home-assistant.io/source/_components/sensor.min_max.markdown

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layout	title	description	date	sidebar	comments	sharing	footer	logo	ha_category	ha_iot_class	ha_release
page	Min/max Sensor	Instructions how to integrate min/max sensors into Home Assistant.	2016-10-13 12:00	true	false	true	true	home-assistant.png	Sensor	Local Polling	0.31

The min_max sensor platform is consuming the state from other sensors and determine the minimum, maximum, and the mean of the collected states. The sensor will always show you the highest/lowest value which was received from your all monitored sensors. If you have spikes in your values, it's recommended filter/equalize your values with a statistics sensor first.

It's an alternative to the template sensor's value_template: to get the average of multiple sensors.

{% raw %}{{ ((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 the unit of measurement is ERR.

To enable the minimum/maximum sensor, add the following lines to your configuration.yaml:

# Example configuration.yaml entry
sensor:
  - platform: min_max
    entity_ids:
      - sensor.kitchen_temperature
      - sensor.living_room_temperature
      - sensor.office_temperature

Configuration variables:

• 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.
• type (Optional): The type of sensor: min, max or mean. Defaults to max.
• name (Optional): Name of the sensor to use in the frontend.
• round_digits (Optional): Round mean value to specified number of digits. Defaults to 2.