1. a device that detects or measures physical properties such as light, heat, motion, or pressure and converts them into signals

Examples

• The motion sensor automatically turns on the lights when someone enters the room.
• Temperature sensors monitor the engine to prevent overheating.
• The smoke sensor detected the fire and triggered the alarm.
• Modern cars have sensors that help with parking and collision avoidance.
• The security system uses infrared sensors to detect intruders.
• Light sensors adjust the screen brightness based on ambient conditions.