Key Takeaways Infrared IR waves are part of the electromagnetic spectrum crucial for various applications by detecting thermal energy emitted by objects IR sensors can be classified as active emitting ...
As the fan blades spin they disrupt the beam of infrared light between the emitter and ... You won’t be limited to an IR sensor, but can use a hall effect sensor in the same basic fashion.
(Passive InfraRed sensor) A device used to detect motion by ... sensors that either bounce back a radar signal or transmit light to a photodetector in the distance. See network camera.