Easy IoT application with ESP32-Espressif

This is my Wireless Embedded System Design Mini Project (CE232 in UIT).

Design an IoT system have the below requirements

Model of project

ESP32 nodes task

• Collect temperature and humidity data from sensor.
• Show data on LCD.
• Send data to MQTT Broker every 10 seconds.

Server task

• Receive data from MQTT Broker.
• Save data to SQLite.
• Access from LAN.

End users (or web) task

• Show data in graph mode and web auto update without refresh.

How to operate this project

Activate or set up a virtual environment and install neccessary packet

• If you want to have an own virtual environment

$ python3 -m venv venv
$ source venv/bin/activate
$ python3 -m pip install -r requirements.txt

• Or you can use my virtual environment

$ source tutorial-env/bin/activate

Flash code to ESP32 and keep it powered up

• Change source code to fit your need.
• Go to esp32 source code folder and read README.md for more information.

Deploy Flask app

• Go to app folder

$ cd app

• Initialize database or you can change to fit your need in sql file before initialize.

$ python init_db.py

• Run Flask app

$ python app.py

• You can use http://127.0.0.1:5000 to access from your pc/laptop

• Or use http://192.168.0.128:5000 (this is my IP, replace with your) to access from your LAN device.

• If you want your Flask app can access over Internet, you can use ngrok.
• You can go to the ngrok home or Miguel Grinberg's blog guide for more information.
• By the way opening a parallel terminal and activate your virtual environment and run ngrok corresponding Flask app port.

$ source tutorial-env/bin/activate
$ ngrok http 5000

• You can use the Forwarding address to access from any network.

• You need to accept to visit the site

• The result

Demo