这是为树莓派4设计的保护壳，壳体上预留了XLR风格的面板接口开孔。

初步物料清单：
树莓派 4
TTL 转 RS485 适配器https://www.amazon.com/gp/product/B0B28LB3RK
USB 音频适配器https://www.amazon.com/dp/B07RV6VBNR
90 度 USB-C 接口https://www.amazon.com/gp/product/B086W2LTGY
微型 HDMI 转 HDMI 适配器https://www.amazon.com/gp/product/B08QFM1ZL2
HDMI 面板安装支架https://www.amazon.com/gp/product/B092W917NG
RJ45 母型面板安装接口https://www.amazon.com/gp/product/B0BC8Z87W5
另外——
108 度 USB 适配器https://www.amazon.com/gp/product/B0BZ4M7FYH
各类黄铜嵌件https://www.amazon.com/gp/product/B07MWBJB67
M2.5、M3、M4、M5、M6型嵌入式螺母https://www.amazon.com/gp/product/B0CRV87FC8
M2.5 螺丝/螺母套装https://www.amazon.com/gp/product/B0B3J58MMW
M3、M4、M5平头螺丝套装https://www.amazon.com/gp/product/B0734Q7DDG
M2六角头螺丝https://www.amazon.com/gp/product/B094NT4BZ2
粉丝https://www.amazon.com/gp/product/B07KRSF8RZ