Let's Make Robots!

PIR (Passive Infrared Sensor)


Vendor's Description: 


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, as it is reacting on Infra Red.

You can not use a PIR for anything but on something that stands still, to detect something else that moves.

No, you cannot use a PIR to make a robot follow you. The PIR only detects changes. A moving robot (even turning it's head) would be one constant "alarm" of "changes" - not possible to tell what is what.

If you want to make a robot follow you, you either have to use a camera and some serious calculations, or something like the devantech Thermopile array sensors or hack an Infrared thermometer (often refered to as a Laser thermometer asthey often come with a guiding laser-beam).. or something else :D

PIR's can only detect changes! A moving robot will detect changes all the time! 

 

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Sounds like these would be great for doing a robot guard dog that just sits and waits for someone to break in and then activates itself, powers on the chainsaw and starts to chase to burglar (using some other form of tracking)!