Is it possible to use a PIR sensor on a moving robot?

Question

I am developing a robot that can serve drinks, guard during the night, and possibly greet guests. I need it to be able to distinguish between human beings and inanimate objects, so I am planning on using a PIR sensor. But is it possible for a PIR sensor to be mounted on a MOVING robot? And what about the "warm-up" time? Are there PIR sensors out there that do not need a warm-up time?

What are these sensors called? And about the delay/"warm-up" time: when I searched robotics products on the internet, for example, here (http://www.parallax.com/detail.asp?product_id=555-28027) that PIR sensor needs a 10-60 second "warm-up" time as stated in the manual. I noticed that this is consistent with many PIR devices ((for example, alarm systems, like when you arm it, it beeps for a certain amout of time [30s or so], it is activating the PIR (motion) sensors)).

I'm not quite satisfied yet...Is there a specific name for these PIR (and just to make sure--> Passive Infrared) sensors that don't need a "warm-up" time? I have SPOKEN to someone who has used PIR sensors in a robotics project, and they say that they TRIED to use a PIR sensor they bought that was MEANT for robotics projects, but it WAS CONSTANTLY BEING TRIGGERED by the movement. To clarify, what am I going to need to use that 1) doen't need time to initiaize, and 2) will not be affected on a MOVING robot unless there is a human being standing in front of it.

Answer 1

Yes. I did the equivalent of that with a self guided robotic tow vehicle that needed to stop if someone crossed its path.

There are infrared sensors that have a well-defined pattern and are adjustable as to which of the several patterns (in vertical and horizontal directions) you wish to use to trigger their output.

They are not as cheap as the ones you find that turn on your bathroom light as soon as someone enters the toilet room.

Answer 2

A warm-up time is only required if you place the sensor into a new temperature environment (like from indoors to outdoors, or from a cold basement into a bedroom on the top floor), and also only if you make precise measurements using an infrared sensor.These are the (usually) 3 hour warm-ups.

But any IR sensor needs at least 3 minutes to "get used to" the surrounding which it will consider as "always there".

The movement worries me, though. I have IR sensors outdoors that already go off in heavy rain or snow.....
Or when I try to adjust the view angle slightly while its on.

Answer 3

PIR's are cheap little things that combined with a little chip (PIR Sensor Control IC) and possible a Fresnel Lens will tell you if there is motion in font of it. Especially that of a human body
https://www.robomart.com/robot-sensors

Answer 4

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