* 因为按键另一端接 GND，按下时 GPIO4 被拉到低电平。 * 没有按下时，ESP32 内部上拉电阻把 GPIO4 维持在高电平 ...

* * delay() 会让 CPU 空转等待，期间不能执行其他代码，称为“阻塞”。 * * 硬件定时器由独立硬件模块驱动，到时间就触发中断 ...

Abstract: This article deals with experiences with the development of applications of the ESP32 microcontrollers and provides a comprehensive review of the possibilities of applications development on ...

Abstract: Intelligent reflecting surface (IRS) is an enabling technology to engineer the radio signal propagation in wireless networks. By smartly tuning the signal reflection via a large number of ...