enviroplus-mqtt

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enviroplus-mqtt

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A Python service for logging environmental data over MQTT

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# Enviro+ MQTT Logger

`enviroplus-mqtt` is a Python service that publishes environmental data from an [Enviro+](https://shop.pimoroni.com/products/enviro-plus) via MQTT.

## Setting Up Your Device

1) Set up your RPi as you normally would.
2) Connect the Enviro+ board, and the PMS5003 sensor if you are using one.
3) Install the Enviro+ library by following the instructions at https://github.com/pimoroni/enviroplus-python/ (make sure the library is installed for Python 3)
4) Clone this repository to `/usr/src/enviroplus-mqtt`:

sudo git clone https://github.com/hotplot/enviroplus-mqtt /usr/src/enviroplus-mqtt

5) Add a new file at `/etc/systemd/system/envlogger.service` with the following content:

[Unit]
       Description=Enviro+ MQTT Logger
       After=network.target
   
       [Service]
       ExecStart=/usr/bin/python3 /usr/src/enviroplus-mqtt/src/main.py <arguments>
       WorkingDirectory=/usr/src/enviroplus-mqtt
       StandardOutput=inherit
       StandardError=inherit
       Restart=always
       User=pi
   
       [Install]
       WantedBy=multi-user.target
       
   **Note that you must replace `<arguments>` with flags appropriate to your MQTT server.**

6) Enable and start the service:

sudo systemctl enable envlogger.service
       sudo systemctl start envlogger.service

## Supported Arguments

- The MQTT host, port, username, password and client ID can be specified.
- The update interval can be specified, and defaults to 5 seconds.
- The initial delay before publishing readings can be specified, and defaults to 15 seconds.
- If you are using a PMS5003 sensor, enable it by passing the `--use-pms5003` flag.

usage: main.py -h HOST [-p PORT] [-U USERNAME] [-P PASSWORD] [--prefix PREFIX]
                    [--client-id CLIENT_ID] [--interval INTERVAL] [--delay DELAY]
                    [--use-pms5003] [--help]

optional arguments:
        -h HOST, --host HOST  the MQTT host to connect to
        -p PORT, --port PORT  the port on the MQTT host to connect to
        -U USERNAME, --username USERNAME
                            the MQTT username to connect with
        -P PASSWORD, --password PASSWORD
                            the password to connect with
        --prefix PREFIX       the topic prefix to use when publishing readings, i.e.
                            'lounge/enviroplus'
        --client-id CLIENT_ID
                            the MQTT client identifier to use when connecting
        --interval INTERVAL   the duration in seconds between updates
        --delay DELAY         the duration in seconds to allow the sensors to
                            stabilise before starting to publish readings
        --use-pms5003         if set, PM readings will be taken from the PMS5003
                            sensor
        --help                print this help message and exit

## Published Topics

Readings will be published to the following topics:

- `<prefix>/proximity`
- `<prefix>/lux`
- `<prefix>/temperature`
- `<prefix>/pressure`
- `<prefix>/humidity`
- `<prefix>/gas/oxidising`
- `<prefix>/gas/reducing`
- `<prefix>/gas/nh3`
- `<prefix>/particulate/1.0`
- `<prefix>/particulate/2.5`
- `<prefix>/particulate/10.0`

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