Optimizing Ventilation with CO2 Sensors and Automation

General
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Hey everyone, I wanted to share my recent experience optimizing my home’s ventilation system using a CO2 sensor and Home Assistant automation. It’s been a fascinating project that has significantly improved the air quality in my bedroom!

I have a ventilation system with three speed settings, controlled via Home Assistant. I also have a CO2 sensor that I wanted to integrate into the system. The goal was to automate the ventilation based on CO2 levels: below 700 ppm, the fan runs at speed 1; between 700 and 1000 ppm, it goes to speed 2; and above 1000 ppm, it switches to speed 3.

The challenge arose when I wanted to ensure that manual overrides via physical switches would still work seamlessly. Initially, I was concerned that the automation might conflict with manual inputs. After some research and experimentation, I found a solution by using a combination of state tracking and conditional logic in the automation rules.

Here’s how I set it up:

  1. CO2 Sensor Integration: I configured the CO2 sensor to update its readings every minute. This ensures that the system reacts quickly to changes in air quality.
  2. Automation Logic: I created three separate automations for each CO2 threshold. Each automation checks the current state of the ventilation system to avoid conflicts with manual inputs.
  3. Manual Override Handling: By tracking the state of the physical switches, I ensured that manual overrides would take precedence over the automated system. This was achieved by adding a condition in the automation that checks if the system is in a ‘manual’ state before executing the automated speed change.

The result has been fantastic! The system now automatically adjusts the ventilation based on CO2 levels while still allowing manual control when needed. It’s been especially useful during the night when CO2 levels can rise without me noticing.

I’d love to hear how others have integrated sensors and automation into their homes. Have you tried something similar or have any tips for improving air quality monitoring? Let’s discuss!

Cheers,
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