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battery powered ultrasound, human presence and distance detection

Other Parts Discussed in Thread: OPT3101

Hi Colleagues,

I'm looking for a sensor to identify human presence, for application on an alarm system, similar to a PIR, but using some sort of sonar/ultrasound technology, to obtain distance.

The device should be battery powered and sample at a 1Hz Rate.

Do we have anything able to meet such requirements?