Adafruit Feather HUZZAH ESP8266 User Manual

it, using two resistors. You cancheck out the wiring diagram here (use the VBat pin to
measure)(https://adafru.it/jCY) and the code here(https://adafru.it/NMb).
ENable pin
If you'd like to turn off the 3.3V regulator, you can do that with the EN(able) pin. Simply
tie this pin to Ground and it will disable the 3V regulator. The BAT and USB pins will
still be powered
Alternative Power Options
The two primary ways for powering a feather are a 3.7/4.2V LiPo battery plugged into
the JST port or a USB power cable.
If you need other ways to power the Feather, here's what we recommend:
For permanent installations, a 5V 1A USB wall adapter(https://adafru.it/duP) will
let you plug in a USB cable for reliable power
For mobile use, where you don't want a LiPoly, use a USB battery pack!(https://
adafru.it/e2q)
If you have a higher voltage power supply, use a 5V buck converter(https://
adafru.it/DHs) and wire it to a USB cable's 5V and GND input(https://adafru.it/
DHu)
Here's what you cannot do:
Do not use alkaline or NiMH batteries and connect to the battery port - this will
destroy the LiPoly charger and there's no way to disable the charger
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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