Motion Sensors turns motion into an electric signal, when it is detected. They can be used in many different ways to make your property more secure, turn lights on and off automatically, open and close automatic doors, and so on. Sensors used in the motion detector can be microwave, passive infrared sensors (PIR) or ultrasonic. Residential motion sensors are typically built using PIR (Passive Infrared) technology. Passive infrared sensors are calibrated to detect differences in temperature, for example between a person and a tree. Feature functions that are pet immune which is pet ignoring option; they can ignore pets that weigh up to 40 lbs or 80 lbs.
Timers are generally digital or electromechanical. They can be used to control the sequence of an event or process such as: Lamps, air-conditioning systems, swimming pools, and many other things. Modern controllers use a programmable logic controller rather than a box full of electromechanical parts.