Welcome to ESP8266 Arduino Core’s documentation!

Contents:

• Installing
  • Boards Manager
  • Using git version
• Reference
  • Interrupts
  • Digital IO
  • Analog input
  • Analog output
  • Timing and delays
  • Serial
  • Progmem
  • C++
• Libraries
  • WiFi(ESP8266WiFi library)
  • Ticker
  • EEPROM
  • I2C (Wire library)
  • SPI
  • SoftwareSerial
  • ESP-specific APIs
  • mDNS and DNS-SD responder (ESP8266mDNS library)
  • SSDP responder (ESP8266SSDP)
  • DNS server (DNSServer library)
  • Servo
  • Other libraries (not included with the IDE)
• File system
  • Flash layout
  • SPIFFS and LittleFS
  • SDFS and SD
  • SPIFFS file system limitations
  • LittleFS file system limitations
  • Uploading files to file system
  • File system object (SPIFFS/LittleFS/SD/SDFS)
  • Filesystem information structure
  • Directory object (Dir)
  • File object
• ESP8266WiFi
  • Introduction
  • Class Description
  • Diagnostics
  • What’s Inside?
• OTA Updates
  • Introduction
  • Arduino IDE
  • Web Browser
  • HTTP Server
  • Stream Interface
  • Updater class
• PROGMEM
  • Intro
  • Declare a flash string within code block.
  • Functions to read back from PROGMEM
  • How do I declare a global flash string and use it?
  • How do I use inline flash strings?
  • How do I declare and use data in PROGMEM?
  • How do I declare some data in PROGMEM, and retrieve one byte from it.
  • In summary
• Using GDB to debug
  • CLI and IDE Note
  • Preparing your application for GDB
  • Starting a Debug Session
  • Example Debugging Session
  • ESP8266 Hardware Debugging Limitations
• Boards
  • Generic ESP8266 Module
  • Serial Adapter
  • Minimal Hardware Setup for Bootloading and Usage
  • ESP to Serial
  • Minimal
  • Improved Stability
  • Boot Messages and Modes
  • Generic ESP8285 Module
  • ESPDuino (ESP-13 Module)
  • Adafruit Feather HUZZAH ESP8266
  • Invent One
  • XinaBox CW01
  • ESPresso Lite 1.0
  • ESPresso Lite 2.0
  • Phoenix 1.0
  • Phoenix 2.0
  • NodeMCU 0.9 (ESP-12 Module)
  • NodeMCU 1.0 (ESP-12E Module)
  • Olimex MOD-WIFI-ESP8266(-DEV)
  • SparkFun ESP8266 Thing
  • SparkFun ESP8266 Thing Dev
  • SparkFun Blynk Board
  • SweetPea ESP-210
  • LOLIN(WEMOS) D1 R2 & mini
  • LOLIN(WEMOS) D1 mini Pro
  • LOLIN(WEMOS) D1 mini Lite
  • WeMos D1 R1
  • ESPino (ESP-12 Module)
  • ThaiEasyElec’s ESPino
  • WifInfo
  • Arduino
  • 4D Systems gen4 IoD Range
  • Digistump Oak
  • WiFiduino
  • Amperka WiFi Slot
  • Seeed Wio Link
  • ESPectro Core
  • ITEAD Sonoff
  • DOIT ESP-Mx DevKit (ESP8285)
• FAQ
  • I am getting “espcomm_sync failed” error when trying to upload my ESP. How to resolve this issue?
  • Why esptool is not listed in “Programmer” menu? How do I upload ESP without it?
  • My ESP crashes running some code. How to troubleshoot it?
  • How can I get some extra KBs in flash ?
  • About WPS
  • This Arduino library doesn’t work on ESP. How do I make it work?
  • In the IDE, for ESP-12E that has 4M flash, I can choose 4M (1M SPIFFS) or 4M (3M SPIFFS). No matter what I select, the IDE tells me the maximum code space is about 1M. Where does my flash go?
  • I have observed a case when ESP.restart() doesn’t work. What is the reason for that?
  • How to resolve “Board generic (platform esp8266, package esp8266) is unknown” error?
  • How to clear TCP PCBs in time-wait state ?
  • Why is there a board generator and what about it ?
• Exception causes
• Debugging
  • Introduction
  • Informations
• Stack Dump
  • Introduction
• Using with Eclipse
  • What to Download
  • Setup Arduino
  • Setup Eclipse
  • Eclipse wont build