IoT Google Cloud Weather Station

Example of a weather station using Google Cloud IoT Core, Firebase Cloud Functions, Firestore and AndroidX

• firmware: Mongoose OS development for ESP8266
• functions: Firebase Cloud Functions
• android_app: Android companion app. Developed using Android Jetpack.

Hardware system

• DHT22: Temperature and Humidity sensor
• NodeMCU ESP8266
• Breadboard

Architecture

Mongoose OS

mos gcp-iot-setup --gcp-project YOUR_PROJECT_ID --gcp-region europe-west1 --gcp-registry iot-registry

mos put fs/init.js

load('api_config.js');
load('api_dht.js');
load('api_mqtt.js');
load('api_timer.js');
let topic = '/devices/' + Cfg.get('device.id') + '/state';
let dht = DHT.create(4, DHT.DHT22);
Timer.set(50000, true, function() {
  let msg = JSON.stringify({ temperature: dht.getTemp(), humidity: dht.getHumidity() });
  let ok = MQTT.pub(topic, msg, 1);
  print(ok, msg);
}, null);

Android App

Developed using:

• Firebase Cloud Firestore
• Kotlin Coroutines, Flow and StateFlow
• Dagger Hilt
• ViewModel
• Android KTX
• Material Design Components
• Jetpack Compose UI