home-assistant.io/source/_components/sensor.min_max.markdown
Klaas Schoute a579ad2d1e Update Min_max sensor component configuration (#7132)
* Update Min_max sensor component configuration

* Add default
2018-10-28 13:03:33 +01:00

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---
layout: page
title: "Min/max Sensor"
description: "Instructions on how to integrate min/max sensors into Home Assistant."
date: 2016-10-13 12:00
sidebar: true
comments: false
sharing: true
footer: true
logo: home-assistant.png
ha_category: Utility
ha_iot_class: "Local Polling"
ha_release: "0.31"
ha_qa_scale: internal
---
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.
This sensor is an alternative to the [template sensor](/components/sensor.template/)'s `value_template:` to get the average of multiple sensors.
{% raw %}
```yaml
{{ ((float(states.sensor.kitchen_temperature.state) +
float(states.sensor.living_room_temperature.state) +
float(states.sensor.office_temperature.state)) / 3) | round(2)
}}
```
{% endraw %}
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`.
## {% linkable_title Configuration %}
To enable the `min_max` sensor, add the following lines to your `configuration.yaml`:
```yaml
# Example configuration.yaml entry
sensor:
- platform: min_max
entity_ids:
- sensor.kitchen_temperature
- sensor.living_room_temperature
- sensor.office_temperature
```
{% configuration %}
entity_ids:
description: 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.
required: true
type: [list, string]
type:
description: "The type of sensor: `min`, `max`, `last` or `mean`."
required: false
default: max
type: string
name:
description: Name of the sensor to use in the frontend.
required: false
type: string
round_digits:
description: Round mean value to specified number of digits.
required: false
type: integer
default: 2
{% endconfiguration %}