#The 7th LiChuang Electronic Competition#The Most Poor 68+4 Mechanical Keyboard PRO

If the competition is over, please jump to the open source platform to view the latest version. If the competition is over, the scoring will be locked. At that time, this layout cannot be edited. The most beggar 68+4 mechanical keyboard PRO also has an English version for communication with foreign friends GaiZhongGai-Keyboard-68+4PRO - EasyEDA open source hardware lab (oshwlab.com) Regarding the content, the following description is not all of this keyboard. There is also a sister project "The Most Beggar 17+4+Touch Mechanical Keyboard PRO", and the two are better for consumption together. Coincidentally, the two competitions are now being held at the same time, so the two projects are each invested in different tracks. In order to avoid duplication of content, the focus is different. Preface Many readers who are not in the computer installation circle may not understand the meaning of this beggar among beggars. This word is more used on computer motherboards and graphics cards. It refers to the beggar version of the beggar version, the low configuration of the low configuration, and the shrinkage of the shrinkage, which is homophonic to the former CCTV advertisement. And I am not here for sales promotion, so it is okay to use the most as the project name. The benefits of low configuration are obvious, that is, low cost, and students love it the most. We are all experienced in burning money in electronics, but as a teacher, I hope you will not cut back or even skip meals when you make room for living expenses. You can ask your classmates to share the cost, or use the extra PCBs to assemble and post them on Xianyu to make up for the loss (investment is risky!!!), but remember to comply with the open source agreement. Here is a comparison table of commonly used MCU configurations with the QMK solution. Model STM32F103C8T6GD32F103C8T6ATMEGA32U4-AUCH551G Lichuang No. C8734C77994C44854C108958 Single Price (June 24, 2022) ￥42.58￥14.35￥129.92￥2.69 Package LQFP-48LQFP-48QFP-44SOP-16 I/O Number 37372612.5 (RST pin can only be read, as half) Bits 32-Bit32-Bit8-Bit8-Bit Core ARM® Cortex®-M3ARM® Cortex®-M3AVRC51ROM64kB64kB32kB10kBRAM20kB20kB2.5kB0.75kBEEPROMnone (but can be simulated with FLASH)none (but can be simulated with FLASH)1kB128BThe comparison shows that the configuration is not much different, mainly because there is no ecosystem. When the keyboard was first released, I planned to open source the code, but I felt that it was not popular enough, and I was afraid that someone would take it for profit and delete the original author's information. However, the "chip shortage" caused the price of the above microcontrollers to rise, and my project became more popular. And now there is the spiritual and material support of loyal fans. Please help communicate with the sellers on Xianyu to add the open source label, and reward the author with a fixed amount after the sale. With such support, can the update be diligent? Thank you for your support along the way~1. Project function introduction Based on my old project "The Most Beggar 61+3 Mechanical Keyboard" upgrade. This meets my initial need of having a hub on the keyboard. Since there is no place for the third USB socket, an SD card reader is placed under the space. The layout is modified, the keyboard backlight is changed to RGB, and OpenRGB is connected. Chinese support is also added to the project. Under the poor peripherals of CH551G, a lot of optimizations are made to meet the strict timing requirements of WS2812. Normal state