Smoothed Sensor (Home Assistant Integration)

Overview

smoothed_sensor is a custom Home Assistant integration that creates a smoothed version of an existing sensor using exponential moving average (EMA).

This is useful when:

• The original sensor is noisy or updates irregularly.
• You want a time-weighted mean that reflects a decayed average rather than instantaneous values.
• You need a smoother input for automations or PID controllers.

The integration exposes:

• Smoothed Sensor → the calculated EMA value.
• Source Value Sensor → the raw source reading used in the most recent calculation (for debugging/monitoring).

Features

• UI-based setup (no YAML required).
• Adjustable decay time (in minutes) to tune how quickly the EMA responds to changes.
• Works with any numeric sensor.
• Friendly unique IDs so sensors survive restarts and renaming.
• Ready for HACS auto-updates.

Installation

HACS (recommended)

1. Go to HACS → Integrations → Custom Repositories.
2. Add this repository:
   https://github.com/PascalGodin/ha-smoothed-sensor with category: Integration.
3. Search for and install Smoothed Sensor.
4. Restart Home Assistant.

Manual

1. Copy the custom_components/smoothed_sensor folder into your Home Assistant custom_components directory.
2. Restart Home Assistant.

Configuration

1. In Home Assistant, go to Settings → Devices & Services → Add Integration.
2. Search for Smoothed Sensor.
3. Select:

• Source sensor → the entity you want to smooth.
• Decay time (minutes) → how quickly past values decay in importance.

4. Done! A new sensor will be created with the smoothed values.

Example

If you have a noisy temperature sensor that spikes with every update:

• Raw sensor: sensor.outdoor_temp
• Smoothed sensor: sensor.outdoor_temp_smoothed

This smoothed version can then be used in automations, dashboards, or PID controllers.

Notes

• A decay time of 10 minutes means old values halve in influence every ~10 minutes.
• If you change the decay time in the UI, the integration will recalculate automatically.
• The source value sensor is available for debugging but optional to use.

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Development

Issues and PRs welcome!

• Repo: ha-smoothed-sensor
• License: MIT