This is an extension of my project for Homemade Environment Sensor. The sensor is now expandable. I am creating a new thread to share on how I extend the sensor.
This week, I just got shipment for a motion sensor. There are a lot of discussion about PIR based motion sensor. I would like to share my experience with microwave radar based sensor. The product id is RCWL-0516. You can search it on Ebay or Aliexpress. They can be purchased for less than one dollar. Here is how it look like.
This kind of sensor typically have 360 degree coverage. It also does not need line of sight. This is could be an advantage for right application.
Here is a short demonstration.