Node-RED: Rozdiel medzi revíziami
Zo stránky SensorWiki
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== '''Príklad 2''' == | == '''Príklad 2''' == | ||
[[Súbor:Node-RED-Example02.png]] | [[Súbor:Node-RED-Example02.png|600px]] | ||
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== '''Príklad 3''' == | == '''Príklad 3''' == | ||
Verzia z 17:22, 12. máj 2020
Quick Start
- Inštalácia: https://nodered.org/docs/getting-started/windows
- Online Node-RED environment FRED: https://fred.sensetecnic.com/
- START http://localhost:1880/
- Start Dashboard http://localhost:1880/ui
- Základy
- Node-RED Guide http://noderedguide.com
- Cookbook: https://cookbook.nodered.org/basic/map-between-different-number-ranges
- Knižnice: obvykle radia cez npm (node package manager), ale mne to velmi neslo, preto odporucam postup priamo z Node-RED menu: Settings -> Palette -> Install
- Ukladanie: vytvorené flows sa nikam extra neukladajú, ale ak by to náhodou spadlo, prídete o ne. Preto odporúčam cez Menu -> Export uložiť to čo potrebujete
- Koniec: Ctrl+C
Čo ďalej? Podrobnejšie informácie:
- Node-RED Guide: http://noderedguide.com
- Toto je dolezite pochopit https://nodered.org/docs/user-guide/messages#understanding-the-structure-of-a-message
- Inak vysvetlené messages http://www.steves-internet-guide.com/node-red-message-object/
- A hodi sa asi aj vysvetlenie ako je to s premennymi http://www.steves-internet-guide.com/node-red-variables/
- Dashboard podrobnejšie http://noderedguide.com/lecture-7-node-red-dashboard-part2/
- Komunikácia s IBM Watson https://developer.ibm.com/recipes/tutorials/connecting-raspberry-pi-gateway-watson-iot-using-node-red-part-ii/
Inštalácia
1. Najprv nainštalujeme odtialto Node.js
https://nodejs.org/en/
Čo je node js? Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside of a web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting—running scripts server-side to produce dynamic web page content before the page is sent to the user's web browser. Consequently, Node.js represents a "JavaScript everywhere" paradigm,[6] unifying web-application development around a single programming language, rather than different languages for server- and client-side scripts.
Inštaláciu skontrolujeme
C:\>node --version && npm --version
U mňa bola odozva takáto
v12.14.1 6.13.4
funguje to až keď po inštalácii zavrieme vsetky cmd okna a potom v novootvorenom cmd uz to funguje.
2. Potom nainštalujeme z cmd konzoly Node-RED, pre linuxy je
popis na stranke, pre win je trocha zmena:
Spsutit cmd (ale run as administrator)
C:\>npm install -g --unsafe-perm node-red
(mne to skoncilo takto
node-pre-gyp WARN Using request for node-pre-gyp https download
ale nevadilo to)
3. Po instalacii to uz funguje, takze staci spustit z cmd
C:>node-red
Musi to bezat v cmd okne na pozadi stale.
4. A potom, tak ako je to aj v tom cmd okne napisane:
Server now running at http://127.0.0.1:1880/ alebo http://localhost:1880
Viac info tu: https://nodered.org/docs/getting-started/windows
First flow
https://nodered.org/docs/tutorials/first-flow
5. Ukoncenie:
It can then be stopped by pressing Ctrl-C or by closing the terminal window. Alebo na unixovych strojoch cez KILL a PID
Po inštalácii Node-RED budete mať k dispozícii iba základnú sadu uzlov. Dodatočné uzly je možné inštalovať priamo z editora, ale je to trochu skryté. Musíte kliknúť na ikonu menu v pravej hornej časti obrazovky a v menu vybrať funkciu Manage palette. Vyberiete si záložku Palette/Install. Do vyhľadávania napíšte nasledovné výrazy a nainštalujte si ich.
node-red-node-serialport node-red-dashboard
Poznámka: nepotrebujeme ziadnu Arduino specific kniznicu, lebo ideme komunikovat cez seriovy port, co je ovela univerzalnejsie ako Arduino.
Príklad 1
Najjednoduchší základný príklad
[
{
"id": "cc236d6c.fe202",
"type": "inject",
"z": "176a8127.e35c5f",
"name": "",
"topic": "",
"payload": "{\"Temperature\":27}",
"payloadType": "str",
"repeat": "",
"crontab": "",
"once": false,
"onceDelay": 0.1,
"x": 150,
"y": 200,
"wires": [
[
"be082013.640bb"
]
]
},
{
"id": "92282460.c4e178",
"type": "debug",
"z": "176a8127.e35c5f",
"name": "",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload",
"targetType": "msg",
"x": 810,
"y": 200,
"wires": []
},
{
"id": "be082013.640bb",
"type": "json",
"z": "176a8127.e35c5f",
"name": "",
"property": "payload",
"action": "",
"pretty": false,
"x": 370,
"y": 200,
"wires": [
[
"3a67409b.6b098"
]
]
},
{
"id": "3a67409b.6b098",
"type": "function",
"z": "176a8127.e35c5f",
"name": "Temperature",
"func": "/* extrahujeme len jednu z hodnot */\nmsg.payload = msg.payload.Temperature;\nreturn msg;",
"outputs": 1,
"noerr": 0,
"x": 570,
"y": 200,
"wires": [
[
"92282460.c4e178"
]
]
}
]
Príklad 2
[
{
"id": "5855d622.ab8758",
"type": "tab",
"label": "Flow 1",
"disabled": false,
"info": ""
},
{
"id": "dd03e979.ca34a8",
"type": "serial in",
"z": "5855d622.ab8758",
"name": "",
"serial": "f73cdcfa.3b1a",
"x": 210,
"y": 140,
"wires": [
[
"82b6fb5f.243848"
]
]
},
{
"id": "37b2b2a.4c2ab4e",
"type": "ui_gauge",
"z": "5855d622.ab8758",
"name": "Temp",
"group": "8b2bccd7.70966",
"order": 1,
"width": "6",
"height": "5",
"gtype": "gage",
"title": "Teplota",
"label": "v tieni",
"format": "{{value}} °C",
"min": "-10",
"max": "40",
"colors": [
"#18ebf5",
"#258141",
"#ca3838"
],
"seg1": "10",
"seg2": "28",
"x": 830,
"y": 80,
"wires": []
},
{
"id": "eb1afe0.5b288",
"type": "debug",
"z": "5855d622.ab8758",
"name": "",
"active": false,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "false",
"x": 810,
"y": 140,
"wires": []
},
{
"id": "d8a28ce2.04c82",
"type": "inject",
"z": "5855d622.ab8758",
"name": "",
"topic": "",
"payload": "{\"Temperature\":27}",
"payloadType": "str",
"repeat": "",
"crontab": "",
"once": false,
"onceDelay": 0.1,
"x": 190,
"y": 80,
"wires": [
[
"82b6fb5f.243848"
]
]
},
{
"id": "82b6fb5f.243848",
"type": "json",
"z": "5855d622.ab8758",
"name": "",
"property": "payload",
"action": "",
"pretty": false,
"x": 410,
"y": 80,
"wires": [
[
"3f55b492.096fcc"
]
]
},
{
"id": "3f55b492.096fcc",
"type": "function",
"z": "5855d622.ab8758",
"name": "Temperature",
"func": "/* extrahujeme len jednu z hodnot */\nmsg.payload = msg.payload.Temperature;\nreturn msg;",
"outputs": 1,
"noerr": 0,
"x": 610,
"y": 80,
"wires": [
[
"eb1afe0.5b288",
"37b2b2a.4c2ab4e"
]
]
},
{
"id": "f73cdcfa.3b1a",
"type": "serial-port",
"z": "",
"serialport": "COM12",
"serialbaud": "9600",
"databits": "8",
"parity": "none",
"stopbits": "1",
"waitfor": "",
"newline": "\\n",
"bin": "false",
"out": "char",
"addchar": "false",
"responsetimeout": ""
},
{
"id": "8b2bccd7.70966",
"type": "ui_group",
"z": "",
"name": "Aktuálny stav",
"tab": "37ac9c98.3fb884",
"order": 2,
"disp": true,
"width": "12",
"collapse": false
},
{
"id": "37ac9c98.3fb884",
"type": "ui_tab",
"z": "",
"name": "Station",
"icon": "dashboard",
"order": 1,
"disabled": false,
"hidden": false
}
]
Príklad 3
K niektorým blokom je samostatný stručný návod
- e-mail node
- mqtt node
- serial-in node
Celý komplexný príklad je k dispozícii na stiahnutie tu: Médiá:Node-RED-Example03.json
Kto by potreboval, tu je aj zdroják pre snímač teploty a vlhkosti DHT11 k Arduinu
Vo vyššie uvedených prikladoch sme použili okrem iného: