Adafruit Feather HUZZAH ESP8266 User Manual

Do not use 7.4V RC batteries on the battery port - this will destroy the board
The Feather is not designed for external power supplies - this is a design decision to
make the board compact and low cost. It is not recommended, but technically
possible:
Connect an external 3.3V power supply to the 3V and GND pins. Not
recommended, this may cause unexpected behavior and the EN pin will no
longer. Also this doesn't provide power on BAT or USB and some Feathers/
Wings use those pins for high current usages. You may end up damaging your
Feather.
Connect an external 5V power supply to the USB and GND pins. Not
recommended, this may cause unexpected behavior when plugging in the USB
port because you will be back-powering the USB port, which could confuse or
damage your computer.
Using NodeMCU Lua
Each Feather HUZZAH ESP8266 breakout comes pre-programmed with NodeMCU's
Lua interpreter. As of this writing, we ship with NodeMCU 0.9.5 build 20150318
powered by Lua 5.1.4 but it may be more recent
Lua is still a work in progress, so we strongly recommend visiting NodeMCU and upd
ating your Lua version to the very latest as they have the ability to make you the latest
continuous build(https://adafru.it/wAq). Then follow their guide on how to update
Lua!(https://adafru.it/wAr)
The Lua interpreter runs on the ESP8266 and you can type in commands and read
out the results over serial. In order to upload code to the ESP8266 and use the serial
console, connect any data-capable micro USB cable to the Feather HUZZAH and the
other side to your computer's USB port. Install the required CP2104 USB driver to
have the COM/Serial port appear properly(https://adafru.it/jCs)
Don't forget to visit esp8266.com for the latest and greatest in ESP8266 news,
software and gossip!(https://adafru.it/f1F)
•
•
•
Don't forget to install the USB driver for the CP2104 USB-to-Serial chip!
©Adafruit Industries Page 26 of 53

Adafruit Feather HUZZAH ESP8266 Specifications

General

Brand	Adafruit
Model	Feather HUZZAH ESP8266
Category	Microcontrollers
Language	English

Summary

Pinout Guide

Power Pins

Details pins for power and logic, including GND, BAT, USB, and EN.

Logic Pins

General purpose I/O pins with 3.3V logic, not 5V safe.

Serial Pins

Pins for serial communication and bootloading via USB-Serial chip.

I2C & SPI Pins

GPIO Pins

Details 9 general purpose GPIO pins, their special functions and boot mode behavior.

Power Management

Battery and USB Power

Powering the Feather via MicroUSB or LiPo battery with auto-switching.

Power Supply Options

Alternative Power Sources

NodeMCU Lua Programming

Serial Console Setup

Guide to connecting and using serial terminal programs like PuTTY.

WiFi Scanning and Connection

WebClient HTTP Example

Arduino IDE Usage

USB Driver Installation

Instructions for installing CP2104 USB-Serial drivers, especially for macOS.

IDE and ESP8266 Board Setup

ESP8266 Board Configuration

Arduino WiFi Connection

ESP8266 Troubleshooting FAQ

Pin Behavior and Boot Modes

Explains pin behavior during boot and potential issues.

Board Crashing and Resetting

Discusses power failure as a common cause for board crashes.

Serial Port Detection Issues

Troubleshooting steps for finding the serial port on a computer.

Mac Compilation Error Fix

Fixes for 'no such file' errors when compiling on macOS.

Serial Console Gibberish

Arduino IDE Upload Problems

Stuck in Bootloader Mode

Solutions for being stuck in bootloader mode and unable to upload.

Lua Command Response Fixes