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An infrared (IR) sensor is an electronic component that detects infrared radiation (heat) to measure distance, detect motion, or identify objects. It works by emitting and receiving back IR signals to recognize the reflections. It is often used in security systems, robotics (obstacle avoidance), and automatic controls such as TV remote controls. These sensors consist of a transmitter (IR LED) and a receiver (photodiode/phototransistor), with two main types: active (emits its own signal) and pass