Full Stack Meat Project with Arduino Node AWS Mobile
- 1. Full Stack Meat Project ‘GrillLog’ Kevin Kazmierczak
- 2. What are we talking about? Creating a custom built dual probe BBQ thermometer instead of buying one
- 3. Motivation ● Learn Arduino and basic electronics ● Be able to see grill temperatures on my devices ● Get notified when it was ready ● Learn AWS ● I thought it’d be similar in cost...
- 4. About Me ● http://www.kevinkaz.com ● @kazmiekr ● Solutions Architect for Universal Mind ● Two Alexa skills published ○ TechBuzz - MBTA Alerts ● 4 Apple Apps - Download them! Taptronome FuelMate Battle Pet Galaxy MadBombz
- 5. Demo
- 8. Version 1 ● Built using Parse :( ● Wifi using ESP8266 ● Old blog article
- 9. Overview ● Arduino ● AWS IoT ● Lambda ● DynamoDB ● API Gateway ● SNS ● Alexa ● iOS ● Web ● Android
- 10. Warning I am not an expert in any of this. Please feel free to add additional context or information as needed.
- 12. Arduino Basics ● 14 Digital I/O Pins ( 6 PWM ) ● 6 Analog ● 5V ● Embedded code written in C/C++ as a ‘Sketch’
- 13. Arduino Yun ● Device details ○ Built in wifi ○ Two processors, traditional ATmega and AR9331 (Linux) ○ Linux processor handles all the more CPU intensive tasks ( wifi / data processing ) ○ ATmega handles reading/writing outputs ● How does it compare to others? ● Could you replace this with a RPi?
- 14. Fritzing Circuit Diagram Learn more about Fritzing
- 15. GrillLog Implementation ● Every 10 seconds the device reads two analog inputs ● Using a Steinhart–Hart equation, it converts the analog resistance to temperature ● Equation coefficients calibrated by taking 3 different temperatures and plugged into an online calculator ● Current readings are dumped to Serial and the LCD display
- 17. AWS Fine Print ● Sign up for a free tier trial account ● One year of free tier account services ● Some of the core services have very generous free limits even without a trial account ● Pay for what you use ● Security ○ Ensure that there are roles setup that have access to execute the pieces of the different services
- 18. AWS IoT ● Allows device to communicate over MQTT with encrypted traffic ● MQTT - Lightweight messaging protocol, think JMS or Pub/Sub ● Each device gets a signed certificate to use with messaging ● Devices can have shadows for offline sync ● Compatible devices - Anything that can do secure MQTT ● Use command line mosquitto to simulate device messaging
- 19. AWS IoT
- 20. AWS IoT Rules ● Rules can filter messages into different channels ● SQL query like syntax to set them up ● Use built in actions ● Lambda is most flexible action
- 21. GrillLog Implementation ● Yun has certificates installed ● Yun constructs JSON document of temps ● Yun posts message on ‘templogs’ topic ● AWS has a rule that all incoming ‘templog’ messages are forwarded to a lambda function ● Tweaked AWS config to solve memory issues
- 22. AWS Lambda ● Runs code in response to events ● Pay for what you consume ● Develop in Javascript/Java/Python ● No servers to manage or scale ● Core service used to integrate across AWS ● Pricing ○ First 1 million requests per month are free ○ $0.20 per 1 million requests thereafter ($0.0000002 per request)
- 23. Lamba Basics ● Can start from one of their many templates ○ Language specific ○ Voice templates ○ Microservices ○ Hello world ● Export a ‘handler’ that takes and event, context, callback ● Do whatever exports.handler = function(event, context, callback) { console.log("value1 = " + event.key1); console.log("value2 = " + event.key2); callback(null, "some success message"); // or // callback("some error type"); }
- 24. GrillLog Implementation ● Three lambda functions ○ Handle incoming IoT messages ○ Handle web requests ○ Handle voice requests ● All three lambdas just forward into a custom controller/service layer written in Node.js
- 25. Custom Service Layer ● AWS supports Node 4.3 (finally!!!) ○ ES2016 (ES6) features ■ Promises/arrow functions/etc - check for support before using ● Controller processes input and utilizes services needed ○ Could swap out service implementations later if needed ● Promise based - AWS sdk methods can return a promise ● Easy to test via command line locally ● Use any packages you need via npm ● Service layer gets packaged with lambda
- 26. GrillLog Implementation ● Utilizes the aws-sdk package ● Deployed via shell script ○ Creates a zip file of required files ○ Calls AWS specific CLI tooling ○ Cleans up ● Uploads a zip per each lambda endpoint
- 27. AWS DynamoDB ● NoSQL database similar to MongoDB ○ Schema-less ● Event driven hooks ● Easy to save data, not as easy to query ● Integration with other AWS services with streams/triggers ● Pricing ○ 25 GB in free tier, pay per usage ○ “For a little less than $0.25/day ($7.50/month), you could support an application that performs 1 million writes and reads per day”
- 28. DynamoDB Basics ● Each table has a primary key (hash key) - Most unique ● Optional sort key - What will I most likely sort on? ● Get data out via either a ‘scan’ or ‘query’ ○ ‘query’ requires primary key then you add filter criteria ● Indexes are required to speed up queries ● Sorting is tricky ● No date datatype, have to use a timestamp number ● Save whatever!
- 29. GrillLog Implementation ● Contains 3 tables ○ DeviceStatus ■ Current status information per device ○ TempLogs ■ Raw temp data from device ○ CookLogs ■ Archived cook data
- 30. AWS SNS - Simple Notification Service ● Pub-sub messaging ● Deliver across multiple protocols ○ iOS/Android ○ Email ○ SMS ● Hooks into other services ● Pricing ○ Your first 1 million push requests are free ○ $0.50 per 1 million Amazon SNS requests thereafter.
- 31. SNS Basics ● Create platform application ○ Need certificates to handle push integration with Apple/Google ● Devices can register to application with token ● Messages can be sent to the endpoints registered ● Raw or JSON ● Can tie multiple endpoints together via subscriptions ○ Topic could post to email and push together ● Push messages via AWS dashboard
- 32. GrillLog Implementation ● Devices are manually registered with device token on dashboard ● Application endpoint created with Apple push certificates from iTunes provisioning portal ● Custom services push JSON formatted messages for Apple devices
- 33. AWS API Gateway ● Deploy a customized API ● Define the resources that can be called ● SDK generation ● Authentication - keys, IAM, CORS ● Pricing ○ Free tier includes one million API calls per month for up to 12 months ○ $3.50 per million API calls received, plus the cost of data transfer out, in gigabytes.
- 34. API Gateway Basics ● You can create an API endpoint from the lambda ‘API endpoints’ tab ● Create resources as endpoints like ○ /status or /logs ● Add methods to those resources ○ GET/POST/PUT ● Point those endpoints to a lambda or proxy ● Configure the mappings - How will data pass through ● Customize as needed ● Create multiple ‘stages’ that you can deploy to
- 35. GrillLog Implementation ● Exposes REST endpoints ○ status/logs/startgrill/startcook/endgrill ● CORS enabled on status/logs for web ● Mobile clients handle state movement ● Entire request information is forwarded to a lambda ● Lambda determines what the URL should do and call proper controller method in custom services
- 36. Alexa Integration ● Registered skill on amazon developer site ● Forward to lambda or custom deployed services (HTTPS) ● Register intents ( voice input formats ) ● Deploy to app store - Requires approval ○ They are VERY strict that you follow the guidelines ○ You could get a free t-shirt ● Test on developer site ○ Lets you hear responses and see source JSON ● Detailed skill creation walkthrough
- 38. GrillLog Implementation ● Registered skill forwarding to lambda ● Simple ‘what’s the status’ intent ● Calls into custom services to grab current status ● Converts response into a text string passed back to voice services
- 39. Logging ● Configure services to write CloudWatch logs ● Add alerts if needed
- 40. iOS Application ● Apple developer account - $99 ○ Be able to deploy to devices and provision ● Configured app in iTunes connect ● Generate APNS certs imported to SNS ● Written in Swift ● Polls for temp status every 10 sec ● Regenerates chart every 30 sec ● Uses ‘Charts’ project for charting ● Sends push notifications ○ Warm temperature threshold ○ Food temperature ● Background fetch to detect offline situations
- 41. Web Application ● Deployed on http://grilllog.kevinkaz.com ● Written in ES2016 transpiled in webpack ● Uses D3 to handle charting ● Uses a fetch polyfill ● Styling done in Less
- 42. Android Application ● Written by coworker, Chris Scott ● Mortar and Flow for view lifecycles ● Dagger for dependency injection ● RxJava and Retrofit for service integration
- 43. Future Plans ● PID Controller for fan controlled temperature control ● Apple Watch Complication ● Waterproof case ● More notifications ● Review past cooks ● Archive condensed logs
- 44. Questions