ESP8266 Multi-Device Synchronized Lights

Ultra-precise (<1ms) synchronized LED lighting system using ESP-NOW mesh networking on ESP8266 microcontrollers.

Description

This project implements a wireless mesh network of ESP8266 devices that control LED strips with sub-millisecond synchronization. Using ESP-NOW protocol, multiple ESP8266 nodes coordinate to display perfectly synchronized lighting effects across all connected devices.

Features

• Sub-millisecond Synchronization - Lights sync with <1ms precision
• ESP-NOW Mesh - Wireless coordination without WiFi router
• Multi-Device Support - Unlimited number of synchronized nodes
• Low Latency - Direct peer-to-peer communication
• Reliable - No internet connection required
• Scalable - Easy to add more light nodes

System Architecture

Part of a complete lighting control system:

iOS App → ESP32 BLE Hub → ESP8266 Mesh Network
                              ↓ ESP-NOW ↓
                          [ESP8266] [ESP8266] [ESP8266]
                             (Synchronized <1ms)

Related Projects

• Lights_ios - iOS control app
• Lights_ESP32 - ESP32 BLE hub coordinator

Hardware Requirements

• ESP8266 Development Boards (NodeMCU, Wemos D1 Mini, etc.)
• LED strips (WS2812B or similar addressable LEDs)
• Power supply (5V for LEDs and ESP8266)
• Optional: Level shifter for LED data signal

Installation

Prerequisites

• PlatformIO or Arduino IDE
• USB cable for programming
• Multiple ESP8266 boards for mesh

Build and Upload

1. Clone the repository:

git clone https://github.com/kochcodes/ESP8266MultiDeviceSyncLight.git
cd ESP8266MultiDeviceSyncLight

2. Build and upload to each ESP8266:

pio run -t upload

3. Repeat for all ESP8266 nodes in your mesh

Configuration

platformio.ini

Configure your ESP8266 board:

[env:d1_mini]
platform = espressif8266
board = d1_mini
framework = arduino

Mesh Setup

1. Flash firmware to all ESP8266 devices
2. Power on all devices - they auto-discover via ESP-NOW
3. Mesh network forms automatically
4. Synchronization begins immediately

How It Works

ESP-NOW Protocol

• Uses ESP-NOW for direct device-to-device communication
• No WiFi router required
• Sub-millisecond latency
• Broadcasts commands to all mesh nodes simultaneously

Synchronization

All devices receive commands at nearly the same instant, ensuring:

• Perfectly timed animations
• Coordinated color changes
• Synchronized effects across all lights

Usage

Standalone Mode

The system can run independently or be controlled by the ESP32 BLE hub which receives commands from the iOS app.

Animation Modes

Supports various synchronized effects:

• Solid colors
• Fading
• Rainbow
• Custom animations

Development

Project Structure

ESP8266MultiDeviceSyncLight/
├── src/              # Source code
│   └── main.cpp      # Main application
├── platformio.ini    # PlatformIO configuration
└── Makefile          # Build automation

Troubleshooting

Devices Not Syncing

• Ensure all devices are on the same WiFi channel
• Check ESP-NOW initialization succeeded
• Verify MAC addresses are correctly configured

Timing Issues

• Minimize code in interrupt handlers
• Use hardware timers where possible
• Reduce WiFi activity during critical timing

Technical Details

• Synchronization Accuracy: <1ms between nodes
• Maximum Nodes: Limited by ESP-NOW (20 paired devices)
• Range: ~100m line of sight
• Protocol: ESP-NOW (802.11 based)

License

Open source - check repository for license details.

Tags

esp8266 esp-now mesh-network led lighting synchronized iot home-automation platformio wireless