ESP8266 is a very cheap serial to WiFi module running on 3.3V With this adapter you can connect the module to 5V FTDI adapter directly, just connect, open COM terminal and you can type AT commands. That's it, it's great for beginners who want to explore this WiFi module or simply to test if the module is working without worrying about wiring or voltage levels. The adapter has 3.3V regulator on board providing up to 800mA for the module. Also the communication is level shifted to 3.3V so it's safe to connect the module to 5V FTDI adapter. The chip_enabled is already pulled up and it also has a reset button on top. Just plug and play. If your FTDI adapter has option between 5V and 3.3V choose 5V.
The adapter can also be plugged into a breadboard, all pins are clearly marked, make sure you use 3.3V logic level when playing with GPIO. The adapter comes with optional ESP8266 module or FT232RL FTDI adapter.
You can use this adapter to connect the module to the 5V Arduino too. Connect VCC to Arduino 5V, GND to Arduino GND,
The board schematics.
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