PIR Sensor (Passive Infrared) is used as an electronic device to measure the infrared light radiating from objects or human bodies nearby and detect whether a human has moved in or out of the sensor range

Radio Frequency (RF) signal refers to a wireless electromagnetic signal act as a form of communication. Wireless technology allows two or more devices communicate wirelessly, without any physical link connected

The principle of active RFID tags require to use own power source (a battery) and a transmitter to broadcast the information to the interrogator.

Pressure sensor pad is an electronic device that capture physical force contact to generate a response. When a person approached or left a sensor pad, it will generate an action.