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This OV7725 USB CMOS board camera module is ideal for many applications such as security systems, portable video systems, video phones, industrial machine monitoring and toys. It uses high quality OmniVision image sensors. Although this camera is not designed as a consumer item, it remains a popular choice for equipment manufacturers, experimenters and hobbyists.

CdS photoresistor (also known as a light-dependent resistor, LDR, or photo-conductive cell) is a passive component that decreases resistance with respect to receiving luminosity (light) on the component's sensitive surface.

PIR sensor is a kind of sensor, also known as human body infrared sensor, used for life burglar alarm, visitor notification, etc., the principle is to release the charge through the amplifier into a voltage output