NeoPixel

This library enables the Adafruit NeoPixel control from a Node.js script through a TCP connection.

The server side has to be installed on an ESP8266/Arduino (or compatible) board.
The client side can work on any machine that runs Node.js.

Requirements

• ESP8266 or compatible board, available here https://amzn.to/2Vpm3C8#esp8266
• A NeoPixel strip led, available here https://amzn.to/2AuuZNQ#neopixel-strip-led
• A power supply that supports 5V and 18watt (depends on number of pixels), available here https://amzn.to/2SFMTo1#power-supply-5v-18w
• A jack for DC connections, available here https://amzn.to/2RaNGQT#jack-dc

Setup

• Upload the firmware on the ESP8266.
  Upload the file firmware/neopixel/neopixel.ino into your ESP8266.
  To do this you can use the Board Manager available in the Arduino software.
  Follow this instructions https://arduino-esp8266.readthedocs.io/en/latest/installing.html

• Wire the strip with the ESP8266.
  Connect the Strip Led and the ESP8266 to a power supply and the DATAIN pin with the D1 pin.
  More details are available here https://learn.adafruit.com/adafruit-neopixel-uberguide/basic-connections

• Connect your ESP8266 on your local network.
  Turn on your ESP8266. You should see an Access Point that has neopixel as SSID name.
  Connect on it, then you should see a captive portal that asks your Wi-Fi credentials.
  Provide it and then try to ping on your local network neopixel.local. You should be able to see this device connected and announced through Bonjour.
  More details about the Wi-Fi configuration are available here https://github.com/tzapu/WiFiManager#how-it-works.
  More details about the service discovery are available here https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266mDNS#requirements.

Example

const NeoPixel = require('neopixel');

const SERVER = process.env['SERVER'] || 'tcp://neopixel.local:800'
const PAUSE = parseInt(process.env['PAUSE']) || 1000

const neopixel = new NeoPixel()

;(async () => {
  try {
    let { pixels } = await neopixel.connect(SERVER)
    console.log('PIXELS ' + pixels)

    let pixel = 0
    while (1) {
      pixel = ++pixel % neopixel.pixels
      const { latency } = await neopixel.setPixels([{ pixel, r: 255, g: 0, b: 0 }], true)
      console.info(`latency=${latency}ms`)
      await NeoPixel.wait(PAUSE - latency)
    }
  } catch (e) {
    console.error(`Error occurred: [${e.code}] ${e.message}`)
    process.exit(1)
  }
})()

Reference

new NeoPixel()

const NeoPixel = require('neopixel')
const neopixel = new NeoPixel()

connect(tcpUri)

Connects client with the board and returns number of configured pixels.

const {latency, pixels} = await neopixel.connect('tcp://neopixel.local:800')

setPixels(arrayOfColors, reset=false)

Sets pixel colors. If reset, any other pixel is turned off.

const {latency} = await neopixel.setPixels([
    {pixel: 10, red: 255, green: 0, blue: 0},
    {pixel: 20, red: 0, green: 255, blue: 0},
], true)

// shorthand version
const {latency} = await neopixel.setPixels([
    {p: 10, r: 255, g: 0, b: 0},
    {p: 20, r: 0, g: 255, b: 0},
], true)

fill(color)

Sets every pixel with the same color.

const {latency} = await neopixel.fill({red: 255, green: 0, blue: 0})

// shorthand version
const {latency} = await neopixel.fill({r: 255, g: 0, b: 0})

off()

Turn of every pixel.

const {latency} = await neopixel.off()

Changelog

• 0.x - Beta version
• 1.0 - First official version
• 1.1 - Migrates to gh-workflows; Upgrades deps; Deprecated Node 8

Contributors

• chrvadala (author)