An IR or Infrared sensor is an electronic instrument that is used to sense motion or any changes of its surroundings by either emitting or detecting infrared radiation. It can also measure heat of an object and detecting motion. Infrared waves are not visible to the human eye.
Radio-frequency identification (RFID) technology involves the use of electromagnetic or electrostatic coupling in the RF portion of the electromagnetic spectrum to uniquely identify an object, animal or person. It has established itself in a wide range of markets including livestock identification and automated vehicle identification because of its ability to track moving objects. The technology has also become a primary component of automated data collection, identification and analysis systems worldwide.