rpi_sense_hat_server/sensehat.js

const express = require('express')
const socketio = require('socket.io')
const CronJob = require('cron').CronJob
const request = require('request')
const sense = require('sense-hat-led').sync
const app = express()
const server = app.listen(3000, '0.0.0.0', () => console.log('server is running'))
const io = socketio(server)
app.use(express.static('public'))
sense.setRotation(180)
sense.lowLight = true

const color_red = [255, 0]
const color_blue = [0, 0, 255]
const leds = [
    [0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, 0, 0, 0, 0],
    [0, 0, 0, 0, 0, 0, 0, 0],
]
read_all_leds()

let zhao_server_errors = 0

const job = new CronJob(
    '*/5 * * * * *',
    async () => {
        // 测试 http://zhao 的连通性
        request('http://zhao', (err, res, body) => {
            if (res.statusCode != 200) {
                zhao_server_errors++
            }
            if (zhao_server_errors > 0) {
                for (let i = 0; i < zhao_server_errors; i++) {
                    const x = i % 8
                    const y = Math.floor(i / 8)
                    sense.setPixel(x, y, color_red)
                }
            } else {
                let color = sense.getPixel(0, 0)
                let r = color[0]
                let g = color[1]
                let b = color[2]
                sense.setPixel(0, 0, [r, g > 0 ? 0 : 255, b])
            }
        })
    },
    null,
    true
)

io.on('connection', (client) => {
    client.emit('leds', leds)
    client.on('action', ({ action, x, y }) => {
        console.log({ action, x, y })
        switch (action) {
            case 'on':
                sense.setPixel(Number(x), Number(y), color_blue)
                leds[y][x] = 1
                break
            case 'off':
                sense.setPixel(Number(x), Number(y), [0, 0, 0])
                leds[y][x] = 0
                break
            case 'hello':
                sense.flashMessage('HELLO', 1, color_blue)
                sense.clear()
                read_all_leds(0)
                break
            case 'flash':
                sense.clear([255, 255, 255])
                setTimeout(sense.clear, 100)
                read_all_leds(0)
                break
            case 'clear':
                sense.clear()
                read_all_leds(0)
                break
            case 'temp':
                read_all_leds()
                break
            default:
                break
        }
        io.emit('leds', leds)
    })
})

function read_all_leds(value = null) {
    const pixels = sense.getPixels()
    for (let y = 0; y < 8; y++) {
        for (let x = 0; x < 8; x++) {
            leds[y][x] = value !== null ? value : sense.getPixel(x, y)[2] == 0 ? 0 : 1
        }
    }
}