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re:GC9A01 Round LCD with ESP32 & Arduino

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Joined: 2 years ago
Posts: 16
Topic starter  

Hi folks,

In the DBWS video around 29:20 Bill points out an artifact where the inner ring of numbers is erased as the dial moves.

I can duplicate the examples. But for me in the animated dial example when the inner ring is erased I get blocks of white pixels.

When I read from the GC9A01 I get f's. I suspect there is a pull up on my board that is not in the demo version. But it could be other things.

Bodmer (TFT_eSPI, author) mentions that his round display possibly has config pins that do not allow bi-direction data on the SDA pin.

I've duplicated this on my Uno and LOLIN ESP D32-Pro, with the waveshare display and a no-name version from alibaba.

I was wondering if anyone has been able to read from the GC9A01 ? If you've got it to work could you share your hardware?

Father of a miniature Wookie
Joined: 4 years ago
Posts: 7283

I haven't 'played' with this device yet, but did notice when searching for sources that there seemed to be a few possibly different boards out there. Bill points out two of them in the video but I 'think' I saw even more. Or not 😀 

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.