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arduino/mqtt-client-ESP32/esp32_DS18B20_temp_chart/esp32/README.md

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ESP32 Temperature Monitoring Project

This project involves an ESP32 device using MQTT to send temperature data. The ESP32 is configured with a DS18B20 temperature sensor and connects to an MQTT broker.

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 the Arduino IDE from Arduino website.

  2. Add ESP32 Support in Arduino IDE: Follow the instructions here to add ESP32 board support to the Arduino IDE.

  3. Install Required Libraries: Open the Arduino IDE, go to Sketch > Include Library > Manage Libraries.... Install the following libraries:

    • WiFi
    • PubSubClient
    • ArduinoJson
    • OneWire
    • DallasTemperature

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

    const char* wifi_ssid = "your_wifi_ssid";
const char* wifi_password = "your_wifi_password";
const char* mqtt_broker = "your_mqtt_broker";
const char* mqtt_username = "your_mqtt_username";
const char* mqtt_password = "your_mqtt_password";

  5. Connect the DS18B20 Sensor to ESP32: Connect the DS18B20 sensor to your ESP32:

    • DS18B20 VCC to ESP32 3.3V
    • DS18B20 GND to ESP32 GND
    • DS18B20 Data to ESP32 GPIO 25 (or change one_wire_bus in the code if using a different pin)

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

  7. Monitor the Temperature Data: Once the code is uploaded, the ESP32 will start sending temperature data to the MQTT broker.