Modern houses often feature these ventilation ducts above windows, which are typically manually operated using a handle or lever to provide adequate home ventilation. By adding a linear actuator, an ESP8266, and some DIY magic, I’m now able to open and close the ducts within Home Assistant.
More details, Arduino code, wiring diagram, bill of materials, and a 3D model for the coupler can be found in our blog Intelligent Airflow: A Guide to Making Your Window Ventilation Smart