An Introduction To IoT (Internet of Toilets 🚽); Or How I Built an IoT Kitty Litter Box Using JavaScript - 20 Mins

My favorite things in life are cats 🐈, computers 🖥 and crappy ideas 💩, so I decided to combine all three and make an IoT (Internet of Things) litter box using a Raspberry Pi and JavaScript! If you have ever wanted to get build your own IoT project, but didn’t know how to start, then this is the talk for you.

Together, we will go through how I setup my IoT Litter Box from start to finish. Including how to setup Node.js on a Raspberry Pi and how to connect sensors to a Raspberry Pi and how to read the sensor inputs with Node.js.

Transcript

1. @JoeKarlsson1 IoT and JS(?!) A Gentle Introduction to the Internet of Things @JoeKarlsson1
2. { name: “Joe Karlsson”, company: “MongoDB”, title: [ “Developer Advocate”, “Software Engineer” ], } twitter: “@JoeKarlsson1”, twitch: “joe_karlsson”, tiktok: “joekarlsson”, website: “joekarlsson.com”, opinions: “my own”, links: “bit.ly/IoTKittyBox”
3. @JoeKarlsson1 Agenda • Intro to IoT • Why JS & IoT? • IoT Kitty Litter Box • The future of IoT @JoeKarlsson1
4. @JoeKarlsson1 What the heck is IoT? @JoeKarlsson1
5. @JoeKarlsson1 It’s just the internet, but with “things” on it @JoeKarlsson1
6. @JoeKarlsson1
8. @JoeKarlsson1 Agenda • Intro to IoT • Why JS & IoT? • IoT Kitty Litter Box • The future of IoT @JoeKarlsson1
9. @JoeKarlsson1 IoT + JS(?!) @JoeKarlsson1
10. @JoeKarlsson1 Why Node? 58 percent of respondents that identified as IoT developers use Node Source: https:/ /nodejs.org/en/blog/announcements/nodejs-foundation-survey/ @JoeKarlsson1
11. @JoeKarlsson1 JS is a great choice for new devs Other low level programming languages can be difficult to develop @JoeKarlsson1
12. @JoeKarlsson1 Easy to update over a network @JoeKarlsson1
13. @JoeKarlsson1 The internet already speaks JS @JoeKarlsson1
14. @JoeKarlsson1 Tons of existing libraries, plugins and APIs @JoeKarlsson1
15. @JoeKarlsson1 Cylon.js Johnny-Five https://cylonjs.com/ http://johnny-five.io/ @JoeKarlsson1
16. @JoeKarlsson1 JS is great at handling event-driven apps @JoeKarlsson1
17. @JoeKarlsson1 Agenda • Intro to IoT • Why JS & IoT? • IoT Kitty Litter Box • The future of IoT @JoeKarlsson1
18. @JoeKarlsson1 Let’s jump into something *practical @JoeKarlsson1
19. @JoeKarlsson1 @JoeKarlsson1 IoT Kitty Litter Box
20. @JoeKarlsson1 @JoeKarlsson1
21. @JoeKarlsson1 @JoeKarlsson1
22. @JoeKarlsson1 @JoeKarlsson1 Maintenance Mode
23. @JoeKarlsson1 @JoeKarlsson1 Initialize Base Weight
24. @JoeKarlsson1 @JoeKarlsson1
25. @JoeKarlsson1 @JoeKarlsson1 Cat Detected
26. @JoeKarlsson1 @JoeKarlsson1
27. @JoeKarlsson1 @JoeKarlsson1 Reset new base weight
28. @JoeKarlsson1 @JoeKarlsson1 Wait for new event
29. @JoeKarlsson1 @JoeKarlsson1 Code: http:/ /bit.ly/IotKittyBox
30. @JoeKarlsson1 @JoeKarlsson1 The first step of any IoT project is to make an LED blink
31. @JoeKarlsson1 var five = require("johnny-five"); var Raspi = require("raspi-io").RaspiIO; var board = new five.Board({ io: new Raspi() }); board.on("ready", function() { var led = new five.Led("P1-13"); led.blink(); });
32. @JoeKarlsson1 Alright, let’s make a toilet @JoeKarlsson1
33. @JoeKarlsson1 const { RaspiIO } = require('raspi-io'); const five = require(‘johnny-five'); const board = new five.Board({ io: new RaspiIO(), }); let state = { isMaintenenceMode: false, }; board.on('ready', () => { const spdt = new five.Switch('GPIO16'); spdt.on('open', () => { state.isMaintenenceMode = true; }); spdt.on('close', () => { state.isMaintenenceMode = false; }); });
34. @JoeKarlsson1 @JoeKarlsson1
35. @JoeKarlsson1 The load cells… @JoeKarlsson1
36. @JoeKarlsson1 const spawn = require('child_process').spawn; const process = spawn('python', ['./hx711py/scale.py'], { detached: true }); // Takes stdout data from script which executed // with arguments and send this data to res object process.stdout.on('data', data => { let currWeight = parseFloat(data); let avgWeight = updateAverageWeight(currWeight, recentsWeights); }); process.stderr.on('data', err => { console.error(err); }); process.on('close', (code) => { console.log(`child process exited with code ${code}`); });
37. @JoeKarlsson1 @JoeKarlsson1
38. @JoeKarlsson1 IoT Time Series Schema @JoeKarlsson1 Want $200 in free credits? http:/ /bit.ly/NodeJSInteractive
39. { "_id": { "$oid": "dskfjlk2j92121293901233" }, "timestamp_day": { "$date": { "$numberLong": "1573854434214" } }, "type": "cat_in_box", "cat": { "name": "BMO", "weight": "200" }, "owner": "Joe Karlsson", "events": [ ] } IoT Time Series Schema { "timestamp_event": { "$date": { "$numberLong": "1573854435016" } }, "weight": { "$numberDouble": “15.593333333" } }, { "timestamp_event": { "$date": { "$numberLong": "1573854435824" } }, "weight": { "$numberDouble": "15.132222222" } }, { "timestamp_event": { "$date": { "$numberLong": "1573854436632" } }, “type”: “maintenance” } @JoeKarlsson1
40. @JoeKarlsson1 @JoeKarlsson1 Box Assembly
41. @JoeKarlsson1 @JoeKarlsson1
42. @JoeKarlsson1 Agenda • Intro to IoT • Why JS & IoT? • IoT Kitty Litter Box • The future of IoT @JoeKarlsson1
43. @JoeKarlsson1 Smaller and more powerful devices \ Better Hardware support JS with a smaller footprint Batteries will become the bottleneck The Future of JS + IoT? @JoeKarlsson1
44. @JoeKarlsson1 Do you want to be an IoT and JS master? @JoeKarlsson1
45. @JoeKarlsson1 Just do it! @JoeKarlsson1
46. @JoeKarlsson1 Thank You! @JoeKarlsson1
47. @JoeKarlsson1 All resources and links used in this talk can be found here: @JoeKarlsson1 bit.ly/IoTandJS
48. { name: “Joe Karlsson”, company: “MongoDB”, title: [ “Developer Advocate”, “Software Engineer” ], twitter: “@JoeKarlsson1”, twitch: “joe_karlsson”, website: “joekarlsson.com”, links: “bit.ly/IoTKittyBox” }
49. @JoeKarlsson1 •Source Code - http://bit.ly/IotKittyBox • IoT Reference Architecture - https:// www.mongodb.com/collateral/iot-reference- architecture •Time Series Data and MongoDB: Best Practices Guide - https://www.mongodb.com/ collateral/time-series-best-practices Additional Resources
50. @JoeKarlsson1