RPI System sensors

I’ve created a simple python script that runs every 60 seconds and sends several system data over MQTT. It uses the MQTT Discovery for Home Assistant so you don’t need to configure anything in Home Assistant if you have discovery enabled for MQTT

It currently logs the following data:

• CPU usage
• CPU temperature
• Disk usage
• Memory usage
• Power status of the RPI
• Last boot
• Swap usage
• Wifi signal strength
• Amount of upgrades pending
• Disk usage of external drives

Installation:

1. Clone this repo
2. cd system_sensors
3. pip3 install -r requirements.txt
4. apt-get install python3-apt
5. Edit settings.yaml to reflect your setup:

Value	Required	Default	Description
hostname	true	\	Hostname of the MQTT broker
port	false	1883	Port of the MQTT broker
user	false	\	The userlogin( if defined) for the MQTT broker
password	false	\	the password ( if defined) for the MQTT broker
deviceName	true	\	device name is sent with topic
client_id	true	\	client id to connect to the MQTT broker
timezone	true	\	Your local timezone (you can find the list of timezones here: time zones)
power_integer_state	false	false	Return the power state in text or integer form
update_interval	false	60	The update interval to send new values to the MQTT broker
check_available_updates	false	false	Check the # of avaiblable updates
check_wifi_strength	false	false	Check the wifi strength
external_drives	false	\	Declare external drives you want to check disk usage of (see example settings.yaml)

6. python3 system_sensors.py /path/to/settings.yaml
7. (optional) create service to autostart the script at boot:
   1. sudo nano /etc/systemd/system/system_sensor.service
   2. copy following script:

   [Unit]
   Description=System Sensor service
   After=multi-user.target
   
   [Service]
   User=[user]
   Type=idle
   ExecStart=/usr/bin/python3 /home/pi/sensors/system_sensors.py /path/to/settings.yaml
   
   [Install]
   WantedBy=multi-user.target

   3. edit the path to your script path and settings.yaml. Also make sure you replace [user] with the account from which this script will be run. This is typically 'pi' on default raspbian system.
   4. sudo systemctl enable system_sensor.service
   5. sudo systemctl start system_sensor.service

Home Assistant configuration:

Configuration:

The only config you need in Home Assistant is the following:

mqtt:
  discovery: true
  discovery_prefix: homeassistant

Lovelace UI example:

I have used following custom plugins for lovelace:

• vertical-stack-in-card
• mini-graph-card
• bar-card

Config:

- type: 'custom:vertical-stack-in-card'
    title: Deconz System Monitor
    cards:
      - type: horizontal-stack
        cards:
          - type: custom:mini-graph-card
            entities:
              - sensor.deconzcpuusage
            name: CPU
            line_color: '#2980b9'
            line_width: 2
            hours_to_show: 24
          - type: custom:mini-graph-card
            entities:
              - sensor.deconztemperature
            name: Temp
            line_color: '#2980b9'
            line_width: 2
            hours_to_show: 24
      - type: custom:bar-card
        entity: sensor.deconzdiskuse
        title: HDD
        title_position: inside
        align: split
        show_icon: true
        color: '#00ba6a'
      - type: custom:bar-card
        entity: sensor.deconzmemoryuse
        title: RAM
        title_position: inside
        align: split
        show_icon: true
      - type: entities
        entities:
          - sensor.deconzlastboot
          - sensor.deconzpowerstatus

Example: