motion detector sensor for humans as well as Robots(vacuum cleaner robot)

Other Hardware Sensors
1

Hi,

I'd like to attach a sensor, like a PIR sensor(HC-SR501), to detect movement inside a room. So all movement should be detected, Humans, animals etc as well as vacuum cleaner robots, RC cars etc.
Correct me if im wrong but i read now that PIR sensors wont detect robots since they won't radiate heat (or not enough heat).
I thought about Ultrasonic sensors but im not sure if they work well in observing a room(more likely to just detect the distance for a certain degree).
Has anyone else a recommendation what sensor i should try or what could work best with my setting.

Best regards,

Timm

2

Microwave motion sensors (caution: they work even through walls).

3

jremington:
Microwave motion sensors (caution: they work even through walls).

Hi, thanks a lots this looks promising.

4

It's microwave so keep it away from metal bits and it's ridiculously sensitive.

Also it's supposedly prone to false triggering on power supply glitches; I haven't seen it yet. A Pi filter with 2x 220µF caps plus 47 µH inductor (just for this sensor) seems to do the job quite well.

5

You can get 180 degree microwave sensors that you can attach to a wall or ceiling so that motion on the other side has no effect.

I use a pir in my kitchen to turn on/off the lights automatically (as well as part of an alarm system). My robot vacuum will trigger this at night and so the heat in the motors seems to be enough to be detected at several metres.

6

skywatch:
You can get 180 degree microwave sensors that you can attach to a wall or ceiling so that motion on the other side has no effect.

I use a pir in my kitchen to turn on/off the lights automatically (as well as part of an alarm system). My robot vacuum will trigger this at night and so the heat in the motors seems to be enough to be detected at several metres.

wvmarle:
It's microwave so keep it away from metal bits and it's ridiculously sensitive.

Also it's supposedly prone to false triggering on power supply glitches; I haven't seen it yet. A Pi filter with 2x 220µF caps plus 47 µH inductor (just for this sensor) seems to do the job quite well.

Thank you for your help and suggestions. I guess i might test both sensors and see which one works best.

Best regards,

Timm