用于C语言硬件编程，HC-SR04超声波_原理图，对于编程实现其功能提供支持。(It is used for C language hardware programming, hc-sr04 ultrasonic-schematic diagram, and provides support for programming and realizing its functions.)

gl3510sch 我也不知道该怎么说明，真心不懂，还要强制打字。(Gl3510 schematic diagram)