Method for narrow motion detection (hack PIR?)?

Using Arduino Project Guidance
1

Hi,

I am looking for an advice on how to solve this, which technical solution would be the most appropriate.

I would like to detect (hand) motion on three adjacent areas. It need to be quite responsive. Only data needed is yes/no. It should work in daylight.

Could PIRs be hacked to only detect a small area? Or is ultrasonic detectors better? But optimally I would like it to work through a window. Or is laser/light sensor?

The simpler solution the better. :slight_smile:

Thanks!

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brodbord:
Could PIRs be hacked to only detect a small area?

Easily. Just "blinker" it.

brodbord:
Or is ultrasonic detectors better?

Generally a very narrow range, especially at short distance - and this would only be over a short distance, within about 2 metres.

brodbord:
But optimally I would like it to work through a window.

That then excludes PIR and ultrasonics.

brodbord:
Or is laser/ light sensor?

Possible. A camera on a Raspberry Pi for motion detection.