Is there a sensor that doesnt use passive infrared?
There is a Sensor available other than a passive infrared occupancy sensor.
Fortunately there is a occupancy sensor available in which uses dual technology. It uses ultrasonic motion detection as well as passive infrared detection. However, you can set the sensor to use ultrasonic motion detection ONLY. The part number for this sensor is 752/CD1RC.
Some of the key features are: