How to get expensive magnetized tools for easier assembly and disassembly of screws, nuts... try it yourself or buy expensive tools. This is how I do it with old used electromagnetic coil. This is a copper

What Will I Learn? 认识ESP8266 WIFI模块 用ESP8266 WIFI模块创建一个热点 Requirements ESP8266 -12F Arduino IDE （版本要大于1.6.7） ESP8266 library Difficulty Basic ​ Tutorial Contents 一、认识ESP8266 wifi模块