A Deeper Look

Triggers & Conditions:

The blueprint uses both a state change from not_home to home for your PC tracker and a motion sensor activation. A numeric state condition ensures that the automation only runs when ambient lighting (from your illuminance sensor) is below the defined threshold (default 37 lux). This minimizes unnecessary operations when the area is already well lit.

Light Brightness Based on Sun:

Using the built-in sun condition, the automation distinguishes between a day period (starting 30 minutes after sunrise) and a night period (adjusted using offset around sunset). This means your light’s brightness is automatically tailored to the natural light context, setting it to the day brightness (default 81%) or to the night brightness (default 69%).

Handling PC Presence & Motion:

Two branches further refine the control:

If the PC is not_home, the blueprint waits until motion ceases before turning off the light.

If the PC is home and ambient light remains low, the light is ensured to remain on until the PC changes to not_home, at which point the light turns off with a smooth transition and a flash effect.

This 

design

 is ideal for scenarios where a PC’s presence and environmental conditions are combined to manage indoor illumination dynamically.

Xiaomi Aqara motion sensor RTCGQ11LM 

www.zigbee2mqtt.io/devices/RTCGQ11LM.html

TRADFRI bulb E27 white opal 1000lm

Xiaomi Mijia Thermo-/Hygrometer 

Bluetooth

 LYWSD03MMC flash 

http://pvvx.github.io/ATC\_MiThermometer

Blueprint 

https://gist.github.com/tido-/e486e7504081a1cfdcd837afba43ebf4

My forum post 

https://community.home-assistant.io/t/nmap-to-detect-running-tower-pc/888689

Radiation of radio transmission

Heart rate using the WiFi signal 

https://hackaday.com/2025/09/05/heart-rate-monitoring-via-wifi/

www.consumerreports.org/radiation/do-i-need-to-worry-about-radiation-from-wifi-and-bluetooth-devices/

www.elektrosmog.com

www.gigaherz.ch