NODE-RED An event based toolkit for devices and robots

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1 NODE-RED An event based toolkit for devices and robots

2 WHAT IS NODE RED? An open source web application framework for node.js (Javascript) A web based IDE for connecting devices together A visual tool for interconnecting Nodes to create Flows which process Events. Donated to Open Source by IBM (Like Eclipse). It is platform agnostic. Has many hardware integrations for many common devices Public Node and Flow Library of existing examples Could be used to create an entire application by just dragging a dropping

INSTALLING NODE RED Install Node.js from https://nodejs.

3 INSTALLING NODE RED Install Node.js from Run this command from the command line sudo npm install -g --unsafe-perm node-red or on windows (as administrator) npm install -g --unsafe-perm node-red Now start it with this command node-red Open your browser to: This application can be secured by adding a username and password hash to the file ~/.node-red/settings.js Above is a sample node program used to create a websocket based bot for Slack Comes pre-install with the latest NOOBS for Raspberry PI

4 TERMS - WHAT ARE MESSAGES, NODES AND FLOWS? A Message or msg is a Javascript object representing information which will pass through a Flow. Its like a context that is passed to each node (Function) in the flow. Messages enter or are created by Input Nodes Messages exit or are delivered by Output Nodes They have one connection point Examples of Input and Output nodes types are http, websocket,tcp, mqtt, and serial Function Nodes represent Javascript functions which can manipulate the Message Object and then pass it to the next node in the Flow. They have and input and an output connection point. Flows are a series of interconnected Nodes each starting with an Input Node and Ending with an Output Node. Flows are exportable as JSON objects.

5 VISUALIZING A FLOW

6 THE NODE RED WEB IDE Node Pallet (along the left side) Sheet 1 is a new Flow The Info Tab delivers help on the selected node The Debug tab receives information sent to the Debug output node. Demonstrate Hello World Flow As a web page Flows must be Deployed (saved) before they can be used.

7 CONTROLLING DEVICES ON A RASPBERRY PI - THE BUSY BOX npm install node-red-contrib-gpio (Needed for gpio nodes) Johnny Five Project - Comes with the above One Servo on BCM 18 wpi 1 One LED on BCM 4 wpi 7 One Pull Up Switch on BCM 7 wpi 11

8 THE BUSY BOX FLOW

9 SOURCE FOR BUSY BOX FLOW [{"id":"8c631de8.0ac0c","type":"nodebot","z":" d91cd8","name":"local PI","username":"","password":"","boardType":"raspiio","serialportName":"","connectionType":"local","mqttServer":"","socketServer":"","pubTopic":"","subTopic":"","tcpHost":"","tcpPort":"","sparkId":"","spark Token":"","beanId":"","impId":"","meshbluServer":" out","z":" d91cd8","name":"servo","state":"servo","pin":"1","i2cdelay":"0","i2caddress":"","i2cregister":"","outputs": 0,"board":"8c631de8.0ac0c","x":696,"y":216,"wires":[]},{"id":"702c791a.cb1a48","type":"inject","z":" d91cd8","name":"Servo to 0","topic":"","payload":"0","payloadType":"num","repeat":"","crontab":"","once":false,"x":195,"y":202,"wires":[[" "]]}, {"id":"f4dbedcf.bc318","type":"inject","z":" d91cd8","name":"servo to 180","topic":"","payload":"180","payloadType":"num","repeat":"","crontab":"","once":false,"x":203,"y":253,"wires":[[" "]]},{"id":"d9a1429e. 5447a","type":"gpio out","z":" d91cd8","name":"led","state":"output","pin":"7","i2cdelay":"0","i2caddress":"","i2cregister":"","outputs": 0,"board":"8c631de8.0ac0c","x":550,"y":362,"wires":[]}, {"id":"3de05913.a55c86","type":"inject","z":" d91cd8","name":"","topic":"","payload":"1","payloadtype":"num","repeat":"","crontab":"","once":fals e,"x":184,"y":369,"wires":[["d9a1429e.5447a"]]}, {"id":"cd77e59b.d5fa58","type":"inject","z":" d91cd8","name":"","topic":"","payload":"0","payloadtype":"num","repeat":"","crontab":"","once":false,"x":193,"y":440,"wires":[["d9a1429e.5447a"]]},{"id":"86258cbd.100e","type":"gpio in","z":" d91cd8","name":"button 1","state":"INPUT","samplingInterval":"300","pin":"11","board":"8c631de8.0ac0c","x":172,"y":533,"wires":[["25cb1c5c.0931f4"]]}, {"id":"17cb da","type":"gpio in","z":" d91cd8","name":"button 2","state":"INPUT","samplingInterval":"300","pin":"4","board":"8c631de8.0ac0c","x":173,"y":606,"wires":[[]]}, {"id":"320e68f ","type":"function","z":" d91cd8","name":"send 60","func":"msg.payload = 60;\nreturn msg;","outputs":1,"noerr":0,"x": 580,"y":530,"wires":[[" "]]}, {"id":"730ad3b3.ff17ac","type":"debug","z":" d91cd8","name":"","active":true,"console":"false","complete":"true","x":558,"y":614,"wires":[]}, {"id":"25cb1c5c.0931f4","type":"switch","z":" d91cd8","name":"","property":"payload","propertytype":"msg","rules": [{"t":"eq","v":"0","vt":"num"}],"checkall":"true","outputs":1,"x":380,"y":525,"wires":[["320e68f ","730ad3b3.ff17ac"]]}]

10 USING FIRMATA TO CONTROL AN ARDUINO FROM A PI Firmata is a serial communication protocol based on MIDI Sketch comes standard in the Arduino IDE two way communication, looks just like its local Servos, SPI and I2C are also supported

11 QUESTIONS? What do you think?

Using Node-RED to build the internet of things

IBM Bluemix Using Node-RED to build the internet of things Ever had one of those days Where the Application works! And then Can we also get some data from the this whatchamacallit? And send the logs off