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IoT project
About project
I developed an application to measure temperature, humidity, water level. It's for flood detection in home cases - controller should be placed under the sink, near washing machine or dishwasher. A project consists 4 parts - an arduino app, a backend for handling data from mqtt and the mobile application to present actual metrics and events with alarming data. I describe every part as briefly as I can.
An arduino part
I used IoT controller just like this in a link.
I used two sensors with this iot controller:
- DHT11 - it read temperature, humidity and heat index.
- Iduino SE045 - read liquid level
Controller has a Wi-Fi module to make simple the TCP/IP connections, in my case it was a popular message broker MQTT mosquitto on a docker eclipse-mosquitto. Every 5 seconds I read data from sensors and publish to mqtt broker. All arduino code you have it here
Backend
It's a bridge between mqtt broker data and a mobile application. Repository is here. I subscribed to mqtt topic /water_leak/detection and I analyzed data from mqtt package in a backend application. I think it's worth to mention about mechanism for detection missing package. By detection missing packages I mean checking time from last one occurred data (if one minute elasped I raise an event noDataReceivedEvent). Of course backend has logging and events and data are stored in a files, so if application restart I retrieve current day events and data. You can retrieve events from rest endpoint, but last value data are emitted to websockets.
Mobile application
I decided to create a mobile application in Flutter, in a Dart language. Probably you say: why not create an app in React Native, because you know a React and should not be any problem to do it faster. I just save you have right to think like that. But I'm a developer who love to learn a new things and a flutter is not complicated like you think. It's a great documentation and for me is easy to use, popular, with nice syntax :) The best thing is how easy you create a components / widgets in a flutter. Check out the repository to see how application looks like. In my app I use a IOWebsocketChannel for websockets and default http dart package to make rest calls. In the app I focused on ios so code has specific components for ios. Of course in Flutter, just like in React Native you have some components only for ios and android, but is a lot of common components. I'm not realized that someone can use my application, so I debug an app on IOS. But maybe sometimes I change it to android too ;)
