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+---
+layout: page
+title: "Filter Sensor"
+description: "Instructions how to integrate Data Filter Sensors into Home Assistant."
+date: 2018-02-20
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Sensor
+ha_release: 0.65
+ha_iot_class: "Local Push"
+logo: home-assistant.png
+---
+
+The `filter` platform enables sensors that process the states of other entities.
+
+`filter` applies a signal processing algorithm to a sensor, previous and current states, and generates a `new state` given the chosen algorithm.
+
+<p class='img'>
+  <img src='{{site_root}}/images/screenshots/filter-sensor.png' />
+</p>
+
+To enable Filter Sensors in your installation, add the following to your `configuration.yaml` file:
+
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: filter
+    name: "filtered realistic humidity"
+    entity_id: sensor.realistic_humidity
+    filters:
+      - filter: outlier
+        window_size: 4
+        radius: 4.0
+      - filter: lowpass
+        time_constant: 10
+        precision: 2
+```
+
+Filters can be chained and are applied according to the order present in the configuration file.
+
+{% configuration %}
+entity_id:
+  description: The entity ID of the sensor to be filtered.
+  required: true
+  type: string
+name:
+  description: Name to use in the frontend.
+  required: false
+  type: string
+filters:
+  description: Filters to be used.
+  required: true 
+  type: map
+  keys:
+    filter:
+      description: Algorithm to be used to filter data. Available filters are `lowpass`, `outlier` and `throttle`.
+      required: true
+      type: string
+    window_size:
+      description: Size of the window of previous states.
+      required: false
+      type: int
+      default: 5  
+    precision:
+      description: See [_lowpass_](#low-pass) filter. Defines the precision of the filtered state, through the argument of round().
+      required: false
+      type: int
+      default: None
+    time_constant: 
+      description: See [_lowpass_](#low-pass) filter. Loosely relates to the amount of time it takes for a state to influence the output.
+      required: false
+      type: int
+      default: 10
+    radius: 
+      description: See [_outlier_](#outlier) filter. Band radius from median of previous states.
+      required: false
+      type: float
+      default: 2.0 
+{% endconfiguration %}
+
+## {% linkable_title Filters %}
+
+### {% linkable_title Low-pass %}
+
+The Low-pass filter (`lowpass`) is one of signal processing most common filters, as it smooths data by shortcuting peaks and valleys.
+
+The included Low-pass filter is very basic and is based on a moving average, in which the previous data point is weighted with the new data point.
+
+```python
+B = 1.0 / time_constant
+A = 1.0 - B
+LowPass(state) = A * previous_state + B * state
+```
+
+The returned value is rounded to the number of decimals defined in (`precision`).
+
+### {% linkable_title Outlier %}
+
+The Outlier filter (`outlier`) is a basic Band-stop filter, as it cuts out any value outside a specific range.
+
+The included Outlier filter will discard any value beyond a band centered on the median of the previous values, replacing it with the median value of the previous values. If inside the band, the 
+
+```python
+distance = abs(state - median(previous_states))
+
+if distance > radius:
+    median(previous_states)
+else:
+    state
+```
+
+### {% linkable_title Throttle %}
+
+The Throttle filter (`throttle`) will only update the state of the sensor for the first state in the window. This means the filter will skip all other values.
+
+To adjust the rate you need to set the window_size. To throttle a sensor down to 10%, the `window_size` should be set to 10, for 50% should be set to 2.
+
+This filter is relevant when you have a sensor which produces states at a very high-rate, which you might want to throttle down for storing or visualization purposes. 
+
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