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Real-time addressable LED strip control using ESP8266 via web interface

Features

  • Synchronization between all connected devices
  • Desktop and mobile web interface
  • Сhoosing themes
  • Brightness adjustment
  • Loop duration adjustment
  • Color change (thanks to NC22 for the colorpicker)
  • Selection of different effects (more will be added)

Hardware

  • ESP8266-based board
  • Addressable LED strip (WS2811, WS2812, WS2812B)
  • 100 to 500 Ohm resistor (preferably)
  • 3.3V to 5V power supply

Wiring diagram

scheme

Software

The web application is a single page application that is written in vanilla JS. So it is quite lightweight

ESP8266 is a web server. After your browser downloads the web files, the connection immediately switches to the websockets protocol. Over this, synchronization between clients was implemented.

Note, although the brightness slider use a delayed event handler (to prevent from flooding the ESP with too many requests too quickly), during execution "heavy" effects (they are marked in the code) with a quick change of brightness, ESP may be unavailable (until effect loop is completed) and messages will go to the senting queue.

Installing

The first thing you need to do is install the Arduino IDE , BUT:

At the moment, latest Arduino IDE (2.0) does not support the file system plugin (required to upload web files to ESP flash memory). See relevance.
Therefore, you need to install version (1.8.x), however:

You can try the simplified version which does not depend on the file system plugin but with a minimalistic interface. When you are sure everything is working, I strongly recommend installing the main version!

The ESP8266 boards will need to be added to the Arduino IDE which is achieved as follows.
The ESP8266 filesystem plugin (you will find the installation instructions in the same place).

Dependency only on the following libraries:

In the end

  • Connect your ESP8266 to your computer
  • Open ESP8266-LED.ino and update the following lines:
#define LED_COUNT 60 // the number of pixels on the strip
#define DATA_PIN 14 // (D5 nodemcu) pin where is connected the data pin

const char* ssid = ""; // SSID of the access point
const char* password = ""; // password (if the access point is open, leave it empty)

IPAddress Ip(192,168,100,10); // IP address for your ESP
IPAddress Gateway(192,168,100,1); // IP address of the access point
  • Upload the sketch
  • In the IDE's top menu, select tools -> ESP8266 Sketch Data Upload to upload files from the data directory to ESP flash memory
  • Open the serial port monitor (if the connection is successful, IP your ESP will be displayed)
  • Open the browser and enter the IP address

Happy use ッ