I am trying to build an arduino project with the following requirements:
- Proximity sensors detect human presence and its distance
- The sensors are hidden behind fabric
- Range has to be 1-3 meters or higher
- It is for indoor use
After a bit of trial and errors, here are my initial conclusions:
Available light changes, and sensors being behind the fabric, photo sensors are out of the question
Even though they're not supposed to be very sensitive to soft material, Ultrasonic sensors such as the HC-SR04 don't fit. Their echo bounce right off the fabric
Pir Motion sensors don't read through fabric either
I am starting to wonder if this is even feasible. Is there such thing as a proximity sensor that reads through soft material?