How to use a USB-TTL adapter to programme ESP8266 MCUs with Arduino IDE
ESP8266 datasheet What to connect where to get a similar experience to programming an Arduino – with automatic boot selection of the ESP8266 chip to enable flashing and then re-booting into run mode after programming when using a USB-Serial adapter such as FTDI, CH340, CP210x, FT232RL etc. Note that some adapters have a selectable 3v3/5v …