forked from sthope/battery2mqtt
82 lines
3.9 KiB
Markdown
82 lines
3.9 KiB
Markdown
# battery2mqtt
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*Push information about batteries in your system to MQTT*
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I thought of this project when I switched to using my old laptop as my Home Assistant server. I wanted to track its battery level in Home Assistant to use in automations. I'm very new to Python, so I'm sure there's room for improvement here.
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# Summary
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`battery2mqtt` can monitor current battery percentage, charging status, etc. for any batteries present at `/sys/class/power_supply`. The MQTT topic format is `battery2mqtt/$TOPIC/$NAME` where `$TOPIC` is the topic you define and `$NAME` is the name of each battery. For example, if `/sys/class/power_supply/BAT0` is present in your system and you choose `server` to be the topic, the full topic will be `battery2mqtt/server/BAT0`.
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# Instructions
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**Option 1: Pull from Docker Hub**
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`docker pull tediore/battery2mqtt:latest` (https://hub.docker.com/r/tediore/battery2mqtt)
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**Option 2: Manual build**
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1. Clone repo: `git clone https://github.com/Tediore/battery2mqtt`
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2. Enter directory: `cd battery2mqtt`
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3. Build image: `docker build . -t battery2mqtt`
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4. Customize `docker-compose.yaml` to fit your needs
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5. `docker-compose up -d`
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Example compose file with all possible environmental variables listed:
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```yaml
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version: '3'
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services:
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battery2mqtt:
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container_name: battery2mqtt
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image: battery2mqtt:latest
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environment:
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- MQTT_HOST=10.0.0.2
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- MQTT_PORT=1883
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- MQTT_USER=user
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- MQTT_PASSWORD=password
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- MQTT_TOPIC=server
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- MQTT_QOS=1
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- INTERVAL=60
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- MONITORED_CONDITIONS=status,capacity
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- BATTERY_HEALTH=1
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- TIME_REMAINING=1
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- SHOW_UNITS=1
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volumes:
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- /sys/class/power_supply:/sys/class/power_supply:ro
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restart: unless-stopped
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```
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# Configuration
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| Variable | Default | Description |
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|----------|---------|-------------|
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| `MQTT_HOST` | `None` | IP address or hostname of the MQTT broker to connect to. |
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| `MQTT_PORT` | `1883` | The port the MQTT broker is bound to. |
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| `MQTT_USER` | `None` | The user to send to the MQTT broker. |
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| `MQTT_PASSWORD` | `None` | The password to send to the MQTT broker. |
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| `MQTT_TOPIC` | `server` | The topic to send the payload to. |
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| `MQTT_QOS` | `1` | The MQTT QoS level. |
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| `INTERVAL` | `60` | How often (in seconds) battery2mqtt polls for battery info. |
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| `MONITORED_CONDITIONS` | (See below) | Battery properties to send to MQTT (must be a comma-separated string.) |
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| `BATTERY_HEALTH` | `1` | Set to 1 to enable battery health percentage calculation or 0 to disable. |
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| `TIME_REMAINING` | `1` | Set to 1 to enable time remaining estimate (in hours) or 0 to disable. |
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| `SHOW_UNITS` | `1` | Set to 1 to show power units in the MQTT payload or 0 to disable. |
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# Monitored conditions
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You can specify only those conditions that you'd like to track. The default is to track `status, capacity, energy_now, energy_full, energy_full_design, power_now, voltage_now`. You can add more conditions (found at `/sys/class/power_supply/$NAME`) or choose only those you want to track. The variable in your `docker-compose.yaml` must follow this comma-separated format:
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```
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status,capacity,energy_now,energy_full,energy_full_design,power_now,voltage_now
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```
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# Battery health and time remaining calculations
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The default is to also provide a battery health percentage calculation by dividing `energy_full` by `energy_full_design`. This can be disabled by setting `BATTERY_HEALTH` to `0` in your `docker-compose.yaml`.
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Similiarly, an estimate of time remaining on battery (in hours) is calculated by dividing `energy_now` by `power_now`. This can be disabled by setting `TIME_REMAINING` to `0` in your `docker-compose.yaml`.
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# Example Home Assistant configuration
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```yaml
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sensor:
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- platform: mqtt
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name: Server battery
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state_topic: &battery_topic "battery2mqtt/server/BAT0"
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value_template: "{{ value_json.capacity }}"
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unit_of_measurement: '%'
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icon: 'mdi:battery'
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json_attributes_topic: *battery_topic
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```
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