BME680 values publishing with MQTT

Features

Sends values from the BME680 using MQTT simple client

• temperature
• humidity
• pressure
• gas
• altitude

Usage

Tested with a RasperryPi Pico W and a BME680 Pimoroni Sensor.

To use the MQTT client:

1. flash your Pi
2. copy all files including

• the certificates needed, key, cert and CA in PEM format
• the main.py, mqtt_connect.py, bme680.py files
• the config.json file with the right values
• the lib folder

Configuration

The configuration in the config.json file is as follows:

{
    "mqtt": {
        "broker": "<broker address>",
        "topic": "<topic name>",
        "cert_key": "<path to cert key>",
        "cert_pem": "<path to certificate>",
        "cert_ca": "<path to CA cert>",
        "wifi_ssid": "<ssid of wifi to use>",
        "wifi_password": "<password of wifi to use>"
    }
}

Dependencies

• Uses micropython implementation of bme680 https://github.com/robert-hh/BME680-Micropython
• Packages mqtt simple in the lib folder, that you can copy on your Pi Pico