gint es zwei Linsen, die man plan auf diese auflegen kann.Super Sache, allerdings wäre es noch praktischer gewesen, wenn man diese über Laschen anklippen oder mit Löchern anschrauben könnte.Hier habe ich noch keine Idee, wie ich das verbinde. Da die Linsen einen ca. 1mm breiten, flachen Rand umlaufend haben, kann ich hier vielleicht im 3D-Druck eine passende Fläche konstruieren.Ich habe das Modul zwar problemlos mit einem ESP32-C3 verbinden, bisher aber nicht ansprechen können.Der Beispiel-Sketch auf der Wiki-Seite des Herstellers funktioniert mit Arduino IDE2.3.4 und der aktuellel LVGL-, sowie TFT_eSPI-Library leider nicht auf Anhieb.Als Nicht-Programmierer mus sich jetzt abwarten, und schauen, ob ich ein neueres Beispiel irgendwo finde, um die Display-Augen benutzen zu können.Folgende Fehlermeldungen schmeißt die Arduino-IDE beim Versuch des Kompilierens vom Beispielcode aus:0.71inch-DualEye-LCD-Module-Demoexamplemainmain.ino: In function 'void pwm_init()':0.71inch-DualEye-LCD-Module-Demoexamplemainmain.ino:417:3: error: 'ledcSetup' was not declared in this scopeWenn jemand dazu ne Lösung findet, bitte gerne irgendwo hier mitteilen :)Beim Einstecken meines ESP32-C3 leuchtet direkt eins der beiden Displays. Das finde ich etwas ungewohnt, da ich eher erwarten würde, dass beide leuchten.Ob es sich hierbei um einen Defekt handelt sehe ich erst, wenn ich es geschafft habe etwas Beispielcode für das Display zu kompilieren.Ansonsten macht das Display mit der beiliegenden Kabelpeitsche und den beiden Linsen einen guten Eindruck :)

I got these round LCD modules for my second robot project, and they’re fantastic for adding personality. The customization options are impressive, and the colors are vibrant on the IPS panel. I tested them with an ESP32 board, and they work as expected so far. I haven’t fully integrated them into the robot yet, but initial tests show they’re responsive and reliable. They’re a solid choice if you’re into robotics or creative builds.