---
disqus: ahb0222
GA : G-VF9ZT413CG
---
# Node-Red 搭配 LINE Notify 取得定時平均數據
> [color=#40f1ef][name=LHB阿好伯, 2021/07/16][:earth_africa:](https://www.facebook.com/LHB0222/)
###### tags: `Node-RED` `MQTT` `創客`

[TOC]

之前在[自製室內空品偵測器中提到](https://www.facebook.com/LHB0222/posts/1291948164658562)數據經常是每秒推一筆數據
若是想在Node-red dashboard上顯示歷史折線圖會等待非常非常久🤣
今天分享使用jsin的方式將數據收集求出每數分鐘平均後在畫圖
或是使用LINE Notify這樣也可以避免一堆通知
這樣可以大大提高dashboard畫圖的效率👍

# 安裝LINE Notify節點
https://flows.nodered.org/node/node-red-contrib-line-notify

安裝後應該就會看到下方的節點出現

## 取得LINE Notify 權杖(token)
https://notify-bot.line.me/


登入LINE帳號

選擇個人頁面


移至最底下取得權杖

這邊需要輸入通知機器人的名稱
選擇個人或是群組使用
若是有想要給別人使用就需要選擇群組
之後再將相關人員拉入群組即可

權杖==只會顯示一次==請另外紀錄好

之後手機應該會出現一個LINE Notify的通知


這一段通知非常重要
提醒要將她這個帳號加入通知的群組中
少了這一步就前功盡棄了XD

# 取得平均值



選擇輸出為陣列
選擇是累積一定數量或是定時的合併數據

創立一個簡單的JavaScript平均函數


最後就可以得到陣列的平均值了


修改函數也可以取得平均值到小數點後第一位的數值


## 推送平均值到Line

首先第一次使用需要先新增前面取得的權杖

一樣利用function節點我們可以增加一些說明文字



:::spoiler 完整流程

[
    {
        "id": "9a3bea13a76f1767",
        "type": "function",
        "z": "8b5074cef2b7979f",
        "name": "Temperature",
        "func": "msg.payload=(parseFloat(msg.payload.Temperature)/10);\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 810,
        "y": 140,
        "wires": [
            [
                "2d6d63814d984b1b"
            ]
        ]
    },
    {
        "id": "2d6d63814d984b1b",
        "type": "join",
        "z": "8b5074cef2b7979f",
        "name": "合併10秒數據",
        "mode": "custom",
        "build": "array",
        "property": "payload",
        "propertyType": "msg",
        "key": "topic",
        "joiner": "\\n",
        "joinerType": "str",
        "accumulate": false,
        "timeout": "10",
        "count": "",
        "reduceRight": false,
        "reduceExp": "",
        "reduceInit": "",
        "reduceInitType": "",
        "reduceFixup": "",
        "x": 1000,
        "y": 140,
        "wires": [
            [
                "56f40a891da3b3f8",
                "b89608fb8a9f22a9"
            ]
        ]
    },
    {
        "id": "56f40a891da3b3f8",
        "type": "function",
        "z": "8b5074cef2b7979f",
        "name": "",
        "func": "function average(nums) {\n    return nums.reduce((a, b) => a + b) / nums.length;\n}\nmsg.payload =  Math.round(average(msg.payload)*10)/10;\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 1200,
        "y": 140,
        "wires": [
            [
                "175ec2176192ab16",
                "000a88229e9d9577"
            ]
        ],
        "icon": "node-red-contrib-calc/calculator.png"
    },
    {
        "id": "175ec2176192ab16",
        "type": "debug",
        "z": "8b5074cef2b7979f",
        "name": "平均",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 1370,
        "y": 80,
        "wires": []
    },
    {
        "id": "db42e7c960aa994f",
        "type": "line-notify",
        "z": "8b5074cef2b7979f",
        "name": "",
        "message": "",
        "contentType": "message",
        "imageThumbnail": "",
        "imageUrl": "",
        "sticker": "default",
        "stickerPackageId": "1",
        "stickerId": "1",
        "silent": false,
        "creds": "",
        "x": 1480,
        "y": 140,
        "wires": [
            []
        ]
    },
    {
        "id": "000a88229e9d9577",
        "type": "function",
        "z": "8b5074cef2b7979f",
        "name": "註解",
        "func": "var message = \"溫度 : \" + msg.payload + \" 度\";\nmsg.payload = message;\n\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 1350,
        "y": 140,
        "wires": [
            [
                "db42e7c960aa994f"
            ]
        ]
    },
    {
        "id": "b89608fb8a9f22a9",
        "type": "debug",
        "z": "8b5074cef2b7979f",
        "name": "合併",
        "active": false,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 1160,
        "y": 100,
        "wires": []
    }
]

:::

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