What is Node-Red? · ESP8266s can “subscribe” to multiple topics (I use only two –one for specific boards –and one for individual boards) The incoming message can then be

What is Node-Red?(and why do we care?)

• A visual IOT tool for wiring together hardware devices, APIs and services

• Runs on Node.js

• Works closely with MQTT

• Free

http://tech.Scargill.net

• A visual IOT tool for wiring together hardware devices, APIs and services

• Runs on Node.js

• Free

• Consists of modules visually wired together

• Many library nodes available – or write your own


Install Node-Red on:

• A linux PC or VM (Digital Ocean)• A Windows PC• Some NAS drives• A Raspberry Pi or Pi2• etc




Typical nodes available in Node-Red

“grove”, “scheduler” and “duskdawn” created by Peter Scargill.


Typical starting point.

Visual screen ONLYRequired while editing.

Node-Red continues to run without visual editor.


Simple Example…


Drag and dropTimestamp and debug nodes to working area


Double-click Inject node and make a 5 second timestamp


Join together

Deploy

Voila


MQTT Example

Here a timestamp is sent to topic “thetime”

Separately, we are “subscribed” to “thetime” –and the result appears in the debug window


My own (unfinished)setup

Multiple pages Database reading and writing

Web sockets

All on a Raspberry Pi 2

or Digital Ocean “Droplet”


Node-red sends temperature/humidity values to GroveStreams


OR

Send temperature etc to local MYSQL

Then use, say PHP+Highchartslocally – for local only display


Back to our simpleMQTT demo – topic is “thetime”

Monitor with MQTT-SPY by Kamil Baczowicz

http://tech.Scargill.nethttps://github.com/kamilfb/mqtt-spy/releases/tag/mqtt-spy_v0.2.0

Practicalities

We have a SCRIPT at tech.scargill.net to make setup easy. Can install MQTT + NODE-RED + MYSQL + PHP and lots more

Raspberry Pi (2) - great – but – will SD memory last years of writing?

Alternatively – a dedicated PC with Linux? Expensive to run?

Alternatively – a Digital Ocean Droplet $5 a month? (or free – see the blog)


ESP8266s can “subscribe” to multiple topics (I use only two – one for specific boards – and one for individual boards)

The incoming message can then be processed in any way you wish – in C or other language… on boards using “unofficial dev Kit” or ESP-Arduino – or LUA? then send out a reply MQTT message – or just DO something.

Discussion – practical – fun.

If you want to follow up at home – source, code, ideas, boards, discussion on the blog

This presentation – links and much more all on the blog…

http://tech.scargill.net/home-control-2015/

Documents

What is Node-Red? · ESP8266s can “subscribe” to multiple topics (I use only two –one for specific boards –and one for individual boards) The incoming message can then be