arduino/mqtt-client-ESP32/esp32_DS18B20_temp_chart/README.md

ESP32 Temperature Monitoring and Web Application Project

This project consists of two main parts: an ESP32 device sending temperature data using MQTT and a Flask-based web application that displays this data.

Part 1: ESP32 Temperature Monitoring

Requirements

• ESP32 Development Board
• DS18B20 Temperature Sensor
• Arduino IDE with ESP32 support
• Wi-Fi connection

Configuration and Setup

1. Install the Arduino IDE: Download and install from Arduino website.

2. Add ESP32 Support in Arduino IDE: Follow the instructions here.

3. Install Required Libraries: In Arduino IDE, go to Sketch > Include Library > Manage Libraries... and install:

   • WiFi
   • PubSubClient
   • ArduinoJson
   • OneWire
   • DallasTemperature

4. Configure Wi-Fi and MQTT Settings: Modify the provided ESP32 code in Arduino IDE with your Wi-Fi and MQTT details.

5. Connect the DS18B20 Sensor to ESP32:

   • DS18B20 VCC to ESP32 3.3V
   • DS18B20 GND to ESP32 GND
   • DS18B20 Data to ESP32 GPIO 25

6. Upload the Code: Connect ESP32 to your computer, select the correct board and port in Arduino IDE, and upload.

Part 2: Flask Web Application

Requirements

• Python 3.8 or later
• Virtual environment tool (e.g., virtualenv)

Local Setup

1. Clone the Repository:

   git clone [Repository URL]
   cd [Repository Name]
   

2. Create a Virtual Environment:

   python -m venv venv
   source venv/bin/activate  # Windows: venv\Scripts\activate
   

3. Install Dependencies:

   pip install -r requirements.txt
   

4. Configure MQTT Settings in app.py: Modify MQTT configuration in app.py.

5. Run the Application:

   python app.py
   

   Access at http://localhost:8080.

Deploying to Fly.io

1. Install Fly.io CLI: Follow instructions on Fly.io documentation.

2. Login to Fly.io:

   flyctl auth login
   

3. Initialize Fly.io App:

   flyctl launch
   

4. Deploy the App:

   flyctl deploy
   

5. Verify Deployment:

   flyctl status