ESP32 & ESP8266 Connectivity · Intermediate · Update path
ESP8266 LAN Firmware Update
The cable-free update path on the ESP8266, using the updater the core ships.
Firmware status: Generated from this project's own pin map and compiled with arduino-cli for esp8266:esp8266:nodemcuv2 before publication; bench validation on your hardware is still required.
Board: ESP8266 (NodeMCU v3 / Wemos D1 mini) · ESP8266EX @ 80 MHz · 3.3 V logic · build for esp8266:esp8266:nodemcuv2.
What you will build
An ESP8266 serving an authenticated upload page that flashes new firmware over the local network.
Components
- ESP8266 board
- USB cable for the first flash
- An exported .bin
Pin map for this build
| Sketch constant | Pin | What it is |
|---|
Tools
- USB programming cable
- Multimeter
- Current-limited bench supply (for anything that switches a load)
- Small screwdriver and wire cutters
Build sequence
- Set OTA_PASSWORD and flash over USB once.
- Open the board's address and log in with the password.
- Upload a .bin exported from the IDE and watch the progress page.
- Re-read the boot banner to confirm the new version is running.
Test and expected result
The login page appears, an upload completes, and the device boots the new firmware without a cable.
Acceptance checks
login required, upload completes, new firmware boots
Safety and limits
The upload page is authenticated but not encrypted. Keep it inside your own network and change the password from the sketch default.
Hardware scope
ESP8266 HTTP update server, password authentication, restart into the new image.
Connection diagram
Download the connection diagram (SVG)
Download the Arduino sketch (E12_esp8266_lan_firmware_update.ino)
Guide source: the sketch on this page was generated from the pin map above and compiled for esp8266:esp8266:nodemcuv2 before publication.
Related projects
- ESP32 Captive Portal Wi-Fi Manager — Boot the ESP32 with no credentials and configure its network from a phone, with the portal saved to flash.
- ESP8266 Config Portal — The same idea on the cheapest board that can do it: an ESP8266 that configures itself from a browser.
- ESP8266 Sensor Portal Logger — A battery-minded sensor node you configure in the field, with the reading shown on its own setup page.