WS2812B NeoPixel LED

Overview

WS2812B (NeoPixel) is an addressable RGB LED that can cascade multiple LEDs through a single data wire, with each LED independently controllable for color. Suitable for ambient lighting, status indication, LED strips, and other applications.

Supported Peripheral Types

Type	type Value	Description
NEO_PIXEL	45	WS2812B/WS2811 Addressable LED

Hardware Wiring

NeoPixel Pin	Connection	Description
VCC	5V	Power supply (~60mA per LED at full brightness)
GND	GND	Ground
DIN	GPIO	Data input (recommend 330Ω series resistor)

Configuration

Method 1: Web Interface Configuration (Recommended)

Before saving NeoPixel configuration, verify the data pin, LED count, color order, and independent power supply.

Step 1: Navigate to Peripheral Management Page

1. Open a browser and navigate to the ESP32 IP address
2. After logging in, click Peripheral Configuration in the left menu

Step 2: Add NeoPixel LED Strip Peripheral

1. Click the Add Peripheral button

2. Fill in the configuration:

   Field	Value	Description
   Peripheral ID	neopixel1	Unique identifier
   Name	RGB LED Strip	Display name
   Peripheral Type	NeoPixel LED (type: 45)	WS2812B driver
   Pin Configuration	16	DIN data pin
   LED Count	8	1-300 LEDs
   Global Brightness	50	0-255

3. Click Save

Step 3: Verify Configuration

1. Find the newly added peripheral in the peripheral list
2. Click the Enable toggle
3. Use the control panel to send color values (e.g., #FF0000 for red)

⚠️ Important: More than 10 LEDs require an independent 5V power supply; each LED draws ~60mA at full brightness

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Method 2: JSON Configuration File Import

Add the following configuration to the peripherals array in data/config/peripherals.json:

{
  "id": "neopixel1",
  "name": "RGB LED Strip",
  "type": 45,
  "enabled": false,
  "pins": [16],
  "params": {
    "count": 8,
    "brightness": 50
  }
}

Parameter Description

Parameter	Description	Range
count	Number of LEDs	1-300
brightness	Global brightness	0-255

Peripheral Execution Integration

NeoPixel is controlled via script actions (ACTION_SCRIPT = 15) or CALL_PERIPHERAL (10).

Web Interface Configuration Steps

Create RGB Running Light Effect

1. Click Peripheral Execution in the left menu
2. Click the Add Rule button
3. Configure a trigger (e.g., timer trigger, event trigger)
4. Add a script action:
   • Action Type: Command Script
   • Script Content:

   PERIPH neopixel1 COLOR #FF0000
   DELAY 500
   PERIPH neopixel1 COLOR #00FF00
   DELAY 500
   PERIPH neopixel1 COLOR #0000FF

5. Click Save

💡 Tip: Use PERIPH commands to control colors, DELAY to control timing

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JSON Configuration Example

Script Control Example

{
  "targetPeriphId": "",
  "actionType": 15,
  "actionValue": "PERIPH neopixel1 COLOR #FF0000\nDELAY 1000\nPERIPH neopixel1 COLOR #00FF00\nDELAY 1000\nPERIPH neopixel1 COLOR #0000FF",
  "useReceivedValue": false,
  "syncDelayMs": 0,
  "execMode": 0
}

Platform Downlink Control

Send color values via MQTT:

[{"id": "neopixel1", "value": "#FF5500"}]

Notes

1. Power Supply: Each LED draws up to 60mA at full brightness; 8 LEDs = 480mA; more than 10 LEDs require an independent power supply
2. Level Shifting: ESP32 GPIO is 3.3V, WS2812B requires 5V logic; short distances can use direct connection, long lines recommend level shifting
3. Series Resistor: Data line should have a 330Ω series resistor to protect GPIO
4. Capacitor Filtering: Connect a 100μF capacitor across the power supply to prevent voltage fluctuations
5. Maximum Count: Limited by memory and refresh time; recommend a maximum of 300 LEDs per strip