IoT Wemos D1 MQTT

A basic system that can show and save real-time data such as temperature, humidity of a room. Also you have the ability to manage a device remotely and have the status of it.

Communication between the various devices is mainly through the use of the MQTT protocol.

Description

• Arduino ESP8266 (publish/subscribe) sends the temperature and humidity with the sensor DHT11 and switches an electrical device (e.g. fan)

• MQTT Broker manages all the publish and subcribe MQTT between connected devices

• Python MQTT ( subscribe ) saves from the corresponding topics (e.g. temperature and humidity, device status) to a database (SQLite 3)

• Python API mainly are the APIs which provide in JSON format to the measurements saved in the database

• WebApp React (publish/subscribe)

  • shows current values (temperature & humidity) directly from MQTT
  • shows in a diagram all measurements/values from an API
  • remote control of an electronic device (example fan connected to relay in arduino) and give the status of the device

Used Hardware

• Board Wemos D1 Mini ESP8266
• Sensor DHT11
• 5V Relay Songle

Main used it-tools

• MobX-State-Tree (State management)
• React
• FastAPI
• MQTT
• SQLite 3
• Material UI
• Chart.js

Commands to start services

# run python scripts
cd python
# install dependecies
python3 -m venv my_env
source my_env/bin/activate
pip install -r requirements.txt
python3 main_fastAPI.py
python3 mqtt_sub_save.py

# run the react web app
cd ../mqtt-react
npm install
npm start