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* e.g. to e.g., and proper case for Home Assistant * Instructions how to -> Instructions on how to
49 lines
2.0 KiB
Markdown
49 lines
2.0 KiB
Markdown
---
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layout: page
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title: "Min/max Sensor"
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description: "Instructions on how to integrate min/max sensors into Home Assistant."
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date: 2016-10-13 12:00
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sidebar: true
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comments: false
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sharing: true
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footer: true
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logo: home-assistant.png
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ha_category: Sensor
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ha_iot_class: "Local Polling"
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ha_release: "0.31"
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---
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The `min_max` sensor platform consumes the state from other sensors to determine the minimum, maximum, latest (last) and the mean of the collected states. The sensor will always show you the lowest/highest/latest value which was received from all monitored sensors. If you have spikes in your values, it's recommended to filter/equalize your values with a [statistics sensor](/components/sensor.statistics/) first.
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This sensor is an alternative to the [template sensor](/components/sensor.template/)'s `value_template:` to get the average of multiple sensors.
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```yaml
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{% raw %}{{ ((float(states.sensor.kitchen_temperature.state) +
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float(states.sensor.living_room_temperature.state) +
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float(states.sensor.office_temperature.state)) / 3) | round(2)
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}}{% endraw %}
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```
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Sensors with an unknown state will be ignored in the calculation. If the unit of measurement of the sensors differs, the `min_max` sensor will go to an error state where the value is `UNKNOWN` and unit of measurement is `ERR`.
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To enable the `min_max` sensor, add the following lines to your `configuration.yaml`:
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```yaml
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# Example configuration.yaml entry
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sensor:
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- platform: min_max
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entity_ids:
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- sensor.kitchen_temperature
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- sensor.living_room_temperature
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- sensor.office_temperature
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```
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Configuration variables:
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- **entity_ids** (*Required*): At least two entities to monitor. The unit of measurement of the first entry will be the one that's used. All entities must use the same unit of measurement.
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- **type** (*Optional*): The type of sensor: `min`, `max`, `last` or `mean`. Defaults to `max`.
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- **name** (*Optional*): Name of the sensor to use in the frontend.
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- **round_digits** (*Optional*): Round mean value to specified number of digits. Defaults to 2.
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