Presence detection is a cornerstone of home automation. Whether you want lights that automatically switch on when someone walks into a room, or smarter security alerts, presence sensors give your automations real-world context.
While PIR (motion) sensors are common, another interesting option is the photoelectric sensor. These sensors detect when an object breaks a light beam, making them great for detecting someone passing through a doorway, entering a hallway, or triggering an event when someAutomating irrigation is one of those home automation projects that’s both practical and fun.
Instead of manually turning sprinklers or valves on and off, you can control watering schedules through your smart home — or even trigger watering based on weather or soil moisture sensors.
In this series, I’ll walk through building a 4-zone irrigation controller using ESPHome, some off-the-shelf components, and Home Assistant integration.
Series Overview
As I publish parts of this series I will up 
