A multifunctional LED dot matrix screen based on ESP32 can display lyrics

The dot matrix screen is composed of three parts: ESP32 control board, base board and module board. The module board needs to be inserted into the base plate, and then the base plate and the base plate are welded using headers to cascade. The difficulty of the project is on the Android APP. For a person who can’t write interfaces, I want to make the interface more beautiful. It takes too much time. The interface has been changed again and again. It has not achieved the effect I am satisfied with, so I have to make do with it. Please see the full effect demonstration here: [https://www.bilibili.com/video/BV1dX4y1R7UC/](https://www.bilibili.com/video/BV1dX4y1R7UC/) Open source GitHub address: [https://github.com/literem/led-matrix/](https://github.com/literem/led-matrix/) Once you enter the project source code, you can see the link. ### Hardware physical picture The effect of cascading eight 16x16 dot matrix modules:   No cascading effect:    ### Dot matrix control panel Using ESP32-WROOM-32E microcontroller, the GBK font used for dot matrix screens is placed inside, saving the trouble of external font chips. It supports battery power supply and external TypeC or DC interface input, and there is also a DC interface for charging the battery. The reason why the external power supply and charging interface should be separated is to avoid charging the battery all the time when the external power supply is used. Of course, you can also add a mos switch to control whether to charge, but this requires battery voltage acquisition and mos control circuits, as well as logical judgment of the code. , it was quite troublesome, so we simply separated. The chip on the right side of ESP32 is AT24C32, which is an E2PROM that stores dot matrix screen information. There is also a clock chip RX8025, which can be easily purchased from a certain store for more than one yuan. Next to the TypeC port is the CH340C chip, which downloads code for the ESP32. There are four buttons on the top, the one on the left is reset, and the other three buttons have not been developed for function and are just decorations at the moment.  ### Dot matrix base When welding the base plate, we use a 2.54mm 2x9P patch header. When welding, insert it into the dot matrix module first, align it with the base plate, then weld the outer contacts, and then pull out the dot matrix module and solder the inner contacts. point.  ### Dot matrix module board  ### Control software interface Connect device interface  Functional interface