改造普通灯变成WiFi控制灯，在同一WlAN环境下直接通过手机操控开灯与关灯。 电磁式继电器一般由铁芯、线圈、衔铁、触点簧片等组成的。只要在线圈两端加上一定的电压，线圈中就会流过一定的电流，从而产生电磁效应，衔铁就会在电磁力吸引的作用下克服 ...

本实例代码已在STM32F407ZGTx上测试通过，如在其它型号上运行，可以按以下方法进行简单的移植。 1、用STM32CubeMX配置工程，使能与ESP8266相连接的串口的接收DMA功能，并且使能全局中断。 2、复制esp8266.c、esp8266.h、mqtt.c、mqtt.h到工程相应目录。

This pin is on the rear of the ESP8266 module, and on many development boards, it isn’t even connected. That’s because its internally hooked up to the ESP8266’s SPI flash chip, and using it ...

the ESP8266 has been decapped; are there any die inspection wizards who can back up a claim of 5V tolerance for the GPIO? We’d also be interested in hearing any ideas for stress testing pin ...