Trash-picking RGB-LED display HUB75e interface driver board

    The director recently picked up two RGB LED displays from a treasure shop. Looking at the screens that should be the kind of backpack advertisements on the street, he tested them and only a few red lamp beads did not light up. The effect is still very good. Original factory The driver board requires 4G network to update the image. You need to find the original service provider to update the firmware before it can be used, so I used esp32 to directly make a replaceable driver board.

    The screen parameters are two 96X64 32-scan splicing screens with HUB75e interface. The splicing sequence is a bit strange. It is driven by the ESP32-HUB75-MatrixPanel-I2S-DMA library, but it needs a small modification to drive it normally. I found a branch of the Adafruit_GFX library that supports Unicode and modified it. The GB2312 font library was integrated into it and can directly support Chinese display. (If you don’t need Chinese display, it’s better to use the latest Adafruit_GFX official library) Please go to the “Explosive Modification Workshop” official account to download these two modified libraries.

Screen connection: https://item.taobao.com/item.htm?spm=a1z10.3-c.w4002-13969304973.11.7ef02132tfnBi6&id=673459747958

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Fix bug

The original third button IO34 does not have internal pull-up and pull-down, and no pull-up resistor is added, so it cannot be used at all (I was stupid).

Modify it to IO33. The GIF shows that in the test code, the 32-line IO definition changes 34 to 33.

If you have already soldered the old version of the board, just use flying wires to connect a pull-up resistor to IO34.

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It’s this screen with a 3D printed front frame. It’s very nice and only costs 65 yuan.

The circuit is very simple, it is just a basic esp32 development board with a different shape.

Can directly replace the original driver board.

The two sides should be half-holes. I made Changkong for free and cut it myself when I came back, and it turned into half-holes.